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meropenem injection, powder, for solution
----------Meropenem For Injection, USP (I.V.)
FOR INTRAVENOUS USE ONLY
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Meropenem for Injection I.V. and other antibacterial drugs, Meropenem for Injection I.V. should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.
Meropenem for Injection I.V. is a sterile, pyrogen-free, synthetic, broad-spectrum, carbapenem antibiotic for intravenous administration. It is (4R,5S,6S)-3-[[(3S,5S)-5-(Dimethylcarbamoyl)-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid trihydrate. Its molecular formula is C17 H25 N3 O5 S•3H2 O with a molecular weight of 437.52. Its structural formula is:
Meropenem for Injection I.V. is a white to pale yellow crystalline powder. The solution varies from colorless to yellow depending on the concentration. The pH of freshly constituted solutions is between 7.3 and 8.3. Meropenem is soluble in 5% monobasic potassium phosphate solution, sparingly soluble in water, very slightly soluble in hydrated ethanol, and practically insoluble in acetone or ether.
When constituted as instructed (see DOSAGE AND ADMINISTRATION; PREPARATION OF SOLUTION), each 500 mg Meropenem for Injection I.V. vial will deliver 500 mg meropenem and 45.1 mg of sodium as sodium carbonate (1.96 mEq). Each 1 g Meropenem for Injection I.V. vial will deliver 1 g of meropenem and 90.2 mg of sodium as sodium carbonate (3.92 mEq).
At the end of a 30 minute intravenous infusion of a single dose of Meropenem for Injection I.V. in normal volunteers, mean peak plasma concentrations are approximately 23 mcg/mL (range 14 to 26) for the 500 mg dose and 49 mcg/mL (range 39 to 58) for the 1 g dose. A 5 minute intravenous bolus injection of Meropenem for Injection I.V. in normal volunteers results in mean peak plasma concentrations of approximately 45 mcg/mL (range 18 to 65) for the 500 mg dose and 112 mcg/mL (range 83 to 140) for the 1 g dose.
Following intravenous doses of 500 mg, mean plasma concentrations of meropenem usually decline to approximately 1 mcg/mL at 6 hours after administration.
In subjects with normal renal function, the elimination half-life of Meropenem for Injection I.V. is approximately 1 hour. Approximately 70% of the intravenously administered dose is recovered as unchanged meropenem in the urine over 12 hours, after which little further urinary excretion is detectable. Urinary concentrations of meropenem in excess of 10 mcg/mL are maintained for up to 5 hours after a 500 mg dose. No accumulation of meropenem in plasma or urine was observed with regimens using 500 mg administered every 8 hours or 1 g administered every 6 hours in volunteers with normal renal function.
Plasma protein binding of meropenem is approximately 2%.
There is one metabolite that is microbiologically inactive.
Meropenem penetrates well into most body fluids and tissues including cerebrospinal fluid, achieving concentrations matching or exceeding those required to inhibit most susceptible bacteria. After a single intravenous dose of Meropenem for Injection I.V., the highest mean concentrations of meropenem were found in tissues and fluids at 1 hour (0.5 to 1.5 hours) after the start of infusion, except where indicated in the tissues and fluids listed in the table below.
Table 1. Meropenem Concentrations in Selected Tissues (Highest Concentrations Reported)
The pharmacokinetics of Meropenem for Injection I.V. in pediatric patients 2 years of age or older are essentially similar to those in adults. The elimination half-life for meropenem was approximately 1.5 hours in pediatric patients of age 3 months to 2 years. The pharmacokinetics are linear over the dose range from 10 to 40 mg/kg.
Pharmacokinetic studies with Meropenem for Injection I.V. in patients with renal insufficiency have shown that the plasma clearance of meropenem correlates with creatinine clearance. Dosage adjustments are necessary in subjects with renal impairment. (See DOSAGE AND ADMINISTRATION - Use in Adults with Renal Impairment.) A pharmacokinetic study with Meropenem for Injection I.V. in elderly patients with renal insufficiency has shown a reduction in plasma clearance of meropenem that correlates with age-associated reduction in creatinine clearance.
Meropenem I.V. is hemodialyzable. However, there is no information on the usefulness of hemodialysis to treat overdosage. (See OVERDOSAGE.)
A pharmacokinetic study with Meropenem for Injection I.V. in patients with hepatic impairment has shown no effects of liver disease on the pharmacokinetics of meropenem.
Meropenem is a broad-spectrum carbapenem antibiotic. It is active against Gram-positive and Gram-negative bacteria.
The bactericidal activity of meropenem results from the inhibition of cell wall synthesis. Meropenem readily penetrates the cell wall of most Gram-positive and Gram-negative bacteria to reach penicillin-binding-protein (PBP) targets. Its strongest affinities are toward PBPs 2, 3 and 4 of Escherichia coli and Pseudomonas aeruginosa; and PBPs 1, 2 and 4 of Staphylococcus aureus. Bactericidal concentrations (defined as a 3 log10 reduction in cell counts within 12 to 24 hours) are typically 1 to 2 times the bacteriostatic concentrations of meropenem, with the exception of Listeria monocytogenes, against which lethal activity is not observed.
Meropenem has significant stability to hydrolysis by β-lactamases of most categories, both penicillinases and cephalosporinases produced by Gram-positive and Gram-negative bacteria.
Meropenem should not be used to treat methicillin-resistant staphylococci (MRSA).
In vitro tests show meropenem to act synergistically with aminoglycoside antibiotics against some isolates of Pseudomonas aeruginosa.
Mechanism of Action
Meropenem exerts its action by penetrating bacterial cells readily and interfering with the synthesis of vital cell wall components, which leads to cell death.
Mechanism of Resistance
There are several mechanisms of resistance to carbapenems: 1) decreased permeability of the outer membrane of Gram-negative bacteria (due to diminished production of porins) causing reduced bacterial uptake, 2) reduced affinity of the target penicillin binding proteins (PBP), 3) increased expression of efflux pump components, and 4) production of antibiotic-destroying enzymes (carbapenemases, metallo-β-lactamases).
Aerobic and facultative Gram-positive microorganisms
Enterococcus faecalis (excluding vancomycin-resistant isolates)
Staphylococcus aureus (β-lactamase and non-β-lactamase producing, methicillin-susceptible isolates only)
Streptococcus pneumoniae (penicillin-susceptible isolates only)
NOTE: Penicillin-resistant isolates had meropenem MIC90 values of 1 or 2 mcg/mL, which is above the 0.12 mcg/mL susceptible breakpoint for this species.
Viridans group streptococci
Aerobic and facultative Gram-negative microorganisms
Haemophilus influenzae (β-lactamase and non-β-lactamase producing)
The following in vitro data are available, but their clinical significance is unknown.
At least 90% of the following microorganisms exhibit an in vitro minimum inhibitory concentration (MIC) less than or equal to the susceptible breakpoints for meropenem. However, the safety and effectiveness of meropenem in treating clinical infections due to these microorganisms have not been established in adequate and well-controlled trials.
Aerobic and facultative Gram-positive microorganisms
Staphylococcus epidermidis (β-lactamase and non-β-lactamase-producing, methicillin-susceptible isolates only).
Aerobic and facultative Gram-negative microorganisms
SUSCEPTIBILITY TEST METHODS
When available, the clinical microbiology laboratory should provide cumulative results of in vitro susceptibility test results for antimicrobial drugs used in local hospitals and practice areas to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting the most effective antimicrobial.
Quantitative methods are used to determine antimicrobial minimum inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized procedure. Standardized procedures are based on a dilution method12 (broth or agar) or equivalent with standardized inoculum concentrations and standardized concentrations of meropenem powder. The MIC values should be interpreted according to the criteria provided in Table 2.
Quantitative methods that require measurement of zone diameters also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. One such standardized procedure34 requires the use of standardized inoculum concentrations. This procedure uses paper disks impregnated with 10 mcg of meropenem to test the susceptibility of microorganisms to meropenem. The disk diffusion interpretive criteria are provided in Table 2.
Streptococcus pneumoniae isolates should be tested using 1 mcg/mL oxacillin disk. Isolates with oxacillin zone sizes of ≥ 20 mm are susceptible (MIC ≤ 0.06 mcg/mL) to penicillin and can be considered susceptible to meropenem for approved indications, and meropenem need not be tested. A meropenem MIC should be determined on isolates of S. pneumoniae with oxacillin zone sizes of ≤19 mm. The disk test does not distinguish penicillin intermediate isolates (i.e., MICs = 0.12 to 1 mcg/mL) from isolates that are penicillin resistant (i.e., MICs ≥ 2 mcg/mL). Viridans group streptococci should be tested for meropenem susceptibility using an MIC method. Reliable disk diffusion tests for meropenem do not yet exist for testing streptococci.
For anaerobic bacteria, the susceptibility to meropenem as MICs can be determined by standardized test method5s. The MIC values obtained should be interpreted according to the criteria provided in Table 2.
Table 2. Susceptibility Interpretive Criteria for Meropenem
No interpretative criteria have been established for testing enterococci and Neisseria meningitidis.
A report of Susceptible indicates that the antimicrobial is likely to inhibit growth of the pathogen if the antimicrobial compound in the blood reaches the concentrations usually achievable. A report of Intermediate indicates that the result should be considered equivocal, and, if the microorganism is not fully susceptible to alternative, clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated or in situations where a high dosage of drug can be used. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of Resistant indicates that the antimicrobial is not likely to inhibit growth of the pathogen if the antimicrobial compound in the blood reaches the concentrations usually achievable; other therapy should be selected.
Standardized susceptibility test procedures require the use of quality control microorganisms to control the technical aspects of the test procedures. Standard meropenem powder should provide the following range of values noted in Table 3.
Table 3. Acceptable Quality Control Ranges for Meropenem
INDICATIONS AND USAGE
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Meropenem for Injection I.V. and other antibacterial drugs, Meropenem for Injection I.V. should only be used to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.
Meropenem for Injection I.V. is indicated as single agent therapy for the treatment of the following infections when caused by susceptible isolates of the designated microorganisms:
Skin and Skin Structure Infections
Complicated skin and skin structure infections due to Staphylococcus aureus (β-lactamase and non-β-lactamase producing, methicillin susceptible isolates only), Streptococcus pyogenes, Streptococcus agalactiae, viridans group streptococci, Enterococcus faecalis (excluding vancomycin-resistant isolates), Pseudomonas aeruginosa, Escherichia coli, Proteus mirabilis, Bacteroides fragilis, and Peptostreptococcus species.
Complicated appendicitis and peritonitis caused by viridans group streptococci, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Bacteroides fragilis, B. thetaiotaomicron, and Peptostreptococcus species.
Bacterial Meningitis (Pediatric patients ≥ 3 months only)
Bacterial meningitis caused by Streptococcus pneumoniae6, Haemophilus influenzae (β-lactamase and non-β-lactamase-producing isolates), and Neisseria meningitidis.
Meropenem for Injection I.V. has been found to be effective in eliminating concurrent bacteremia in association with bacterial meningitis.
Appropriate cultures should usually be performed before initiating antimicrobial treatment in order to isolate and identify the organisms causing infection and determine their susceptibility to Meropenem for Injection I.V.
Meropenem for Injection I.V. is useful as presumptive therapy in the indicated condition (i.e., intra-abdominal infections) prior to the identification of the causative organisms because of its broad spectrum of bactericidal activity.
Antimicrobial therapy should be adjusted, if appropriate, once the results of culture(s) and antimicrobial susceptibility testing are known.
Meropenem for Injection I.V. is contraindicated in patients with known hypersensitivity to any component of this product or to other drugs in the same class or in patients who have demonstrated anaphylactic reactions to β-lactams.
SERIOUS AND OCCASIONALLY FATAL HYPERSENSITIVITY (ANAPHYLACTIC) REACTIONS HAVE BEEN REPORTED IN PATIENTS RECEIVING THERAPY WITH β-LACTAMS. THESE REACTIONS ARE MORE LIKELY TO OCCUR IN INDIVIDUALS WITH A HISTORY OF SENSITIVITY TO MULTIPLE ALLERGENS.
THERE HAVE BEEN REPORTS OF INDIVIDUALS WITH A HISTORY OF PENICILLIN HYPERSENSITIVITY WHO HAVE EXPERIENCED SEVERE HYPERSENSITIVITY REACTIONS WHEN TREATED WITH ANOTHER β-LACTAM. BEFORE INITIATING THERAPY WITH MEROPENEM FOR INJECTION I.V., CAREFUL INQUIRY SHOULD BE MADE CONCERNING PREVIOUS HYPERSENSITIVITY REACTIONS TO PENICILLINS, CEPHALOSPORINS, OTHER β-LACTAMS, AND OTHER ALLERGENS. IF AN ALLERGIC REACTION TO MEROPENEM FOR INJECTION I.V. OCCURS, DISCONTINUE THE DRUG IMMEDIATELY. SERIOUS ANAPHYLACTIC REACTIONS REQUIRE IMMEDIATE EMERGENCY TREATMENT WITH EPINEPHRINE, OXYGEN, INTRAVENOUS STEROIDS, AND AIRWAY MANAGEMENT, INCLUDING INTUBATION. OTHER THERAPY MAY ALSO BE ADMINISTERED AS INDICATED.
Carbapenems, including meropenem, may reduce serum valproic acid concentrations to subtherapeutic levels, resulting in loss of seizure control. Serum valproic acid concentrations should be monitored frequently after initiating carbapenem therapy. Alternative antibacterial or anticonvulsant therapy should be considered if serum valproic acid concentrations drop below the therapeutic range or a seizure occurs. (see Drug Interactions.)
Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Meropenem for Injection I.V., and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.
C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.
If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.
Prescribing Meropenem for Injection I.V. in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.
Seizures and other adverse CNS experiences have been reported during treatment with Meropenem for Injection I.V. These experiences have occurred most commonly in patients with CNS disorders (e.g., brain lesions or history of seizures) or with bacterial meningitis and/or compromised renal function.
During clinical investigations, 2904 immunocompetent adult patients were treated for non-CNS infections, with the overall seizure rate being 0.7% (based on 20 patients with this adverse event). All meropenem-treated patients with seizures had pre-existing contributing factors. Among these are included prior history of seizures or CNS abnormality and concomitant medications with seizure potential. Dosage adjustment is recommended in patients with advanced age and/or reduced renal function. (See DOSAGE AND ADMINISTRATION - Use in Adults with Renal Impairment.)
Close adherence to the recommended dosage regimens is urged, especially in patients with known factors that predispose to convulsive activity. Anticonvulsant therapy should be continued in patients with known seizure disorders. If focal tremors, myoclonus, or seizures occur, patients should be evaluated neurologically, placed on anticonvulsant therapy if not already instituted, and the dosage of Meropenem for Injection I.V. re-examined to determine whether it should be decreased or the antibiotic discontinued.
In patients with renal dysfunction, thrombocytopenia has been observed but no clinical bleeding reported. (See DOSAGE AND ADMINISTRATION - Use in Adults with Renal Impairment.)
There is inadequate information regarding the use of Meropenem for Injection I.V. in patients on hemodialysis.
As with other broad-spectrum antibiotics, prolonged use of meropenem may result in overgrowth of nonsusceptible organisms. Repeated evaluation of the patient is essential. If superinfection does occur during therapy, appropriate measures should be taken.
While Meropenem for Injection I.V. possesses the characteristic low toxicity of the beta-lactam group of antibiotics, periodic assessment of organ system functions, including renal, hepatic, and hematopoietic, is advisable during prolonged therapy.
Probenecid competes with meropenem for active tubular secretion and thus inhibits the renal excretion of meropenem. This led to statistically significant increases in the elimination half-life (38%) and in the extent of systemic exposure (56%). Therefore, the coadministration of probenecid with meropenem is not recommended.
A clinically significant reduction in serum valproic acid concentration has been reported in patients receiving carbapenem antibiotics and may result in loss of seizure control. Although the mechanism of this interaction is not fully understood, data from in vitro and animal studies suggest that carbapenem antibiotics may inhibit valproic acid glucuronide hydrolysis. Serum valproic acid concentrations should be monitored frequently after initiating carbapenem therapy. Alternative antibacterial or anticonvulsant therapy should be considered if serum valproic acid concentrations drop below the therapeutic range or a seizure occurs. (see WARNINGS.)
Carcinogenesis, Mutagenesis, Impairment of Fertility
Genetic toxicity studies were performed with meropenem using the bacterial reverse mutation test, the Chinese hamster ovary HGPRT assay, cultured human lymphocytes cytogenic assay, and the mouse micronucleus test. There was no evidence of mutagenic potential found in any of these tests.
Impairment of fertility
Reproductive studies were performed with meropenem in rats at doses up to 1000 mg/kg/day, and cynomolgus monkeys at doses up to 360 mg/kg/day (on the basis of AUC comparisons, approximately 1.8 times and 3.7 times, respectively, to the human exposure at the usual dose of 1 g every 8 hours). There was no reproductive toxicity seen.
Pregnancy Category B
Reproductive studies have been performed with meropenem in rats at doses of up to 1000 mg/kg/day, and cynomolgus monkeys at doses of up to 360 mg/kg/day (on the basis of AUC comparisons, approximately 1.8 times and 3.7 times, respectively, to the human exposure at the usual dose of 1 g every 8 hours). These studies revealed no evidence of impaired fertility or harm to the fetus due to meropenem, although there were slight changes in fetal body weight at doses of 250 mg/kg/day (on the basis of AUC comparisons, 0.4 times the human exposure at a dose of 1 g every 8 hours) and above in rats. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
The safety and effectiveness of Meropenem for Injection I.V. have been established for pediatric patients ≥ 3 months of age. Use of Meropenem for Injection I.V. in pediatric patients with bacterial meningitis is supported by evidence from adequate and well-controlled studies in the pediatric population. Use of Meropenem for Injection I.V. in pediatric patients with intra-abdominal infections is supported by evidence from adequate and well-controlled studies with adults with additional data from pediatric pharmacokinetics studies and controlled clinical trials in pediatric patients. Use of Meropenem for Injection I.V. in pediatric patients with complicated skin and skin structure infections is supported by evidence from an adequate and well-controlled study with adults and additional data from pediatric pharmacokinetics studies. ( See CLINICAL PHARMACOLOGY, INDICATIONS AND USAGE, ADVERSE REACTIONS, DOSAGE AND ADMINISTRATION, and CLINICAL STUDIES sections.)
It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Meropenem for Injection I.V. is administered to a nursing woman.
Of the total number of subjects in clinical studies of Meropenem for Injection I.V., approximately 1100 (30%) were 65 years of age and older, while 400 (11%) were 75 years and older. Additionally, in a study of 511 patients with complicated skin and skin structure infections 93 (18%) were 65 years of age and older, while 38 (7%) were 75 years and older. No overall differences in safety or effectiveness were observed between these subjects and younger subjects; spontaneous reports and other reported clinical experience have not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
A pharmacokinetic study with Meropenem for Injection I.V. in elderly patients with renal insufficiency has shown a reduction in plasma clearance of meropenem that correlates with age-associated reduction in creatinine clearance. (See DOSAGE AND ADMINISTRATION; Use in Adults with Renal Impairment.)
Meropenem for Injection I.V. is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.
Information For Patients
Patients should be counseled that antibacterial drugs including Meropenem for Injection I.V. should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Meropenem for Injection I.V. is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Meropenem for Injection I.V. or other antibacterial drugs in the future.
Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.
During clinical investigations, 2904 immunocompetent adult patients were treated for non-CNS infections with Meropenem for Injection I.V. (500 mg or 1000 mg q 8 hours). Deaths in 5 patients were assessed as possibly related to meropenem; 36 (1.2%) patients had meropenem discontinued because of adverse events. Many patients in these trials were severely ill and had multiple background diseases, physiological impairments and were receiving multiple other drug therapies. In the seriously ill patient population, it was not possible to determine the relationship between observed adverse events and therapy with Meropenem for Injection I.V.
The following adverse reaction frequencies were derived from the clinical trials in the 2904 patients treated with Meropenem for Injection I.V.
Local Adverse Reactions
Local adverse reactions that were reported irrespective of the relationship to therapy with Meropenem for Injection I.V. were as follows:
Systemic Adverse Reactions
Systemic adverse clinical reactions that were reported irrespective of the relationship to Meropenem for Injection I.V. occurring in greater than 1% of the patients were diarrhea (4.8%), nausea/vomiting (3.6%), headache (2.3%), rash (1.9%), sepsis (1.6%), constipation (1.4%), apnea (1.3%), shock (1.2%), and pruritus (1.2%).
Additional adverse systemic clinical reactions that were reported irrespective of relationship to therapy with Meropenem for Injection I.V. and occurring in less than or equal to 1% but greater than 0.1% of the patients are listed below within each body system in order of decreasing frequency:
Bleeding events were seen as follows: gastrointestinal hemorrhage (0.5%), melena (0.3%), epistaxis (0.2%), hemoperitoneum (0.2%), summing to 1.2%.
Body as a Whole: pain, abdominal pain, chest pain, fever, back pain, abdominal enlargement, chills, pelvic pain.
Cardiovascular: heart failure, heart arrest, tachycardia, hypertension, myocardial infarction, pulmonary embolus, bradycardia, hypotension, syncope
Digestive System: oral moniliasis, anorexia, cholestatic jaundice/jaundice, flatulence, ileus, hepatic failure, dyspepsia, intestinal obstruction
Hemic/Lymphatic: anemia, hypochromic anemia, hypervolemia
Metabolic/Nutritional: peripheral edema, hypoxia
Nervous System: insomnia, agitation/delirium, confusion, dizziness, seizure (see PRECAUTIONS), nervousness, paresthesia, hallucinations, somnolence, anxiety, depression, asthenia
Respiratory: respiratory disorder, dyspnea, pleural effusion, asthma, cough increased, lung edema
Skin and Appendages: urticaria, sweating, skin ulcer
Urogenital System : dysuria, kidney failure, vaginal moniliasis, urinary incontinence
Adverse Laboratory Changes
Adverse laboratory changes that were reported irrespective of relationship to Meropenem for Injection I.V. and occurring in greater than 0.2% of the patients were as follows:
Hepatic: increased SGPT (ALT), SGOT (AST), alkaline phosphatase, LDH, and bilirubin
Hematologic: increased platelets, increased eosinophils, decreased platelets, decreased hemoglobin, decreased hematocrit, decreased WBC, shortened prothrombin time and shortened partial thromboplastin time, leukocytosis, hypokalemia
Renal: increased creatinine and increased BUN
NOTE: For patients with varying degrees of renal impairment, the incidence of heart failure, kidney failure, seizure and shock reported irrespective of relationship to Meropenem for Injection I.V., increased in patients with moderately severe renal impairment (creatinine clearance >10 to 26 mL/min).
Urinalysis: presence of red blood cells
Complicated Skin and Skin Structure Infection
In a study of complicated skin and skin structure infection, the type of clinical adverse reactions were similar to those listed above. The patients with the most common adverse events with an incidence of >5% were: headache (7.8%), nausea (7.8%), constipation (7%), diarrhea (7%), anemia (5.5%), and pain (5.1%). Adverse events with an incidence of >1%, and not listed above, include: pharyngitis, accidental injury, gastrointestinal disorder, hypoglycemia, peripheral vascular disorder, and pneumonia.
Clinical Adverse Reactions
Meropenem for Injection I.V. was studied in 515 pediatric patients (≥ 3 months to < 13 years of age) with serious bacterial infections (excluding meningitis. See next section.) at dosages of 10 to 20 mg/kg every 8 hours. The types of clinical adverse events seen in these patients are similar to the adults, with the most common adverse events reported as possibly, probably or definitely related to Meropenem for Injection I.V. and their rates of occurrence as follows:
Meropenem for Injection I.V. was studied in 321 pediatric patients (≥ 3 months to < 17 years of age) with meningitis at a dosage of 40 mg/kg every 8 hours. The types of clinical adverse events seen in these patients are similar to the adults, with the most common adverse events reported as possibly, probably, or definitely related to Meropenem for Injection I.V. and their rates of occurrence as follows:
In the meningitis studies the rates of seizure activity during therapy were comparable between patients with no CNS abnormalities who received meropenem and those who received comparator agents (either cefotaxime or ceftriaxone). In the Meropenem for Injection I.V. treated group, 12/15 patients with seizures had late onset seizures (defined as occurring on day 3 or later) versus 7/20 in the comparator arm.
Worldwide post-marketing adverse events not otherwise listed in the product label and reported as possibly, probably, or definitely drug related are listed within each body system in order of decreasing severity. Hematologic - agranulocytosis, neutropenia, and leukopenia ; a positive direct or indirect Coombs test, and hemolytic anemia. Skin – toxic epidermal necrolysis, Stevens-Johnson Syndrome, angioedema, and erythema multiform.
To report SUSPECTED ADVERSE EVENTS, contact FDA at 1-800-FDA-1088 or www.fda.gov.
In mice and rats, large intravenous doses of meropenem (2200 to 4000 mg/kg) have been associated with ataxia, dyspnea, convulsions, and mortalities.
Intentional overdosing of Meropenem for Injection I.V. is unlikely, although accidental overdosing might occur if large doses are given to patients with reduced renal function. The largest dose of meropenem administered in clinical trials has been 2 g given intravenously every 8 hours. At this dosage, no adverse pharmacological effects or increased safety risks have been observed.
Limited post-marketing experience indicates that if adverse events occur following overdosage, they are consistent with the adverse event profile described in the Adverse Reactions section and are generally mild in severity and resolve on withdrawal or dose reduction. Symptomatic treatments should be considered. In individuals with normal renal function, rapid renal elimination takes place. Meropenem and its metabolite are readily dialyzable and effectively removed by hemodialysis; however, no information is available on the use of hemodialysis to treat overdosage.
Skin and Skin Structure
Adult patients with complicated skin and skin structure infections including complicated cellulitis, complex abscesses, perirectal abscesses, and skin infections requiring intravenous antimicrobials, hospitalization, and surgical intervention were enrolled in a randomized, multi-center, international, double-blind trial. The study evaluated meropenem at doses of 500 mg administered intravenously every 8 hours and imipenem-cilastatin at doses of 500 mg administered intravenously every 8 hours. The study compared the clinical response between treatment groups in the clinically evaluable population at the follow-up visit (test-of-cure). The trial was conducted in the United States, South Africa, Canada, and Brazil. At enrollment, approximately 37% of the patients had underlying diabetes, 12% had underlying peripheral vascular disease and 67% had a surgical intervention. The study included 510 patients randomized to meropenem and 527 patients randomized to imipenem-cilastatin. Two hundred and sixty-one (261) patients randomized to meropenem and 287 patients randomized to imipenem-cilastatin were clinically evaluable. The success rates in the clinically evaluable patients at the follow-up visit were 86% (225/261) in the meropenem arm and 83% (238/287) in imipenem-cilastatin arm.
The following table provides the results for the overall as well as subgroup comparisons in clinically evaluable population.
The following clinical efficacy rates were obtained, per organism. The values represent the number of patients clinically cured/number of clinically evaluable patients at the post-treatment follow-up visit, with the percent cure in parentheses (Fully Evaluable analysis set)
The proportion of patients who discontinued study treatment due to an adverse event was similar for both treatment groups. (meropenem, 2.5% and imipenem-cilastatin, 2.7%).
One controlled clinical study of complicated intra-abdominal infection was performed in the United States where meropenem was compared with clindamycin/tobramycin. Three controlled clinical studies of complicated intra-abdominal infections were performed in Europe; meropenem was compared with imipenem (two trials) and cefotaxime/metronidazole (one trial).
Using strict evaluability criteria and microbiologic eradication and clinical cures at follow-up which occurred 7 or more days after completion of therapy, the following presumptive microbiologic eradication/clinical cure rates and statistical findings were obtained:
The finding that meropenem was not statistically equivalent to cefotaxime/metronidazole may have been due to uneven assignment of more seriously ill patients to the meropenem arm. Currently there is no additional information available to further interpret this observation.
Four hundred forty-six patients (397 pediatric patients ≥ 3 months to < 17 years of age) were enrolled in 4 separate clinical trials and randomized to treatment with meropenem (n=225) at a dose of 40 mg/kg q 8 hours or a comparator drug, i.e., cefotaxime (n=187) or ceftriaxone (n=34), at the approved dosing regimens. A comparable number of patients were found to be clinically evaluable (ranging from 61 to 68%) and with a similar distribution of pathogens isolated on initial CSF culture.
Patients were defined as clinically not cured if any one of the following three criteria were met:
Using the definition, the following efficacy rates were obtained, per organism. The values represent the number of patients clinically cured/number of clinically evaluable patients, with the percent cure in parentheses.
Sequelae were the most common reason patients were assessed as clinically not cured.
Five patients were found to be bacteriologically not cured, 3 in the comparator group (1 relapse and 2 patients with cerebral abscesses) and 2 in the meropenem group (1 relapse and 1 with continued growth of Pseudomonas aeruginosa).
The adverse events seen were comparable between the two treatment groups both in type and frequency. The meropenem group did have a statistically higher number of patients with transient elevation of liver enzymes. (See ADVERSE REACTIONS). Rates of seizure activity during therapy were comparable between patients with no CNS abnormalities who received meropenem and those who received comparator agents. In the Meropenem for Injection I.V. treated group, 12/15 patients with seizures had late onset seizures (defined as occurring on day 3 or later) versus 7/20 in the comparator arm.
With respect to hearing loss, 263 of the 271 evaluable patients had at least one hearing test performed post-therapy. The following table shows the degree of hearing loss between the meropenem-treated patients and the comparator-treated patients.
DOSAGE AND ADMINISTRATION
The recommended dose of Meropenem for Injection I.V. is 500 mg given every 8 hours for skin and skin structure infections and 1 g given every 8 hours for intra-abdominal infections. Meropenem for Injection I.V. should be administered by intravenous infusion over approximately 15 to 30 minutes. Doses of 1 g may also be administered as an intravenous bolus injection (5 to 20 mL) over approximately 3 to 5 minutes.
Use in Adults with Renal Impairment
Dosage should be reduced in patients with creatinine clearance less than 51 mL/min. (see dosing table below).
Recommended Meropenem for Injection I.V. Dosage Schedule for Adults With Impaired Renal Function
When only serum creatinine is available, the following formula (Cockcroft and Gault equation) 7 may be used to estimate creatinine clearance.
Males: Creatinine Clearance (mL/min) = Weight (kg) x (140 - age)
72 x serum creatinine (mg/dL)
Females: 0.85 x above value
There is inadequate information regarding the use of Meropenem for Injection I.V. in patients on hemodialysis.
There is no experience with peritoneal dialysis.
Use in Adults With Hepatic Insufficiency
No dosage adjustment is necessary in patients with impaired hepatic function.
Use in Elderly Patients
No dosage adjustment is required for elderly patients with creatinine clearance values above 50 mL/min.
Use in Pediatric Patients
For pediatric patients from 3 months of age and older, the Meropenem for Injection I.V. dose is 10, 20 or 40 mg/kg every 8 hours (maximum dose is 2 g every 8 hours), depending on the type of infection (complicated skin and skin structure, intra-abdominal or meningitis). (See dosing table below.) Pediatric patients weighing over 50 kg should be administered Meropenem for Injection I.V. at a dose of 500 mg every 8 hours for complicated skin and skin structure infections, 1 g every 8 hours for intra-abdominal infections and 2 g every 8 hours for meningitis. Meropenem for Injection I.V. should be given as intravenous infusion over approximately 15 to 30 minutes or as an intravenous bolus injection (5 to 20 mL) over approximately 3 to 5 minutes.
Recommended Meropenem for Injection I.V. Dosage Schedule for Pediatrics With Normal Renal Function
There is no experience in pediatric patients with renal impairment.
PREPARATION OF SOLUTION
For Intravenous Bolus Administration
Constitute injection vials (500 mg and 1g) with sterile Water for Injection. (See table below.) Shake to dissolve and let stand until clear.
Infusion vials (500 mg and 1g) may be directly constituted with a compatible infusion fluid (See COMPATIBILITY AND STABILITY.) Alternatively, an injection vial may be constituted, then the resulting solution added to an I.V. container and further diluted with an appropriate infusion fluid. (See COMPATIBILITY AND STABILITY.)
WARNING: Do not use flexible container in series connections.
COMPATIBILITY AND STABILITY
Compatibility of Meropenem with other drugs has not been established. Meropenem should not be mixed with or physically added to solutions containing other drugs.
Freshly prepared solutions of Meropenem should be used whenever possible. However, constituted solutions of Meropenem maintain satisfactory potency at controlled room temperature 15 to 25ºC (59 to 77°F) or under refrigeration at 4°C (39°F) as described below. Solutions of intravenous Meropenem should not be frozen.
Intravenous Bolus Administration
Meropenem for Injection I.V. injection vials constituted with sterile Water for Injection for bolus administration (up to 50 mg/mL of Meropenem) may be stored for up to 2 hours at controlled room temperature 15 to 25°C (59 to 77°F) or for up to 12 hours at 4°C (39°F).
Intravenous Infusion Administration
Stability in Infusion vials
Meropenem for Injection I.V. infusion vials constituted with Sodium Chloride Injection 0.9% (Meropenem concentrations ranging from 2.5 to 50 mg/mL) are stable for up to 2 hours at controlled room temperature 15 to 25°C (59 to 77°F) or for up to 18 hours at 4°C (39°F). Infusion vials of Meropenem for Injection I.V. constituted with Dextrose Injection 5% (Meropenem concentrations ranging from 2.5 to 50 mg/mL) are stable for up to 1 hour at controlled room temperature 15 to 25°C (59 to 77°F) or for up to 8 hours at 4°C (39°F).
Stability in Plastic I.V. Bags
Solutions prepared for infusion (Meropenem concentrations ranging from 1 to 20 mg/mL) may be stored in plastic intravenous bags with diluents as shown below:
Stability in Baxter Minibag Plus® (manufactured by Baxter, Inc.)
Solutions of Meropenem (Meropenem concentrations ranging from 2.5 to 20 mg/mL) in Baxter Minibag Plus® (manufactured by Baxter, Inc.) bags with Sodium Chloride Injection 0.9% may be stored for up to 4 hours at controlled room temperatures 15 to 25°C (59 to 77°F) or for up to 24 hours at 4°C (39°F). Solutions of Meropenem (Meropenem concentrations ranging from 2.5 to 20 mg/mL) in Baxter Minibag Plus® (manufactured by Baxter, Inc.) bags with Dextrose Injection 5% may be stored up to 1 hour at controlled room temperatures 15 to 25°C (59 to 77°F) or for up to 6 hours at 4°C (39°F).
Stability in Plastic Syringes, Tubing and Intravenous Infusion Sets
Solutions of Meropenem (Meropenem concentrations ranging from 1 to 20 mg/mL) in Water for Injection or Sodium Chloride Injection 0.9% (for up to 4 hours) or in Dextrose Injection 5% (for up to 2 hours) at controlled room temperatures 15 to 25°C (59 to 77°F) are stable in plastic tubing and volume control devices of common intravenous infusion sets.
Solutions of Meropenem (Meropenem concentrations ranging from 1 to 20 mg/mL) in Water for Injection or Sodium Chloride Injection 0.9% (for up to 48 hours) or in Dextrose Injection 5% (for up to 6 hours) are stable at 4ºC (39ºF) in plastic syringes.
NOTE: Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.
Meropenem for Injection I.V. is supplied in 20 mL and 30 mL injection vials containing sufficient meropenem to deliver 500 mg or 1 g for intravenous administration, respectively. The dry powder should be stored at 20 to 25ºC (68 to 77ºF). [See USP Controlled Room Temperature.]
500 mg Injection Vial (NDC 0409-3505-01), 25 vials per carton.
1 g Injection Vial (NDC 0409-3506-01), 25 vials per carton.
Revised: June, 2010
Manufactured by Hospira Healthcare India Pvt. Ltd.
Irungattukottai - 602 105, India for Hospira, Inc.,
Lake Forest, IL 60045, USA.
Made in India
PACKAGE LABEL.PRINCIPAL DISPLAY PANEL
500 mg Vial Label
For Injection, USP (I.V.)
For Intravenous Use Only
Contents are Sterile
1 gram Vial Label
For Injection, USP (I.V.)
For Intravenous Use Only
Contents are Sterile
500 mg Carton
25 x 500 mg sterile vials
For Injection, USP (I.V.)
For Intravenous Use Only
1 gram Carton
25 x 1 g sterile vials
For Injection, USP (I.V.)
For Intravenous Use Only
Revised: 04/2010 Hospira, Inc.
Reproduced with permission of U.S. National Library of Medicine
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