Pharmacology D.O.C 7bfb2a6b Drug of choice for pneumocystis carinii: A Cotrimoxazole B Erythromycin C Penicillin D Metronidazole High-Yield Explanation Ans. is 'a' Cotrimoxazole Trimethoprim - Sulfamethoxazole (Cotrimoxazole) is the drug of choice for all forms of pneumocystis carinii infection.