There is no single “white pill.” White is the most common color for both prescription and over-the-counter medications, so a white pill could be anything from regular acetaminophen to a prescription pain reliever to an allergy tablet. The only reliable way to identify a specific white pill is by reading the letters, numbers, or symbols stamped on its surface, then looking them up.
Every prescription and over-the-counter drug sold in the United States is required by the FDA to carry a unique imprint code. That code, combined with the pill’s size, shape, and color, identifies exactly what the medication is, what dose it contains, and who manufactured it. If you’ve found a white pill and want to know what it is, the imprint is your answer.
How to Read a Pill’s Imprint Code
Look closely at both sides of the pill. You’ll see letters, numbers, a logo, or some combination stamped into or raised on the surface. These markings are either debossed (pressed into the pill), embossed (raised above the surface), or printed with ink. Write down everything you see on both sides.
Some pills also have a score line, which is a shallow groove running across one face. That line indicates the tablet is designed to be split into smaller doses. The score line itself isn’t part of the identification code, but the numbers or letters near it are.
If the pill has a logo with no accompanying letters or numbers, identification gets harder. Logos alone are less effective identifiers, which is why the FDA encourages manufacturers to include at least one letter or number alongside any symbol.
Common White Pills and Their Imprints
Hundreds of medications come in white. Here are some of the most frequently searched white pills and what they actually contain:
- L484 (white, oblong): Acetaminophen 500 mg, a common over-the-counter pain reliever
- L612 (white, oval): Loratadine 10 mg, a non-drowsy allergy medication
- 4H2 (white, oval): Cetirizine 10 mg, another over-the-counter allergy drug
- L194 (white, round): Famotidine 20 mg, an acid reflux reducer
- M365 (white, oblong): Acetaminophen 325 mg with hydrocodone 5 mg, a prescription pain medication
- 512 (white, round): Acetaminophen 325 mg with oxycodone 5 mg, a prescription pain medication
- M 3 (white, round): Acetaminophen 300 mg with codeine 30 mg, a prescription pain medication
Notice that several of the most common white pills are prescription opioid painkillers. This is one reason identifying an unknown white pill matters. What looks like a harmless over-the-counter tablet could be a controlled substance.
Why So Many Pills Are White
White is essentially the default. The active ingredient in most tablets is combined with inactive fillers, binders, and coatings, many of which are naturally white or off-white. Adding color requires an extra manufacturing step and additional inactive ingredients, so generic manufacturers in particular often skip it.
U.S. trademark law actually plays a role here too. Generic drugs cannot look exactly like the brand-name version they copy. They must contain the same active ingredient at the same strength, but the color, shape, and flavoring can differ. So when a brand-name drug is blue or pink, its generic equivalent often ends up white simply because it needs to look different. This is why the same medication can appear as a white pill from one manufacturer and a colored pill from another.
How to Look Up an Unknown White Pill
The fastest method is an online pill identifier. The Drugs.com Pill Identifier and the National Library of Medicine’s database both let you type in the imprint code and filter by color and shape. Start with just the imprint code. If too many results come up, narrow your search by selecting “white” and the pill’s shape (round, oval, oblong, etc.).
If the pill has a logo you can’t type, enter any accompanying letters or numbers and substitute the word “Logo” where the symbol appears. Most databases recognize this workaround.
You can also contact the FDA’s Division of Drug Information directly. Email a description of the pill, including its color, shape, size, and all visible markings, to [email protected]. Staff there can identify drugs based on physical appearance. This isn’t an emergency service, though. If someone has taken an unknown pill and you’re concerned about poisoning, call the Poison Control Center at 1-800-222-1222.
When a Pill Has No Imprint
If a white pill has absolutely no markings, it is not an FDA-regulated prescription or OTC medication. It could be a dietary supplement, a vitamin, a foreign medication, or something illicit. Supplements and vitamins are not required to carry imprint codes under federal law. Neither are homeopathic products beyond a basic manufacturer identifier.
A completely blank white pill cannot be reliably identified by appearance alone. Without lab testing, there is no safe way to determine what it contains. If you find an unmarked pill and need to know what’s in it, a pharmacist may be able to help narrow down possibilities based on size and texture, but they cannot confirm the contents without the imprint.