Pill identification — FDA label match
X 51 Pill — Phenytoin Sodium 100 mg (White, Capsule)
A white capsule with the imprint X 51 matches the FDA label for Phenytoin Sodium 100 mg. Compare every detail below with your pill, and confirm with a pharmacist before relying on it.
| Imprint | X 51 |
|---|---|
| Imprint parts | X · 51 (the code is split across the pill — often one part per side) |
| Brand name | Extended Phenytoin Sodium |
| Generic name | Phenytoin Sodium |
| Active ingredient(s) | Phenytoin Sodium 100 mg |
| Strength | 100 mg |
| Dosage form | Capsule |
| Colour | White |
| Shape | Capsule |
| Size | 17 mm |
| Score | No score |
| Labeler | Remedyrepack Inc. |
| NDC examples | 70518-2227-0, 70518-2227-1, 70518-2227-2, 70518-2227-3, 70518-2227-4 … (6 package codes in total) |
What this medicine is
According to its FDA-approved label, Phenytoin Sodium is described as follows (reference information only — not advice about whether it is right for anyone):
Extended phenytoin sodium capsules are indicated for the treatment of tonic-clonic (grand mal) and psychomotor (temporal lobe) seizures and prevention and treatment of seizures occurring during or following neurosurgery. Extended phenytoin sodium capsules are indicated for the treatment of...
Equivalent pills — same medicine, different imprint
The pills below contain the same active ingredient at the same strength (Phenytoin Sodium 100 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 X 51?
A white capsule with the imprint X 51 matches the FDA label for Phenytoin Sodium 100 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 X 51 pill look like?
On its FDA label it is described as a white capsule, 17 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 X 51 · Phenytoin Sodium — all forms & strengths · White pills · Capsule pills
Source: FDA label data via DailyMed/openFDA · Label set ID 363cd347-d25e-42b9-9ce7-30642f3cb353 · Record extracted from the openFDA bulk export of October 29, 2026. Spotted an error? Report it — include the imprint and what looks wrong.