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Antibiotics & antivirals

Ampicillin Trihydrate

Ampicillin Trihydrate is a covered generic medication on Tab's $0 list. Here's what it's used for, typical dosing, and side effects, sourced from FDA-approved drug labeling.

$0 with active Tab membership Oral

What it's used for

Ampicillin is an antibiotic used to treat bacterial infections. It is recommended for treating infections proven or strongly suspected to be caused by susceptible bacteria.

Source: U.S. FDA-approved prescribing information (openFDA).

Typical dosing

For adults and children over 20 kg, the usual dose for genitourinary or gastrointestinal infections is 500 mg four times daily in equally spaced doses.

Dosing shown here is the general FDA-labeled range. Your prescribing clinician determines the exact dose, form, and schedule for you — this is not a substitute for medical advice.

Boxed warning / key safety info

Serious and sometimes fatal allergic reactions have been reported in patients receiving penicillin therapy.

Common side effects

Untoward reactions are essentially limited to sensitivity phenomena, especially in individuals with a history of allergies or penicillin hypersensitivity.

Covered strengths on the Tab $0 list

Ampicillin Trihydrate 500mg Capsule

Covered at $0 with an active Tab membership when filled at a participating pharmacy nationwide or through mail order. A licensed clinician must prescribe the medication.

Related medications

AcyclovirAmoxicillinAzithromycinBacitracinCephalexinCiclopirox

Other antibiotics & antivirals medications covered at $0 with an active Tab membership.

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Tab is a membership and prescription-discount program—not insurance, and not a substitute for it. $0 pricing applies to medications on the current covered generic list with active membership, at participating pharmacy locations nationwide or through mail order, and is subject to change. Mail-order home delivery is preferred for recurring prescriptions; activation, availability, and delivery timing apply. This page is for general reference, drawn from FDA-approved drug labeling, and is not medical advice. Only a licensed clinician can determine if a medication is right for you.