M421 Pill – White Round Me-PB-Hyos PHENOBARBITAL 16.2 mg;HYOSCYAMINE SULFATE 0.1037 mg;ATROPINE SULFATE 0.0194 mg;SCOPOLAMINE HYDROBROMIDE 0.0065 mg
Quick Identification
The pill with imprint M421 is a white round tablet/capsule identified as Me-PB-Hyos PHENOBARBITAL 16.2 mg;HYOSCYAMINE SULFATE 0.1037 mg;ATROPINE SULFATE 0.0194 mg;SCOPOLAMINE HYDROBROMIDE 0.0065 mg.
| Imprint | M421 |
|---|---|
| Shape | ROUND |
| Colour | WHITE |
| 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 |
What Does This Imprint Mean?
The characters "M421" stamped, printed, or debossed onto this pill are its imprint code. Manufacturers are required by the FDA to give every tablet and capsule a unique imprint so it can be identified after it leaves its original packaging. Combined with the pill's shape and colour, the imprint is the fastest way to confirm exactly what a loose pill is.
Active Ingredient: Me-PB-Hyos
Generic name: Me-PB-Hyos. This pill contains PHENOBARBITAL 16.2 mg;HYOSCYAMINE SULFATE 0.1037 mg;ATROPINE SULFATE 0.0194 mg;SCOPOLAMINE HYDROBROMIDE 0.0065 mg.
Manufacturer & NDC
| Manufacturer | Method Pharmaceuticals, LLC |
|---|---|
| NDC | 58657-421 |
How to Identify This Pill
- Read the imprint code exactly as it appears (letters, numbers, and any dividing line) — it is the single most reliable identifier.
- Note the shape (round, oval, capsule, etc.) and colour, and compare both against the details above.
- Check the size if you have a ruler or pill gauge — imprint plus size narrows down look-alikes.
- Compare the pill photo above side-by-side with the physical pill in good lighting.
- If anything does not match exactly, do not assume — confirm with a pharmacist before taking it.
Similar-Looking Pills
These pills share the same shape and colour, but are different medications — always confirm by imprint, not appearance alone.
Frequently Asked Questions
What does the pill imprinted M421 look like?
It is described as a white round pill measuring about 8, imprinted with "M421".
What is Me-PB-Hyos used for?
See the Me-PB-Hyos drug page for full usage information.
What strength is this Me-PB-Hyos pill?
This pill is PHENOBARBITAL 16.2 mg;HYOSCYAMINE SULFATE 0.1037 mg;ATROPINE SULFATE 0.0194 mg;SCOPOLAMINE HYDROBROMIDE 0.0065 mg of Me-PB-Hyos.
Who makes this pill?
It is manufactured by Method Pharmaceuticals, LLC.
Is it safe to take a pill if I cannot identify it?
No. Never take a pill you cannot positively identify. If you are unsure about a pill, do not take it — consult a pharmacist or physician, or contact Poison Control.
