Which antibiotic is listed with a dosing of 250 mg four times daily for one week?

• A. Keflex
• B. Augmentin
• C. Dicloxacillin
• D. Tobra/Gent

Answer: (C)

Dosing 250 mg four times daily fits a common oral regimen for a penicillinase‑resistant penicillin. Dicloxacillin is designed to withstand penicillinases produced by staphylococci, making it a typical choice for mild staph infections treated on an outpatient basis. The 250 mg qid schedule delivers about 1 gram per day, a standard amount for many mild skin and soft tissue infections, often prescribed for about a week. Other drugs in the list usually have different standard dosing patterns or administration routes (for example, cephalexin often uses higher per-dose amounts or different intervals, Augmentin has distinct dosing options due to clavulanate, and aminoglycosides like tobramycin/gentamicin are not given in a fixed 250 mg qid oral regimen). Thus, the 250 mg four times daily for one week most closely aligns with dicloxacillin.