M 31 Pill — WHITE ROUND, 10mm — Allopurinol
| Imprint | M / 31 |
|---|---|
| Colour | WHITE |
| Shape | ROUND |
| Size | 10 |
| Strength | Allopurinol 100 mg |
| Dosage form | Tablet |
| Manufacturer | Cardinal Health |
| NDC | 55154-6222 |
| Schedule | — |
| Availability | — |
| Ingredients | Allopurinol[Allopurinol] |
What does this imprint mean?
The imprint "M 31" is a code stamped or printed on the tablet or capsule by the manufacturer, used to identify the drug, its strength and the maker.
Active ingredient
Allopurinol
Uses and warnings
No boxed warning. The label warns the drug "SHOULD BE DISCONTINUED AT THE FIRST APPEARANCE OF SKIN RASH," which may progress to more severe hypersensitivity including Stevens-Johnson syndrome, toxic epidermal necrolysis, hepatotoxicity, and death. Patients who develop a severe reaction "should not be restarted on the drug." Dosage of mercaptopurine or azathioprine must be reduced to about one-third to one-fourth the usual dose when combined with allopurinol. Hypersensitivity reactions may be increased in patients with decreased renal function, particularly with thiazide use.
Indicated for management of "the signs and symptoms of primary or secondary gout" (recurrent acute attacks, tophi, joint destruction, uric acid lithiasis, and/or nephropathy), for patients with leukemia, lymphoma and other malignancies with elevated serum/urinary uric acid from cytotoxic therapy, and for patients with recurrent calcium oxalate calculi with elevated urinary uric acid. The label stresses "THIS IS NOT AN INNOCUOUS DRUG. IT IS NOT RECOMMENDED FOR THE TREATMENT OF ASYMPTOMATIC HYPERURICEMIA."
How to identify this pill
- • Check the imprint matches exactly: "M 31".
- • Confirm the colour (WHITE) and shape (ROUND).
- • Compare the size (10) against a ruler if possible.
- • When in doubt, confirm with a pharmacist before taking any medication.
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Official references
Source: FDA Structured Product Label via NLM Pillbox archive (retired 2021); source file 29ad13a3-206e-4bb1-b0bf-327e576dee64.xml