Septra; Antibacterial, Sulfa; Susp per 5 mL: Trimethoprim 40 mg, sulfamethoxazole 200 mg 
 Tab (single strength or SS): Trimethoprim 80 mg, sulfamethoxazole 400 mg; 
 Tab (double strength or DS): Trimethoprim 160 mg, sulfamethoxazole 800 mg 
 Inj (per mL): Trimethoprim 16 mg, sulfamethoxazole 80 mg; 
Children >2 mos: 
 Mild-Moderate Infections: 6-12 mg of trimethoprim/kg/day PO bid 
 Serious Infections (Pneumocystis): 15-20 mg of trimethoprim/kg/day PO/IV q6h 
 UTI 
Prophylaxis: 2 mg of trimethoprim/kg/day PO qd (max 160 mg/day trimethoprim) 
 Pneumocystis 
Prophylaxis: 5-10 mg of trimethoprim/kg/day PO bid three days per week (max 320 mg/day) 
 Sodium citrate and citric acid (Bicitra); Electrolyte Supplement; Liq per 5 mL: sodium citrate 500 mg, citric acid 334 mg ; 2-3 mEq/kg/day PO tid-qid 
 Equivalent to 1 mEq sodium and 1 mEq bicarbonate per mL.