Azithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit.

• Amoxicillin is a penicillin-class antibiotic.

• Ciprofloxacin is a fluoroquinolone.

• Cephalexin is a first-generation cephalosporin.

The Kefauver-Harris Amendment required proof of efficacy as well as safety before a drug could be approved.

Schedule III and IV prescriptions may be refilled up to 5 times in 6 months under federal law; Schedule V is often governed differently depending on the substance and product, but this is the classic federal refill rule tested for III-IV.