Pharmacology Dosage of benzyl penicillin in treatment of primary syphiis is – A 1.2 MU single i.m. B 1.2 MU single i.v. C 2.4 MU single i.m. D 4.8 MU single i.m. 💡 Explanation Dosage of benzyl penicillin in treatment of primary syphiis is - ✓ Correct Answer: C. 2.4 MU single i.m.