Invanz

Ertapenem.

INVANZ is supplied as a sterile lyophilized powder for intravenous infusion or intramuscular injection containing ertapenem 1 g as a free acid.

Therapeutic Class: INVANZ (Ertapenem for Injection) is a sterile, synthetic, long-acting, parenteral, 1-β methyl-carbapenem that is structurally related to beta-lactam antibiotics, such as penicillins and cephalosporins, with activity against a wide range of gram-positive and gram-negative aerobic and anaerobic bacteria.
Pharmacology: Mechanism of Action: Ertapenem has in vitro activity against a wide range of gram positive and gram-negative aerobic and anaerobic bacteria. The bactericidal activity of ertapenem results from the inhibition of cell wall synthesis and is mediated through ertapenem binding to penicillin binding proteins (PBPs). In Escherichia coli, it has strong affinity toward PBPs 1a, 1b, 2, 3, 4 and 5 with preference for PBPs 2 and 3. Ertapenem has significant stability to hydrolysis by most classes of beta-lactamases, including penicillinases, and cephalosporinases and extended spectrum beta-lactamases, but not metallo-beta-lactamases.
Pharmacokinetics: Absorption: Ertapenem, reconstituted with 1% lidocaine HCl injection (in saline without epinephrine), is well absorbed following IM administration at the recommended dose of 1 g. The mean bioavailability is approximately 92%. Following 1 g daily IM administration, mean peak plasma concentrations (C_max) are reached in approximately 2 hrs (T_max).
Distribution: Ertapenem is highly bound to human plasma proteins. In healthy young adults, the protein-binding of ertapenem decreases as plasma concentrations increase, from approximately 95% bound at an approximate plasma concentration of <100 mcg/mL to approximately 85% bound at an approximate plasma concentration of 300 mcg/mL.
Average plasma concentrations (mcg/mL) of ertapenem following a single 30 minute IV infusion of a 1 or 2 g dose and IM administration of a single 1 g dose in healthy young adults are presented in Table 1.

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Area under the plasma concentration curve (AUC) of ertapenem in adults increases nearly dose-proportionally over the 0.5 to 2 g dose range.
There is no accumulation of ertapenem following multiple IV doses ranging from 0.5 to 2 g daily or IM doses of 1 g daily.
Average plasma concentrations (mcg/mL) of ertapenem in pediatric patients are presented in Table 2.

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The volume of distribution (V_dss) of ertapenem in adults is approximately 8 liters (0.11 liter/kg) and approximately 0.2 liter/kg in pediatric patients 3 months to 12 years of age and approximately 0.16 liter/kg in pediatric patients 13 to 17 years of age.
Ertapenem penetrates into suction-induced skin blisters. Concentrations of ertapenem achieved in skin blister fluid at each sampling point on the third day of 1 g once daily IV doses are presented in Table 3. The ratio of AUC in skin blister fluid to AUC in plasma is 0.61. (See Table 3.)

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The level of ertapenem in breast milk of 5 lactating women was measured at random time points daily for 5 consecutive days following the last 1 g dose of intravenous therapy. The measured concentration of ertapenem in breast milk on the last day of therapy (5 to 14 days postpartum) in all 5 women was <0.38 mcg/mL; peak concentrations were not assessed. By day 5 after discontinuation of therapy, the level of ertapenem was undetectable in the breast milk of 4 women and was detected at trace levels (<0.13 mcg/mL) in 1 woman.
In vitro studies indicate that ertapenem does not inhibit P-glycoprotein-mediated transport of digoxin or vinblastine and that ertapenem is not a substrate for P-glycoprotein-mediated transport (see INTERACTIONS).
Metabolism: In healthy young adults, after IV infusion of radiolabeled 1 g ertapenem, the plasma radioactivity consists predominantly (94%) of ertapenem. The major metabolite of ertapenem is the ring-opened derivative formed by hydrolysis of the beta-lactam ring.
In vitro studies in human liver microsomes indicate that ertapenem does not inhibit metabolism mediated by any of the six major cytochrome p450 (CYP) isoforms: 1A2, 2C9, 2C19, 2D6, 2E1 and 3A4 (see INTERACTIONS).
Elimination: Ertapenem is eliminated primarily by the kidneys. The mean plasma half-life in healthy young adults and patients 13 to 17 years of age is approximately 4 hrs and approximately 2.5 hrs in pediatric patients 3 months to 12 years of age.
Following administration of a 1 g radiolabeled IV dose of ertapenem to healthy young adults, approximately 80% is recovered in urine and 10% in feces. Of the 80% recovered in urine, approximately 38% is excreted as unchanged drug and approximately 37% as the ring-opened metabolite.
In healthy young adults given a 1 g IV dose, average concentrations of ertapenem in urine exceed 984 mcg/mL during the period 0 to 2 hours postdose and exceed 52 mcg/mL during the period 12 to 24 hours postdose.
Microbiology: Ertapenem has in vitro activity against a wide range of gram-positive and gram-negative aerobic and anaerobic bacteria. The bactericidal activity of ertapenem results from the inhibition of cell wall synthesis and is mediated through ertapenem binding to penicillin binding proteins (PBPs). In Escherichia coli, it has strong affinity toward PBPs 1a, 1b, 2, 3, 4 and 5 with preference for PBPs 2 and 3. Ertapenem has significant stability to hydrolysis by most classes of beta-lactamases, including penicillinases, and cephalosporinases and extended spectrum beta-lactamases, but not metallo-beta-lactamases.
INVANZ has been shown to be active against most strains of the following microorganisms in vitro and in clinical infections (see INDICATIONS): AEROBIC AND FACULTATIVE ANAEROBIC GRAM-POSITIVE MICROORGANISMS: Staphylococcus aureus (including penicillinase-producing strains), Streptococcus agalactiae, Streptococcus pneumoniae and Streptococcus pyogenes.
Note: Methicillin-resistant staphylococci are resistant to INVANZ. Many strains of Enterococcus faecalis and most strains of Enterococcus faecium are resistant.
AEROBIC AND FACULTATIVE ANAEROBIC GRAM-NEGATIVE MICROORGANISMS: Escherichia coli, Haemophilus influenzae (including beta-lactamase producing strains), Klebsiella pneumoniae, Moraxella catarrhalis and Proteus mirabilis.
ANAEROBIC MICROORGANISMS: Bacteroides fragilis and other species in the B. fragilis Group, Clostridium sp (excluding C. difficile), Eubacterium species, Peptostreptococcus species, Porphyromonas asaccharolytica and Prevotella species.
The following in vitro data are available, but their clinical significance is unknown.
INVANZ exhibits in vitro minimum inhibitory concentrations (MICs) of ≤1 mcg/mL against most (≥90%) strains of Streptococcus species including Streptococcus pneumoniae, ≤0.5 mcg/mL against most (≥90%) strains of Haemophilus species, ≤2 mcg/mL against most (≥90%) strains of the other aerobic and facultative anaerobic microorganisms and ≤4 mcg/mL against most (≥90%) strains of the strict anaerobic microorganisms in the following list; however, the safety and effectiveness of INVANZ in treating clinical infections due to these microorganisms have not been established in adequate and well-controlled clinical studies: AEROBIC AND FACULTATIVE ANAEROBIC GRAM-POSITIVE MICROORGANISMS: Staphylococcus species, coagulase-negative, methicillin-susceptible Streptococcus pneumoniae, penicillin-resistant Viridans streptococci.
Note: Methicillin-resistant staphylococci are resistant to INVANZ. Many strains of Enterococcus faecalis and most strains of Enterococcus faecium are resistant.
AEROBIC AND FACULTATIVE ANAEROBIC GRAM-NEGATIVE MICROORGANISMS: Citrobacter freundii, Enterobacter aerogenes, Enterobacter cloacae, Escherichia coli producing ESBLs, Haemophilus parainfluenzae, Klebsiella oxytoca, Klebsiella pneumoniae producing ESBLs, Morganella morganii, Proteus vulgaris, Serratia marcescens.
Note: Many strains of these organisms that are multiply resistant to other antibiotics, e.g., penicillins, cephalosporins (including third-generation) and aminoglycosides are susceptible to INVANZ.
ANAEROBIC MICROORGANISMS: Fusobacterium species.

Treatment: INVANZ is indicated for the treatment of patients with moderate to severe infections caused by susceptible strains of microorganisms, as well as initial empiric therapy prior to the identification of causative organisms in the infections listed as follows: Complicated Intra-Abdominal Infections; Complicated Skin and Skin Structure Infections including diabetic lower extremity and diabetic foot infections; Community Acquired Pneumonia; Community Acquired Pneumonia; Acute Pelvic Infections including postpartum endomyometritis, septic abortion and post surgical gynecologic infections.
INVANZ is indicated for the treatment of pediatric patients with moderate to severe infections caused by susceptible strains of microorganisms, as well as initial empiric therapy prior to the identification of causative organisms in the indications listed as follows: Complicated intra-abdominal infections; Complicated skin and skin structure infections; Community acquired pneumonia; Acute pelvic infections including postpartum endomyometritis, septic abortion and surgical gynaecologic infections.
Prevention: INVANZ is indicated in adults for the prophylaxis of surgical site infection following elective colorectal surgery.

The usual dose of INVANZ in patients 13 years of age and older is 1 gram (g) given once a day. The usual dose of INVANZ in patients 3 months to 12 years of age is 15 mg/kg twice daily (not to exceed 1 g/day).
INVANZ may be administered by intravenous (IV) infusion or intramuscular (IM) injection. When administered intravenously, INVANZ should be infused over a period of 30 minutes.
Intramuscular administration of INVANZ may be used as an alternative to intravenous administration in the treatment of those infections for which intramuscular therapy is appropriate.
The usual duration of therapy with INVANZ is 3 to 14 days but varies by the type of infection and causative pathogen(s). (See INDICATIONS.) When clinically indicated, a switch to an appropriate oral antimicrobial may be implemented if clinical improvement has been observed.
In controlled clinical studies, patients were treated from 3 to 14 days. Total treatment duration was determined by the treating physician based on site and severity of the infection, and on the patient's clinical response. In some studies, treatment was converted to oral therapy at the discretion of the treating physician after clinical improvement had been demonstrated.
Prophylaxis of surgical site infection following elective colorectal surgery: To prevent surgical site infections following elective colorectal surgery in adults, the recommended dosage is 1 g IV administered as a single intravenous dose given 1 hour prior to the surgical incision.
Patients with renal insufficiency: INVANZ may be used for the treatment of infections in adult patients with renal insufficiency. In patients whose creatinine clearance is >30 mL/min/1.73 m², no dosage adjustment is necessary. Adult patients with advanced renal insufficiency (creatinine clearance ≤30 mL/min/1.73 m²), including those on hemodialysis, should receive 500 mg daily. There are no data in pediatric patients with renal insufficiency.
Patients on Hemodialysis: In a clinical study, following a single 1 g IV dose of ertapenem given immediately prior to a hemodialysis session, approximately 30% of the dose was recovered in the dialysate. When adult patients on hemodialysis are given the recommended daily dose of 500 mg of INVANZ within 6 hours prior to hemodialysis, a supplementary dose of 150 mg is recommended following the hemodialysis session. If INVANZ is given at least 6 hours prior to hemodialysis, no supplementary dose is needed. There are no data in patients undergoing peritoneal dialysis or hemofiltration. There are no data in pediatric patients on hemodialysis.
When only the serum creatinine is available, the following formula** may be used to estimate creatinine clearance. The serum creatinine should represent a steady state of renal function.
**Cockcroft and Gault equation: Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976

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No dosage adjustment is recommended in patients with impaired hepatic function.
The recommended dose of INVANZ can be administered without regard to age (13 years and older) or gender.
Instructions for Use: Patients 13 years of age and older: Preparation for intravenous administration: DO NOT MIX OR CO-INFUSE INVANZ WITH OTHER MEDICATIONS.
DO NOT USE DILUENTS CONTAINING DEXTROSE (α-D-GLUCOSE).
INVANZ MUST BE RECONSTITUTED AND THEN DILUTED PRIOR TO ADMINISTRATION.
1. Reconstitute the contents of a 1 g vial of INVANZ with 10 mL of one of the following: Water for Injection, 0.9% Sodium Chloride Injection or Bacteriostatic Water for Injection.
2. Shake well to dissolve and immediately transfer contents of the reconstituted vial to 50 mL of 0.9% Sodium Chloride Injection.
3. Complete the infusion within 6 hrs of reconstitution.
Preparation for instramuscular administration: INVANZ MUST BE RECONSTITUTED PRIOR TO ADMINISTRATION.
1. Reconstitute the contents of a 1 g vial of INVANZ with 3.2 mL of 1.0% or 2.0% lidocaine HCl injection*** (without epinephrine). Shake vial thoroughly to form solution.
2. Immediately withdraw the contents of the vial and administer by deep intramuscular injection into a large muscle mass (such as the gluteal muscles or lateral part of the thigh).
3. The reconstituted IM solution should be used within 1 hour after preparation.
Note: The reconstituted solution should not be administered intravenously.
***Refer to the prescribing information for lidocaine HCl.
Pediatric patients 3 months to 12 years of age: Preparation for intravenous administration: DO NOT MIX OR CO-INFUSE INVANZ WITH OTHER MEDICATIONS.
DO NOT USE DILUENTS CONTAINING DEXTROSE (α-D-GLUCOSE).
INVANZ MUST BE RECONSTITUTED AND THEN DILUTED PRIOR TO ADMINISTRATION.
1. Reconstitute the contents of a 1 g vial of INVANZ with 10 mL of one of the following: Water for Injection, 0.9% Sodium Chloride Injection or Bacteriostatic Water for Injection.
2. Shake well to dissolve and immediately withdraw a volume equal to 15 mg/kg of body weight (not to exceed 1 g/day) and dilute in 0.9% Sodium Chloride Injection to a final concentration of 20 mg/mL or less.
3. Complete the infusion within 6 hrs of reconstitution.
Preparation for intramuscular administration: INVANZ MUST BE RECONSTITUTED PRIOR TO ADMINISTRATION.
1. Reconstitute the contents of a 1 g vial of INVANZ with 3.2 mL of 1.0% or 2.0% lidocaine HCl injection*** (without epinephrine). Shake vial thoroughly to form solution.
2. Immediately withdraw a volume equal to 15 mg/kg of body weight (not to exceed 1 g/day) and administer by deep intramuscular injection into a large muscle mass (such as the gluteal muscles or lateral part of the thigh).
3. The reconstituted IM solution should be used within 1 hour after preparation.
Note: The reconstituted solution should not be administered intravenously.
***Refer to the prescribing information for lidocaine HCl.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to use, whenever solution and container permit. Solutions of INVANZ range from colorless to pale yellow. Variations of color within this range do not affect the potency of the product.

No specific information is available on the treatment of overdosage with INVANZ. Intentional overdosing of INVANZ is unlikely. Intravenous administration of INVANZ at a 3 g daily dose for 8 days to healthy adult volunteers did not result in significant toxicity. In clinical studies in adults, inadvertent administration of up to 3 g in a day did not result in clinically important adverse experiences. In pediatric clinical studies, a single IV dose of 40 mg/kg up to a maximum of 2 g did not result in toxicity.
In the event of an overdose, INVANZ should be discontinued and general supportive treatment given until renal elimination takes place.
INVANZ can be removed by hemodialysis; however, no information is available on the use of hemodialysis to treat overdosage.

INVANZ 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 beta-lactams.
Due to the use of lidocaine HCl as a diluent, INVANZ administered intramuscularly is contraindicated in patients with a known hypersensitivity to local anesthetics of the amide type and in patients with severe shock or heart block. (Refer to the prescribing information for lidocaine HCl.)

Serious and occasionally fatal hypersensitivity reactions (including anaphylactoid and severe cutaneous adverse reactions) have been reported in patients receiving therapy with beta-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 beta-lactam. Before initiating therapy with INVANZ, careful inquiry should be made concerning previous hypersensitivity reactions to penicillins, cephalosporins, carbapenems, other beta-lactams and other allergens. If an allergic reaction to INVANZ occurs, discontinue the drug immediately and institute appropriate alternative therapy. Serious anaphylactic reactions require immediate emergency treatment.
Seizures and other central nervous system (CNS) adverse experiences have been reported during treatment with INVANZ (see SIDE EFFECTS). During clinical investigations in adult patients treated with INVANZ (1 g once a day), seizures, irrespective of drug relationship, occurred in 0.5% of patients during study therapy plus 14-day follow-up period. These experiences have occurred most commonly in patients with CNS disorders (e.g., brain lesions or history of seizures) and/or compromised renal function. Close adherence to the recommended dosage regimen 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 and the dosage of INVANZ re-examined to determine whether it should be decreased or discontinued.
Case reports in the literature have shown that co-administration of carbapenems, including ertapenem, to patients receiving valproic acid or divalproex sodium results in a reduction in valproic acid concentrations. The valproic acid concentrations may drop below the therapeutic range as a result of this interaction, therefore increasing the risk of breakthrough seizures. Increasing the dose of valproic acid or divalproex sodium may not be sufficient to overcome this interaction. The concomitant use of ertapenem and valproic acid/divalproex sodium is generally not recommended. Anti-bacterials other than carbapenems should be considered to treat infections in patients whose seizures are well controlled on valproic acid or divalproex sodium. If administration of INVANZ is necessary, supplemental anti-convulsant therapy should be considered (see INTERACTIONS.)
As with other antibiotics, prolonged use of INVANZ may result in overgrowth of non-susceptible organisms. Repeated evaluation of the patient's condition is essential. If superinfection occurs during therapy, appropriate measures should be taken.
Pseudomembranous colitis has been reported with nearly all antibacterial agents, including ertapenem, and may range in severity from mild to life-threatening. Therefore, it is important to consider this diagnosis in patients who present with diarrhea subsequent to the administration of antibacterial agents. Studies indicate that a toxin produced by Clostridium difficile is a primary cause of "antibiotic-associated colitis".
Caution should be taken when administering INVANZ intramuscularly, to avoid inadvertent injection into a blood vessel (see DOSAGE & ADMINISTRATION).
Lidocaine HCl is the diluent for intramuscular administration of INVANZ. Refer to the prescribing information for lidocaine HCl.
Use in children: Safety and effectiveness of INVANZ in pediatric patients 3 months to 17 years of age are supported by evidence from adequate and well-controlled studies in adults, pharmacokinetic data in pediatric patients, and additional data from comparator-controlled studies in pediatric patients 3 months to 17 years of age with the following infections: Complicated Intra-Abdominal Infections; Complicated Skin and Skin Structure Infections; Community Acquired Pneumonia; Acute Pelvic Infections.
INVANZ is not recommended in infants under 3 months of age as no data are available.
Use in the elderly: In clinical studies, the efficacy and safety of INVANZ in the elderly (≥65 years) was comparable to that seen in younger patients (<65 years).

PREGNANCY: There are no adequate and well-controlled studies in pregnant women. INVANZ should be used during pregnancy only if the potential benefit justifies the potential risk to the mother and fetus.
NURSING MOTHERS: Ertapenem is excreted in human milk (see PHARMACOLOGY: Pharmacokinetics: Distribution under Actions). Caution should be exercised when INVANZ is administered to a nursing woman.

Adult Patients: The total number of patients treated with ertapenem in clinical studies was over 1900 of which over 1850 received a 1 g dose of INVANZ. Most adverse experiences reported in these clinical studies were described as mild to moderate in severity. Drug-related adverse experiences were reported in approximately 20% of patients treated with ertapenem. Ertapenem was discontinued due to adverse experiences thought to be drug-related in 1.3% of patients.
The most common drug-related adverse experiences reported during parenteral therapy in patients treated with ertapenem were diarrhea (4.3%), infused vein complication (3.9%), nausea (2.9%) and headache (2.1%).
The following drug-related adverse experiences were reported during parenteral therapy in adult patients treated with ertapenem: Common (≥1/100, <1/10): Nervous system disorders: Headache.
Vascular disorders: Infused vein complication, phlebitis/thrombophlebitis.
Gastrointestinal disorders: Diarrhea, nausea, vomiting.
Uncommon (>1/1000, <1/100): Nervous system disorders: Dizziness, somnolence, insomnia, seizure, confusion.
Cardiac and vascular disorders: Extravasation, hypotension.
Respiratory, thoracic and mediastinal disorders: Dyspnea.
Gastrointestinal disorders: Oral candidiasis, constipation, acid regurgitation, C. difficile-associated diarrhea, dry mouth, dyspepsia, anorexia.
Skin and subcutaneous tissue disorders: Erythema, pruritus.
General disorders and administration site conditions: Abdominal pain, taste perversion, asthenia/fatigue, candidiasis, edema/swelling, fever, pain, chest pain.
Reproductive system and breast disorders: Vaginal pruritus.
In clinical studies, seizure was reported during parenteral therapy in 0.2% of patients treated with ertapenem, 0.3% of patients treated with piperacillin/tazobactam and 0% of patients treated with ceftriaxone.
In the majority of clinical studies, parenteral therapy was followed by a switch to an appropriate oral antimicrobial. During the entire treatment period and a 14 day post treatment follow-up period, drug-related adverse experiences in patients treated with INVANZ included those listed previously as well as rash and vaginitis at an incidence of ≥1.0% (common) and allergic reactions, malaise and fungal infections at an incidence of >0.1% but <1.0% (uncommon).
In a clinical study for the treatment of diabetic foot infections in which 289 adult diabetic patients were treated with ertapenem, the drug-related adverse experience profile was generally similar to that seen in previous clinical trials.
In a clinical study for the prophylaxis of surgical site infections following elective colorectal surgery in which 476 adult patients received a 1 g dose of ertapenem prior to surgery, the only drug-related adverse experience during parenteral therapy that was not seen in previous clinical trials was sinus bradycardia reported at an incidence of >0.1% but <1.0% (uncommon).
Pediatric Patients: The total number of pediatric patients treated with ertapenem in clinical studies was 384. The overall safety profile is comparable to that in adult patients. In clinical trials, the most common drug-related clinical adverse experiences reported during parenteral therapy were diarrhea (5.5%), infusion site pain (5.5%) and infusion site erythema (2.6%).
The following drug-related adverse experiences were reported during parenteral therapy in pediatric patients treated with ertapenem: Common (≥1/100, <1/10): Gastrointestinal disorders: Diarrhoea, vomiting.
General disorders and administration site conditions: Infusion site erythema, infusion site pain, phlebitis, infusion site swelling.
Skin and subcutaneous tissue disorders: Rash.
Additional drug-related adverse experiences that were reported during parenteral therapy in >0.5% but <1.0% of patients treated with INVANZ in clinical studies include: infusion site induration, infusion site pruritus, infusion site warmth and phlebitis.
In the pediatric clinical studies, the majority of the patients had parenteral therapy followed by a switch to an appropriate oral antimicrobial. During the entire treatment period and a 14 day posttreatment follow-up period, drug-related adverse experiences in patients treated with INVANZ were no different than those previously listed.
Post-Marketing Experience: The following post-marketing adverse experiences have been reported: Immune System: anaphylaxis including anaphylactoid reactions.
Psychiatric Disorders: altered mental status (including agitation, aggression, delirium, disorientation, mental status changes).
Nervous System Disorders: depressed level of consciousness, dyskinesia, gait disturbance, hallucinations, myoclonus, tremor, encephalopathy (recovery may be prolonged in patients with renal impairment).
Gastrointestinal Disorders: teeth staining.
Skin and Subcutaneous Tissue Disorders: Acute Generalized Exanthematous Pustulosis (AGEP), Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS syndrome), urticaria, hypersensitivity vasculitis Musculoskeletal and Connective Tissue Disorders: muscular weakness.
Laboratory Test Findings: Adult Patients: The most frequently observed drug-related laboratory abnormalities during parenteral therapy in patients receiving INVANZ were elevations in ALT, AST, alkaline phosphatase and platelet count.
In the majority of clinical studies, parenteral therapy was followed by a switch to an appropriate oral antimicrobial. During the entire treatment period and a 14 day post treatment follow-up period, drug-related laboratory abnormalities in patients treated with INVANZ were no different than those listed previously.
Other drug-related laboratory abnormalities included the following: Increases in direct serum bilirubin, total serum bilirubin, eosinophils, indirect serum bilirubin, PTT, urine bacteria, BUN, serum creatinine, serum glucose, monocytes, urine epithelial cells, urine red blood cells; decreases in segmented neutrophils, white blood cells, hematocrit, hemoglobin and platelet count.
In a clinical study for the treatment of diabetic foot infections in which 289 adult diabetic patients were treated with ertapenem, the drug-related laboratory adverse experience profile was generally similar to that seen in previous clinical trials.
In a clinical study for the prophylaxis of surgical site infections following elective colorectal surgery in which 476 adult patients received a 1 g dose of ertapenem prior to surgery, there was no additional drug related laboratory adverse experiences reported during parenteral therapy.
Pediatric Patients: The most frequently observed drug-related laboratory abnormality during parenteral therapy in patients receiving INVANZ was decreases in neutrophil count.
Other drug-related laboratory abnormalities during the entire treatment period plus 14day follow-up included the following: elevations in ALT and AST, decreases in white blood cells, and increases in eosinophils.

When ertapenem is administered with probenecid, probenecid competes for active tubular secretion and thus inhibits the renal excretion of ertapenem. This leads to small but statistically significant increases in the elimination half-life (19%) and in the extent of systemic exposure (25%). No dosage adjustment is necessary when ertapenem is given with probenecid. Because of the small effect on half-life, the co-administration with probenecid to extend the half-life of ertapenem is not recommended.
In vitro studies indicate that ertapenem does not inhibit P-glycoprotein-mediated transport of digoxin or vinblastine and that ertapenem is not a substrate for P-glycoprotein-mediated transport. In vitro studies in human liver microsomes indicate ertapenem does not inhibit metabolism mediated by any of the six major cytochrome p450 (CYP) isoforms: 1A2, 2C9, 2C19, 2D6, 2E1 and 3A4. Drug interactions caused by inhibition of P-glycoprotein-mediated drug clearance or CYP-mediated drug clearance are unlikely. (See PHARMACOLOGY: Pharmacokinetics: Distribution and Metabolism under Actions.)
Other than with probenecid, no specific clinical drug interaction studies have been conducted.
Case reports in the literature have shown that co-administration of carbapenems, including ertapenem, to patients receiving valproic acid or divalproex sodium results in a reduction of valproic acid concentrations. The valproic acid concentrations may drop below the therapeutic range as a result of this interaction, therefore increasing the risk of breakthrough seizures. Although the mechanism of this interaction is unknown, data from in vitro and animal studies suggest that carbapenems may inhibit the hydrolysis of valproic acid's glucuronide metabolite (VPA-g) back to valproic acid, thus decreasing the serum concentrations of valproic acid. (See PRECAUTIONS.)

Before reconstitution: Do not store lyophilized powder above 25°C (77°C).
Reconstituted and infusion solutions: The reconstituted solution, immediately diluted in 0.9% Sodium Chloride Injection (see DOSAGE & ADMINISTRATION: INSTRUCTIONS FOR USE), may be stored at room temperature (25°C) and used within 6 hours or stored for 24 hours under refrigeration (5°C) and used within 4 hours after removal from refrigeration. Solutions of INVANZ should not be frozen.

Other Beta-Lactams

J01DH03 - ertapenem ; Belongs to the class of carbapenems. Used in the systemic treatment of infections.

B