Pill identification — FDA label match
F 91 Pill — Ondansetron Hydrochloride 4 mg (White, Oval)
A white oval tablet with the imprint F 91 matches the FDA label for Ondansetron Hydrochloride 4 mg. Compare every detail below with your pill, and confirm with a pharmacist before relying on it.
| Imprint | F 91 |
|---|---|
| Imprint parts | F · 91 (the code is split across the pill — often one part per side) |
| Generic name | Ondansetron Hydrochloride |
| Active ingredient(s) | Ondansetron Hydrochloride 4 mg |
| Strength | 4 mg |
| Dosage form | Tablet, Film Coated |
| Colour | White |
| Shape | Oval |
| Size | 6 mm |
| Score | No score |
| Labeler | Remedyrepack Inc. |
| NDC examples | 70518-1585-0, 70518-1585-1, 70518-1585-2, 70518-1585-3, 70518-1585-4 … (15 package codes in total) |
What this medicine is
According to its FDA-approved label, Ondansetron Hydrochloride is described as follows (reference information only — not advice about whether it is right for anyone):
Ondansetron tablets are indicated for the prevention of nausea and vomiting associated with: highly emetogenic cancer chemotherapy, including cisplatin greater than or equal to 50 mg/m 2 initial and repeat courses of moderately emetogenic cancer chemotherapy radiotherapy in patients receiving...
Equivalent pills — same medicine, different imprint
The pills below contain the same active ingredient at the same strength (Ondansetron Hydrochloride 4 mg). Different makers stamp their own codes, so equivalent pills often look completely different. This is factual label information — it is not a suggestion to substitute one product for another; only a pharmacist or prescriber can advise on that.
Frequently asked questions
What pill has the imprint F 91?
A white oval tablet with the imprint F 91 matches the FDA label for Ondansetron Hydrochloride 4 mg. Always compare the colour, shape and size as well — short imprints are shared by different medicines — and confirm with a pharmacist.
What does the F 91 pill look like?
On its FDA label it is described as a white oval tablet, 6 mm, with a score recorded as: no score.
How can I be sure this identification is right?
Check every characteristic — imprint (both sides), colour, shape, size and score — against the pill in your hand. If all of them agree, the pill matches the FDA label shown here, but that is still not a guarantee: counterfeit pills copy real imprints. A pharmacist can confirm the identification in person, and you should never take a pill you are not certain about.
Browse: all pills with imprint F 91 · Ondansetron Hydrochloride — all forms & strengths · White pills · Oval pills
Source: FDA label data via DailyMed/openFDA · Label set ID ee3e8cbe-4f0b-4361-a1b5-8329d85a2932 · Record extracted from the openFDA bulk export of October 29, 2026. Spotted an error? Report it — include the imprint and what looks wrong.