Pharmacology The ratio of concentration of drug in co-trimoxazole of trimethoprim and surfamethoxazole is: A 1:02 B 1:03 C 1:05 D 3:01 💡 Explanation The ratio of concentration of drug in co-trimoxazole of trimethoprim and surfamethoxazole is: ✓ Correct Answer: C. 1:05