Use in sulfonamide allergy contraindicated. Should be applied with caution in hypersensitivity to mafenide. Fungal or bacterial superinfection, including C. difficile-associated diarrhea and pseudomembranous colitis observed with prolonged use. Use caution in G6PD deficiency (might increase risk of DIC or hemolytic anemia), and in renal impairment. Some dosage forms contain sulfites (might cause allergic reactions). For external use only.