Sulfamethoxazole 800mg ... Renal impairment (CrCl 15–30mL/min): reduce dose by ½; CrCl <15mL/min: not recommended. Not for group A β-hemolytic strep. Avoid prolonged administration.

Sulfamethoxazole 400mg ... Renal impairment (CrCl 15–30mL/min): reduce dose by ½; (CrCl <15mL/min): not recommended. <2 months: see Contraindications. ≥2 months: 8mg/kg per day trimethoprim ...