Antimicrobials commonly used for urinary tract infection: sulfonamides, trimethoprim-sulfamethoxazole, nitrofurantoin, nalidixic acid. Can patients with sulfa allergy take nitrofurantoin? Other first line treatment options are available for patients with sulfonamide antimicrobial allergies diagnosed with uncomplicated cystitis, including nitrofurantoin and fosfomycin . What drugs should be avoided with sulfa allergy? DrugsRead More →