Azithromycin
Azithromycin is used to treat infections caused by bacteria. It is also used to treat and prevent disseminated Mycobacterium avium complex (MAC) infection [a type of lung infection that affects people with a suppressed immune system).
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Based on 30 MLs per month. US $0.23 vs India $0.01 per ML.
Azithromycin is filled about 8.8M times a year under Medicare Part D. At the prices above, that works out to roughly:
Rough estimate. Based on Medicare Part D prescription volume (not the entire US market) scaled by the representative monthly price — actual totals depend on dose, duration and coverage.