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You are here: Home » Products Listed by Brand » McKesson Products » Drug Reference (A's) » Ampicillin

The appearance of any medication may be subject to change. The appearance of any medication may vary from country to country.


PRINCIPEN Capsules (Ampicillin Capsules USP) 250 mg and 500 mg
PRINCIPEN for Oral Suspension (Ampicillin for Oral Suspension USP) 125 mg/5 mL and 250 mg/5 mL

Ampicillin trihydrate is a semisynthetic penicillin derived from the basic penicillin nucleus, 6-aminopenicillanic acid. Ampicillin is designated chemically as (2S, 5R, 6R)-6-[(8)-2-Amino-2-phenylacetamido]-3,3-dimethyl-t-oxo-4-thia-1- azabicyclo[3.2.0] heptane-2-carboxylic acid. The chemical formula is C16H19N3O4S3H2O and its molecular weight is 403.45.

PRINCIPEN Capsules (Ampicillin Capsules USP) for oral administration provide ampicillin trihydrate equivalent to 250 mg and 500 mg ampicillin.
Inactive ingredients: black iron oxide, gelatin, FD&C Blue #1, FD&C Red #3, FD&C Red #40, lactose monohydrate, silica gel, and titanium dioxide.
PRINCIPEN for Oral Suspension (Ampicillin for oral suspension USP) provide, after constitution, ampicillin trihydrate equivalent to 125 mg and 250 mg ampicillin per 5 mL.
Inactive ingredients: antifoam AF emulsion, Atmos 300, colloidal silicon dioxide, FD&C Red #40, lecithin, natural and artificial flavors, sucrose, sodium citrate, sodium benzoate, and vanillin.

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