A patient received 500 mg of azithromycin (Zithromax) at 0800 as a first dose. What are the usual amount and time of the second dose of azithromycin?
a. 250 mg at 2000 the same day
b. 500 mg at 2000 the same day
c. 250 mg at 0800 the next day
d. 500 mg at 0800 the next day
ANS: C
Azithromycin generally is given as 500 mg on the first day and then 250 mg/day for the next 4 days, so the second dose would be 24 hours after the first dose.
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