Have a round white pill in a baggie or pillbox and you aren’t sure what it is? Trying to figure out what the loose white round pill with a numbered imprint in the bottom of your medicine drawer is?
In this guide to identifying your white round pill, we’ll go over how to identify an unknown white round pill and include some common round white pills with different imprints to help you identify your mysterious medication!
Identifying Your Round White Pill: Safety Note
Before we describe how to identify your round white pill, here are a couple of important safety notes on unidentified pills:
#1: Don’t Take a Pill If You Aren’t Sure What It Is
Unless you are absolutely, positively, 100% sure that you’ve successfully identified your white round pill, don’t take it. Taking medication when you aren’t 100% sure what you’re taking is incredibly dangerous and could even lead to death depending on what the pill is and what else you’re taking.
#2: Don’t Take Pills That Weren’t Prescribed to You
Even if you successfully identify the pill in question, what should you do if it’s not something that’s been prescribed to you? If you identify a prescription medication that wasn’t prescribed to you, don’t take it. It’s very dangerous to take pills that weren’t prescribed to you because a doctor has not assessed whether that medication is safe for you to take.
Also, it’s best to keep pills in their original bottles as much as possible so that you don’t end up with unidentified little white round pills floating around. But if you’re reading this article, it’s too late for that! Just something to keep in mind for the future.
This doesn't look like the original bottle!
3 Steps to Identifying Your Round White Pill
Here is our 3-step process to identifying your white round pill:
Step 1: Check Imprint/Pill Code
Many pills have some kind of number or letter combination imprinted on one or both sides. This is known as the imprint or the pill code.
The first thing to do is check whether there’s any kind of stamp on either side of your white round pill. If yes, note down what it is. A white round pill with an imprint will be much easier to identify than a circle white pill without one.
Step 2: Measure Pill Size
Are you dealing with a small round white pill? A medium-sized one? A big one? Measuring your pill’s exact length in millimeters will help you identify it, especially if your pill has an imprint that other, different medications also have.
Step 3: Look Up Pill
We have some common imprints (with sizes) listed in the next section of this article. (You can ctrl+F to try to find the imprint/pill code you are looking for). If the pill you’re looking for isn’t listed below, you can look up pills by size, shape, color, and imprint on the National Library of Medicine’s Pillbox site.
Note that some pills share an imprint. For example, a small round white pill with an imprint of 10 could be hyoscyamine sulfate, iloperidone, alendronate sodium, or one of several other drugs.
Knowing the size might help you narrow it down, but then again, maybe not: both hyoscyamine sulfate and alendronate sodium come in 5 mm pills. The pictures of the pills are slightly different, but not all the pills in Pillbox have pictures.
If you can’t determine definitively what the pill is, don’t take it, and follow safe disposal practices per the FDA.
Get out that ruler and get ready to measure!
Common Round White Pills
In this section, we’ll go over common white round pills by imprint or pill code. We’ll also give a size, identify the drug and what it’s for, and list what else the medication is sold as. We've included an image of the pill from Pillbox when an image is available.
Pill codes that identify the same or similar drugs are grouped together.
Round White Pill AN 627
Tramadol hydrochloride. Source: Pillbox.
Size: 9 mm
What it is: Tramadol hydrochloride 50 mg
What it’s for: Prescription-only opioid pain reliever for moderate to severe pain
Also sold as: Ultram
Round White Pill 319
Size: 9 mm
What it is: Tramadol hydrochloride 50 mg
What it’s for: Prescription-only opioid pain reliever for moderate to severe pain
Also sold as: Ultram
Round White Pill 512
Oxycodone and acetaminophen. Source: Pillbox.
Size: 12 mm
What it is: Oxycodone 5 mg / Acetaminophen 325 mg
What it’s for: Prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Percocet, Endocet, Roxicet
Round White Pill A349
Size: 12 mm
What it is: Oxycodone 5 mg / Acetaminophen 325 mg
What it’s for: Prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Percocet, Endocet, Roxicet
Round White Pill 54 543
Roxicet oxycodone and acetaminophen. Source: Pillbox.
Size: 11 mm
What it is: Oxycodone 5 mg / Acetaminophen 325 mg; this particular imprint is the brand-name Roxicet
What it’s for: Prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Percocet, Endocet
Round White Pill IP 203
Size: 11 mm capsule
What it is: Oxycodone 5 mg / Acetaminophen 325 mg
What it’s for: Prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Percocet, Endocet, Roxicet
Round White Pill K 18
Size: 6 mm
What it is: Oxycodone hydrochloride 5 mg
What it’s for: A prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Roxicodone, Endocodone, Percolone, Oxaydo
Round White Pill 4810 V
Oxycodone hydrochloride. Source: Pillbox.
Size: 6 mm
What it is: Oxycodone hydrochloride 5 mg
What it’s for: A prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Roxicodone, Endocodone, Percolone, Oxaydo
Round White Pill OP 10
OxyContin 10 mg oxycodone. Source: Pillbox.
Size: 7 mm
What it is: 10 mg extended-release oxycodone hydrochloride; this imprint in particular is OxyContin
What it’s for: Prescription-only opioid/narcotic pain reliever for moderate to severe pain
Also sold as: Authorized generic Oxycodone ER.
Round White Pill 44 159
Size: 13 mm
What it is: Acetaminophen 250 MG / Aspirin 250 MG / Caffeine 65 MG
What it’s for: Over-the-counter pain reliever primarily for migraines and menstrual cramps
Also sold as: Excedrin Extra Strength, Excedrin Tension Headache, Excedrin Menstrual Complete, Bayer Migraine Formula, Pamprin
Round White Pill PLIVA 433
Trazodone hydrochloride. Source: Pillbox.
Size: 9 mm
What it is: Trazodone hydrochloride 50 mg
What it’s for: A prescription-only serotonin modulator and stimulator (SMS) antidepressant; also prescribed for insomnia
Also sold as: Desyrel
Round White Pill M 4
Hydromorphone hydrochloride. Source: Pillbox.
Size: 7 mm
What it is: Hydromorphone hydrochloride 4 mg
What it’s for: Prescription-only opioid/narcotic painkiller
Also sold as: Dilaudid
Round White Pill APO TI-4
Tizanidine hydrochloride. Source: Pillbox.
Size: 8 mm.
What it is: Tizanidine hydrochloride 4 mg
What it’s for: Prescription-only muscle relaxant; also prescribed for migraines, as a sleep aid, and as an anticonvulsant
Also sold as: Zanaflex, Sirdalud
Round White Pill G 2011
Orphenadrine Citrate. Source: Pillbox.
Size: 9 mm
What it is: Orphenadrine citrate 100 mg
What it’s for: Extended-release prescription-only muscle relaxant used to treat muscle spasms and pain
Also sold as: Norflex Extended-Release
Round White Pill GPI A325
Acetaminophen. Source: Pillbox.
Size: 10 mm
What it is: Acetaminophen 325 mg
What it’s for: Over-the-counter painkiller
Also sold as: Tylenol
Round White Pill 10 M
Size: 7 mm
What it is: Methylphenidate hydrochloride 10 mg
What it’s for: A prescription-only stimulant used to treat ADHD and sometimes narcolepsy
Also sold as: Ritalin
Round White Pill Watson 241 1
Lorazepam. Source: Pillbox.
Size: 7 mm
What it is: Lorazepam 1 mg
What it’s for: Prescription-only anti-anxiety medication of the benzodiazepine class.
Also sold as: Ativan, Temesta
Round White Pill M 15
Diphenoxylate hydrochloride and atropine sulfate. Source: Pillbox.
Size: 6 mm
What it is: Diphenoxylate hydrochloride 2.5 mg / Atropine sulfate 0.025 mg
What it’s for: Prescription-only opioid used to treat diarrhea; atropine is included to discourage misuse
Also sold as: Lomotil
Round White Pill G 4
Ondansetron. Source: Pillbox.
Size: 7 mm
What it is: Ondansetron 4 mg
What it’s for: Prescription-only nausea/vomiting treatment, primarily prescribed for chemotherapy or post-surgery
Also sold as: Zofran
Round White Pill W 921
Cefuroxime axetil. Source: Pillbox.
Size: 11 mm
What it is: Cefuroxime axetil 250 mg
What it’s for: Prescription-only antibiotic used to treat a variety of bacterial infections.
Also sold as: Ceftin
Round White Pill W 929
Lisinopril. Source: Pillbox.
Size: 8 mm
What it is: Lisinopril 10 mg
What it’s for: Prescription-only ACE inhibitor used to treat high blood pressure.
Also sold as: Zestril, Prinivil
Identifying Your Round White Pill: The Bottom Line
Is your unidentified white pill round? In this article, we went over how to identify a white round pill with an imprint or pill code.
First it’s important to note that if you can’t identify what your small round white pill is definitively, you shouldn’t take it. You also shouldn’t take a circle white pill if it’s prescription-only and something that wasn’t prescribed to you.
Here’s our three-step process to identifying your little round white pill:
#1: Check the imprint/code (the combination of letters and numbers found on one or both sides of the pill).
#2: Measure the pill’s size in mm.
#3: Check the rest of the article for common pill codes and imprints, or look on Pillbox if it’s not listed. Note that multiple medicines may share the same pill code and even the same size. If you can’t definitively identify your pill, don’t take it.
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Have friends who also need help with test prep? Share this article!
Ellen has extensive education mentorship experience and is deeply committed to helping students succeed in all areas of life. She received a BA from Harvard in Folklore and Mythology and is currently pursuing graduate studies at Columbia University.
Holly R.
