All the following anti-tubercular drugs are hepatotoxic except: (A) Rifampicin, (B) INH, (C) Ethambutol, (D) Pyrazinamide
Answer is C. Ans. c (Ethambutol). (Ref. Harrison's Medicine - 18th/Table 168-3; KD Tripathi 5th/- 703)# Hepatotoxic AKT drugs- INH- Rifampicin- Pyrazinamide (most toxic)# Nephrotoxic AKT drug- Streptomycin# Neurotoxic drugs- Cyclosporin- INH# Drug Contraindicated in AIDS- ThiacetazoneOptic neuritis, the most serious adverse effect of ethambutol.