Ampicillin 500 mg: Dosing Schedule, Administration & Duration

Dose: 500 mg per capsule.

Frequency: Four times daily (q6h).

Administration: On empty stomach – 1 hour before meals or 2 hours after; also at bedtime.

Duration: Typically 7–10 days for susceptible infections (strep, enterococcal, H. influenzae, some anaerobes). Adjust for renal impairment (CrCl <10 mL/min: 500 mg q12h).

Complete full course; monitor for rash (mononucleosis), diarrhea (C. diff), superinfection.