Pharmacology A patient of MDR Tb is on anti-tubercular drugs. After few months, he develops red-green color blindness. Most likely drug causing this symptom is: A Rifampicin B Ethambutol C Isoniazid D Streptomycin 💡 Explanation A patient of MDR Tb is on anti-tubercular drugs. After few months, he develops red-green color blindness. Most likely drug causing this symptom is: ✓ Correct Answer: B. Ethambutol