(mafenide acetate, USP)
FOR 5% TOPICAL SOLUTION
Mafenide acetate, USP is a synthetic antimicrobial agent designated chemically as a-amino-p- toluenesulfonamide monoacetate. It has the following structural formula:
C7H10N2O2S • C2H4O2
Mafenide acetate, USP is a white, crystalline powder which is freely soluble in water.
SULFAMYLON® (mafenide acetate) For 5% Topical Solution is provided in packets containing 50 g of sterile mafenide acetate to be reconstituted in 1000 mL of Sterile Water for irrigation, USP or 0.9% Sodium Chloride Irrigation, USP. After mixing, the solution contains 5% w/v of mafenide acetate. The solution is an antimicrobial preparation suitable for topical administration. The solution Is not for Injection. The reconstituted solution may be held up to 28 days after preparation if stored in unopened containers. ONCE A CONTAINER IS OPENED, ANY UNUSED PORTION SHOULD BE DISCARDED AFTER 48 HOURS. Store the reconstituted solution at 20° to 25°C (68° to 77°F). Limited storage periods at 15° to 30°C (59° to 86°F) are acceptable.
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SULFAMYLON® (mafenide acetate) For 5% Topical Solution is indicated for use as an adjunctive topical antimicrobial agent to control bacterial infection when used under moist dressings over meshed autografts on excised burn wounds.
DOSAGE AND ADMINISTRATION
SULFAMYLON® (mafenide acetate) For 5% Topical Solution: Directions for Preparation of the Solution: SULFAMYLON® (mafenide acetate) (mafenide acetate) For 5% Topical Solution is supplied as a sterile powder and is to be reconstituted with Sterile Water for Irrigation, USP or 0.9% Sodium Chloride Irrigation, USP. Aseptic techniques should be observed during preparation of the solution. Pre- measured quantities of 50 g of mafenide acetate powder are provided in sterile packets. The entire quantity of SULFAMYLON® (mafenide acetate) should be emptied into a suitable container which contains 1000 mL of Sterile Water for Irrigation, USP or 0.9% Sodium Chloride Irrigation, USP and mixed until completely dissolved. The reconstituted solution may be held up to 28 days after preparation if stored in unopened containers. ONCE A CONTAINER IS OPENED, ANY UNUSED PORTION SHOULD BE DISCARDED AFTER 48 HOURS. Store the reconstituted solution at 20° to 25°C (68° to 77°F). Limited storage periods at 15° to 30°C (59° to 86°F) are acceptable. Not for Injection - For Topical Use Only.
Directions for Use of the Solution: The grafted area should be covered with one layer of fine mesh gauze. An eight-ply bum dressing should be cut to the size of the graft and wetted with SULFAMYLON® (mafenide acetate) 5% SOLUTION using an irrigation syringe and/or irrigation tubing until leaking is noticeable. If irrigation tubing is used, the tubing should be placed over the bum dressing in contact with the wound and covered with a second piece of eight-ply dressing. The irrigation dressing should be secured with a bolster dressing and wrapped as appropriate. The gauze dressing should be kept wet. In clinical studies, this has been accomplished by irrigating with a syringe or injecting the solution into the irrigation tubing every 4 hours or as necessary. If irrigation tubing is not used, the gauze dressing may be moistened every 6-8 hours or as necessary to keep wet.
Wound dressings maybe left undisturbed, except for the irrigations, for up to five days. Additional soaks may be initiated until graft take is complete. Maceration of skin may result from wet dressings applied for intervals as short as 24 hours. Treatment is usually continued until autograft vascularization occurs and healing is progressing (typically occurring in about 5 days). Safety and effectiveness have not been established for longer than 5 days for an individual grafting procedure.
If allergic manifestations occur during treatment with SULFAMYLON® (mafenide acetate) 5% SOLUTION, discontinuation of treatment should be considered. If acidosis occurs and becomes difficult to control, particularly in patients with pulmonary dysfunction, discontinuing the soaks with the mafenide acetate solution for 24 to 48 hours may aid in restoring acid-base balance (see PRECAUTIONS section). Dressing changes and monitoring the site for bacterial growth during this interruption should be adjusted accordingly.
SULFAMYLON® (mafenide acetate, USP) For 5% Topical Solution is available in packets (NDC 51079-624-84) containing 50 g of sterile mafenide acetate to be prepared using 1000 mL Sterile Water for Irrigation, USP or 0.9% Sodium Chloride Irrigation, USP. (See DOSAGE AND ADMINISTRATION: SULFAMYLON® (mafenide acetate) For 5% Topical Solution: Directions for Preparation of the Solution.) The packets are supplied as follows:
Carton of five 50 g packets
Packets - Store PACKETS in a dry place at room temperature 15° to 30°C (59° to 86°F).
Prepared Solution - Store SOLUTION at 20° to 25°C (68° to 77°F) with excursions permitted to 15° to 30°C (59° to 86°F). [See USP Controlled Room Temperature.]
The solution may be held for up to 28 days if stored in unopened containers.
ONCE A CONTAINER IS OPENED, ANY UNUSED SOLUTION MUST BE DISCARDED WITHIN 48 HOURS.
Distributed By: UDL Laboratories, Inc. Rockford, IL 61103. REVISED APRIL 2006. FDA rev date: 12/18/2002
In the clinical setting of severe bums, it is often difficult to distinguish between an adverse reaction to mafenide acetate and bum sequelae. In a clinical study of pediatric patients with acute bums requiring autografts who received SULFAMYLON® (mafenide acetate) 5% SOLUTION in addition to double antibiotic solution (DAB) wound therapy (neomycin sulfate 40 mg and polymyxin B 200,000 units/liter), the incidence of rash (4.6%) and itching (2.8%) in the group which received SULFAMYLON® (mafenide acetate) 5% Solution was not different from that experienced with (DAB) dressings alone (5.7% and 1.3%, respectively).
From other clinical settings, a single case of bone marrow depression and a single case of an acute attack of porphyria have been reported following therapy with mafenide acetate. Fatal hemolytic anemia with disseminated intravascular coagulation, presumably related to a glucose-6-phosphate dehydrogenase deficiency, has been reported following therapy with mafenide acetate. The following adverse reactions have been reported with topical mafenide acetate therapy:
Dermatologlc and Allergic: Pain or burning sensation, rash and pruritus (often localized to the area covered by the wound dressing), erythema, skin maceration from prolonged wet dressings, facial edema, swelling, hives, blisters, eosinophilia.
No information provided.
General: Mafenide acetate and its metabolite, p-carboxybenzenesulfonamide, inhibit carbonic anhydrase, which may result in metabolic acidosis, usually compensated by hyperventilation. In the presence of impaired renal function, high blood levels of mafenide acetate and its metabolite may exaggerate the carbonic anhydrase inhibition. Therefore, close monitoring of acid-base balance is necessary, particularly in patients with extensive second-degree or partial thickness bums and in those with pulmonary or renal dysfunction. Some bum patients treated with mafenide acetate have also been reported to manifest an unexplained syndrome of masked hyperventilation with resulting respiratory alkalosis (slightly alkaline blood pH, low arterial pC02, and decreased total C02); change in arterial p02 is variable. The etiology and significance of these findings are unknown.
Mafenide acetate should be used with caution in bum patients with acute renal failure.
Carcinogenesis, Mutagenesis, Impairment of Fertility:
Animal studies have not been performed to evaluate the potential effects of mafenide acetate on fertility.
Pregnancy: Teratogenic Effects. Pregnancy Category C: A teratology study performed in rats using oral doses of up to 600 mg/kg/day revealed no evidence of harm to the fetus due to mafenide acetate. There are no adequate data regarding the potential reproductive toxicity of mafenide acetate in a non-rodent species, nor are there adequate and well-controlled studies in pregnant women. Mafenide acetate should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Nursing Mothers: It is not known whether mafenide acetate is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from mafenide acetate, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Pediatric Use: The safety and effectiveness of SULFAMYLON® (mafenide acetate) For 5% Topical Solution have been established in the age groups 3 months to 16 years. Geriatric Use: No studies have been conducted to specifically examine the effects of mafenide acetate on bum wounds in geriatric patients.
Single oral doses of 2000 mg/kg of mafenide acetate as a 5% solution did not cause mortality or clinical symptoms of toxicity in rats.
SULFAMYLON® (mafenide acetate) For 5% Topical Solution is contraindicated in patients who are hypersensitive to mafenide acetate. It is not known whether there is cross sensitivity to other sulfonamides.
Mechanism of Action:
The mechanism of action of mafenide is not known, but is different from that of the sulfonamides. Mafenide is not antagonized by pABA, serum, pus or tissue exudates, and there is no correlation between bacterial sensitivities to mafenide and to the sulfonamides. Its activity is not altered by changes in the acidity of the environment. The osmolality of the 5% topical solution is approximately 340 mOsm/kg.
Absorption and Metabolism: Applied topically, mafenide acetate diffuses through devascularized areas. Approximately 80% of a mafenide acetate dose is delivered to burned tissue over four hours following topical application of the 5% solution. Following application of mafenide acetate cream and solution, peak mafenide concentrations in human burned skin tissue occur at two and four hours, respectively. Peak tissue concentrations are similar following administration of the solution or cream. Once absorbed, mafenide is rapidly converted to an inactive metabolite (p-carboxybenzenesulfonamide) which is cleared through the kidneys. Clinical studies have shown that when applied topically to burns as an 11.2% mafenide acetate cream, blood levels of the parent drug peaked at 2 hours following application, ranging from 26 to 197 ug/mL for single doses of 14 to 77 g of mafenide acetate. Metabolite levels peaked at 3 hours, ranging from 10 to 340 ug/mL. Twenty-four hours after application, combined parent and metabolite blood levels had fallen to pretreatment levels.
In Vitro Cytotoxicity: Data from in vitro studies on cell culture suggests that mafenide acetate may have a deleterious effect on human keratinocytes. The clinical significance of this information is unknown.
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