M421 Pill — WHITE ROUND, 8mm — Phenobarbital
| Imprint | M421 |
|---|---|
| Colour | WHITE |
| Shape | ROUND |
| Size | 8 |
| Strength | PHENOBARBITAL 16.2 mg;HYOSCYAMINE SULFATE 0.1037 mg;ATROPINE SULFATE 0.0194 mg;SCOPOLAMINE HYDROBROMIDE 0.0065 mg |
| Dosage form | Tablet |
| Manufacturer | Method Pharmaceuticals, LLC |
| NDC | 58657-421 |
| Schedule | — |
| Availability | — |
| Ingredients | PHENOBARBITAL[PHENOBARBITAL];HYOSCYAMINE SULFATE[HYOSCYAMINE];ATROPINE SULFATE[ATROPINE];SCOPOLAMINE HYDROBROMIDE[SCOPOLAMINE] |
What does this imprint mean?
The imprint "M421" 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
Phenobarbital
Uses and warnings
Drug classA "nonselective central nervous system (CNS) depressant" and barbituric-acid derivative, used as a "sedative-hypnotic" and "anticonvulsant."UsesIndicated as a sedative, and "for the treatment of...
Read the full drug profile →How to identify this pill
- • Check the imprint matches exactly: "M421".
- • Confirm the colour (WHITE) and shape (ROUND).
- • Compare the size (8) 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 d74273b6-ebea-41e6-8976-6115719023d5.xml