FCPS part 1 Medicine solved mcqs with explanation
Q2: A patient has been taking
anti-tuberculous therapy for MDR-TB. His drugs regimen contains 6 drugs. The
patient eventually develops difficulty in distinguishing red & green
colours. Which of the following drugs is responsible for this effect?
a) Amiodrone
b) Pyrazinamide
c) Rifampicin
d) Ethambutol
e) Ciprofloxacin
Correct Answer: d
Explanation:
Ethambutol is one of the drugs used
in anti-tuberculous therapy. Optic neuritis is an important, though rare side
effect of ethambutol. If optic neuritis develops, red-green colour vision may
be lost first. This agent should probably not be used in young children in whom
it may be difficult to assess vision.
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