<prompt> All the following anti-tubercular drugs are hepatotoxic exceptRifampicinINHEthambutolPyrazinamide  <response>: Ans. c Ethambutol. Ref. Harrisons Medicine - 18thTable 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. 