Phentermine tablet appearance varies by dose and manufacturer
Phentermine tablets come in different shapes, sizes, and colors depending on the dose strength and which pharmaceutical company made them. The most common phentermine tablets are round or oblong, and they range from white to yellow to blue. A 37.5 mg tablet is often white or off-white and round. A 15 mg tablet is typically blue and round. A 30 mg tablet may be white, yellow, or orange depending on the brand. Because multiple manufacturers produce phentermine under different brand names, the same dose can look different from one pharmacy to another.
The tablet will have an imprint stamped on one or both sides. This imprint includes numbers, letters, or a combination of both that identifies the dose, the manufacturer, and sometimes the brand name. For example, a tablet marked "K 25" contains 25 mg of phentermine and was made by King Pharmaceuticals. A tablet marked "ADIPEX-P 37.5" is the brand-name version at 37.5 mg. You can look up any imprint on a pill identifier website or ask your pharmacist to confirm what you have received.
Key Takeaways
- Phentermine tablets are round or oblong and come in white, yellow, blue, or orange, with the color and shape depending on the dose strength.
- Every tablet has an imprint—numbers, letters, or both—that identifies the manufacturer, dose, and sometimes the brand name.
- The same dose from different manufacturers will look different, so the imprint is the only reliable way to confirm what you have.
- You can verify any tablet's identity using a pill identifier tool online or by asking your pharmacist.
Common phentermine doses and their typical appearance
Phentermine is prescribed in several standard doses, and each has a recognizable look. The 15 mg dose is usually a small blue round tablet. The 30 mg dose is often a white or yellow round tablet, slightly larger than the 15 mg version. The 37.5 mg dose is typically a white or off-white round tablet and is the most commonly prescribed strength. Some manufacturers also produce extended-release capsules instead of tablets, which are larger and come in clear or opaque shells filled with beads or powder.
Brand-name Adipex-P tablets are usually white and round with the imprint "ADIPEX-P" followed by the dose number. Generic versions from manufacturers like Sandoz, Lannett, or King Pharmaceuticals will have different imprints but the same active ingredient. If your tablet does not match the description of the dose your doctor prescribed, or if the imprint does not match what your pharmacy records show, contact your pharmacist before taking it.
How to read the imprint on your tablet
The imprint on a phentermine tablet is a series of characters that serves as a permanent identifier. It tells you the manufacturer, the dose, and sometimes the brand. Imprints are always stamped into the tablet during manufacturing and will not wear off. On a round tablet, the imprint may be on one side or split across both sides. On an oblong tablet, it typically runs along the length of the tablet.
To read an imprint, hold the tablet up to the light and look at both sides. Write down exactly what you see—including numbers, letters, and any symbols like slashes or dashes. Then visit a pill identifier website such as Drugs.com or Pill Identifier, enter the imprint exactly as it appears, and the tool will return the drug name, dose, and manufacturer. Your pharmacist can also read the imprint and confirm the contents in seconds. Never assume a tablet is what you think it is based on color or shape alone.
Differences between brand-name and generic phentermine tablets
Brand-name phentermine is sold under the name Adipex-P and is manufactured by specific companies under license. Generic phentermine is the same active ingredient but made by other manufacturers and sold under their own names or as unbranded generics. The active drug is identical, but the tablets look different because each manufacturer uses its own imprint, shape, and color scheme.
Some people report that they prefer one version over another, though the active ingredient is the same. Differences in how quickly the tablet dissolves or how the inactive ingredients are formulated can sometimes affect how a person feels, but the phentermine itself is chemically identical. If you switch from one manufacturer to another and notice a change in how the medication works, mention it to your doctor or pharmacist. They can check whether the new version has different inactive ingredients or a different release profile.
Extended-release phentermine capsules versus tablets
Phentermine comes in both when ready-release tablets and extended-release capsules. when ready-release tablets are taken once or twice daily and work quickly. Extended-release capsules are taken once daily in the morning and release the medication slowly throughout the day. Extended-release capsules are larger than tablets and come in clear or opaque shells, usually white and blue or all white, filled with tiny beads or powder.
The most common extended-release version is Adipex-P, which comes in a clear capsule with white and blue halves. Inside you will see small white or colored beads. If your prescription says "extended-release" or "ER" and you receive a small round tablet instead, contact your pharmacy because you may have received the wrong formulation. The imprint on an extended-release capsule will usually include "ER" or "XR" to indicate the release type.
What to do if your tablet does not match your prescription
If the tablet you received does not look like what you expected, or if the imprint does not match your dose, do not take it. Instead, contact your pharmacy right away. Bring the bottle with you or have the imprint information ready. Your pharmacist can look up the imprint in their system and tell you when ready whether the correct medication was dispensed or whether there was an error.
Pharmacy errors are rare but do happen. The pharmacist may have filled the wrong prescription, or the wrong bottle may have been placed in your bag. Catching this before you take the medication is important. If the pharmacy confirms that the tablet is correct but looks different from what you expected, ask them to explain why—it may straightforward be that your insurance switched you to a different generic manufacturer this month.
Storing phentermine tablets safely
Phentermine tablets should be stored in a cool, dry place in their original bottle with the label intact. The label shows the imprint, dose, and expiration date. Keep the bottle tightly closed and away from moisture, heat, and direct sunlight. Do not transfer tablets to a pill organizer or other container unless you are certain you can keep track of which tablet is which.
If you use a pill organizer, write the imprint and dose on each compartment before filling it, or fill it only for a few days at a time so you can refer back to the original bottle if you have questions. Phentermine tablets can degrade if exposed to humidity or heat, and a damaged or discolored tablet should not be taken. If a tablet looks cracked, discolored, or different from when you first received it, ask your pharmacist whether it is still safe to use.
Frequently Asked Questions
What does a 37.5 mg phentermine tablet look like?
A 37.5 mg phentermine tablet is usually white or off-white and round. The imprint varies by manufacturer—common imprints include "ADIPEX-P 37.5", "K 25", or "PHENTERMINE 37.5". The exact appearance depends on which company made it, so always check the imprint to confirm the dose.
Can phentermine tablets be different colors?
Yes. Phentermine tablets come in white, yellow, blue, and orange depending on the dose and manufacturer. A 15 mg tablet is often blue, a 30 mg may be yellow or white, and a 37.5 mg is usually white. The color is not a reliable way to identify the dose—always read the imprint.
How do I know if my phentermine tablet is real?
Check the imprint against your prescription and your pharmacy records. Use a pill identifier tool online or ask your pharmacist to confirm the imprint matches the dose you were prescribed. If the imprint does not match or you cannot find it in a pill identifier, contact your pharmacy when ready.
What if my phentermine looks different than last time?
Your insurance or pharmacy may have switched you to a different generic manufacturer. The active ingredient is the same, but the tablet looks different because it was made by a different company. Check the imprint to confirm it is the correct dose, and ask your pharmacist why it looks different.
Are phentermine capsules and tablets the same?
They contain the same active ingredient but work differently. Tablets are when ready-release and work quickly. Capsules are extended-release and work slowly throughout the day. If your prescription says extended-release and you received a tablet, contact your pharmacy because you may have the wrong formulation.