Generic name: ifosfamide
Dosage form: injection, powder, for solution
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IFEX should be administered intravenously at a dose of 1.2 grams per m2 per day for 5 consecutive days. Treatment is repeated every 3 weeks or after recovery from hematologic toxicity.
In order to prevent bladder toxicity, IFEX should be given with extensive hydration consisting of at least 2 liters of oral or intravenous fluid per day. Mesna should be used to reduce the incidence of hemorrhagic cystitis. IFEX should be administered as a slow intravenous infusion lasting a minimum of 30 minutes. Studies of IFEX in patients with hepatic or renal impairment have not been conducted [see Use in Specific Populations (8.6, 8.7)].
Injections are prepared for parenteral use by adding Sterile Water for Injection, USP or Bacteriostatic Water for Injection, USP (benzyl alcohol or parabens preserved), to the vial and shaking to dissolve. Before parenteral administration, the substance must be completely dissolved. Use the quantity of diluents shown below to constitute the product:
|Dosage Strength||Quantity of Diluent||Final Concentration|
|1 gram||20 mL||50 mg per mL|
|3 grams||60 mL||50 mg per mL|
Solutions of ifosfamide may be diluted further to achieve concentrations of 0.6 to 20 mg/mL in the following fluids:
5% dextrose Injection, USP
0.9% Sodium Chloride Injection, USP
Lactated Ringer’s Injections, USP
Sterile Water for Injection, USP
Because essentially identical stability results were obtained for Sterile Water admixtures as for the other admixtures (5% Dextrose Injection, 0.9% Sodium Chloride Injection, and Lactated Ringer’s Injection), the use of large volume parenteral glass bottles, Viaflex bags or PAB™ bags that contain intermediate concentrations or mixtures of excipients (e.g., 2.5% Dextrose Injection, 0.45% Sodium Chloride Injection, or 5% Dextrose and 0.9% Sodium Chloride Injection) is also acceptable.
Constituted or constituted and further diluted solutions of IFEX should be refrigerated and used within 24 hours. Benzyl-alcohol-containing solutions can reduce the stability of ifosfamide.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.