After 6 or 7 days, patients who have clinically improved can be switched to one of the following oral antibiotics to complete the 14-day course: Amoxicillin 500 mg 3 times a day Ampicillin 500 mg 4 times a day Penicillin V 500 mg 4 times a day Oral antibiotics can be used for patients with mild disease for the entire course of therapy.