Reviewed by Dr. Diana Rangaves, PharmD, RPh
Finding an unfamiliar pill with 512 printed on it can be worrying, especially when you do not know where it came from or whether it is safe to take. People searching for the 512 pill often want fast answers: Is it oxycodone? Is it Percocet? What strength is it? Could it be fake? These questions matter because 512 is not a unique drug imprint. The commonly identified white, round, scored 512 tablet is about 12 mm in diameter and contains oxycodone hydrochloride 5 mg and acetaminophen 325 mg, but other medicines can also carry the number 512.
A number alone is not enough to identify an unknown pill safely. The complete imprint, color, shape, size, score line, active ingredients, and source of the tablet all matter. This guide also explains the main safety concerns linked to the white round 512 pill, including side effects, drug interactions, dependence, counterfeit pills, fentanyl risk, and overdose warning signs. If you are holding an unknown tablet, do not take it simply because it looks similar to an image online.
What Is a 512 Pill?
When people search for a white round pill with 512 on it, they are often referring to an oxycodone and acetaminophen combination tablet. This specific version contains 5 mg of oxycodone hydrochloride and 325 mg of acetaminophen and is white, round, scored, and about 12 mm in diameter.
Oxycodone is an opioid pain medicine, while acetaminophen is a non-opioid pain reliever and fever reducer. The two ingredients work differently, but both contribute to pain relief. The medicine also carries important risks, including addiction, misuse, overdose, breathing problems, and liver injury.
Still, “512” should not be treated as the name of a medicine. Different drugs can share the same numeric imprint, which is why other physical features are important.
How to Identify the White Round 12 mm Tablet
The oxycodone/acetaminophen tablet has several physical and medication details that should match before it is identified as the commonly searched white 512 product.
| Identification Feature | White Round 512 Tablet |
|---|---|
| Imprint | 512 |
| Color | White |
| Shape | Round |
| Size | About 12 mm |
| Score line | Yes |
| Oxycodone hydrochloride | 5 mg |
| Acetaminophen | 325 mg |
| Route | Oral |
| Availability | Prescription only |
| Controlled-substance status | Schedule II |
Matching only the number 512 is not enough. The other features should match as well.
Why the Complete Pill Imprint Matters
A pill imprint can contain numbers, letters, logos, or symbols on one or both sides. Additional letters, symbols, or markings can identify a completely different medication, even when the number 512 appears somewhere in the imprint.
When identifying an unknown tablet, compare the complete imprint, color, shape, approximate size, score line, markings on the reverse, original packaging, and pharmacy source. If these details do not match, do not assume the tablet contains oxycodone.
Does Every Pill Marked 512 Contain Oxycodone?
No. Not every pill marked 512 contains oxycodone.
A white, round 9 mm tablet marked 512 can contain chlorpromazine 100 mg. This version is unscored and has no print on the reverse side, making it physically different from the larger white, scored oxycodone/acetaminophen tablet.
Another 512 tablet is yellow, round, and about 8 mm in size. It can contain meloxicam 7.5 mg, a nonsteroidal anti-inflammatory drug (NSAID) that is completely different from oxycodone.
The brown to pale-brown, oval 15 mm version marked 512 can contain divalproex sodium delayed release 250 mg. This medicine is also unrelated to oxycodone.
| Appearance | Possible Medication | Strength |
|---|---|---|
| White, round, about 12 mm, scored | Oxycodone + acetaminophen | 5 mg / 325 mg |
| White, round, about 9 mm, unscored | Chlorpromazine | 100 mg |
| Yellow, round, about 8 mm | Meloxicam | 7.5 mg |
| Brown to pale-brown, oval, about 15 mm | Divalproex sodium delayed release | 250 mg |
This table shows important examples, but it is not a complete list of every medicine or longer imprint containing the numbers 512.
What Is in the White Round 12 mm Tablet?
The white, round, scored version contains two active medicines: oxycodone hydrochloride 5 mg and acetaminophen 325 mg.
Oxycodone 5 mg
Oxycodone is an opioid pain reliever. It acts on opioid receptors in the brain and nervous system and changes how the body responds to pain.
Because oxycodone affects the central nervous system, it can also cause drowsiness, dizziness, slowed breathing, physical dependence, misuse, addiction, and overdose. Serious breathing problems can occur even when the medicine is used as directed, especially when treatment begins, the dose changes, or other sedating substances are involved.
Readers who want to compare another tablet containing oxycodone can also review the M 05 52 pill guide.
Acetaminophen 325 mg
Acetaminophen is a non-opioid pain reliever and fever reducer. It may also appear as APAP on medication labels.
Taking more than one acetaminophen-containing product at the same time can increase the risk of accidental overdose and serious liver injury. People using this combination medicine should check other prescription and over-the-counter products for both “acetaminophen” and “APAP.”
Difference Between Oxycodone and Acetaminophen
Oxycodone and acetaminophen are not the same type of medicine. Oxycodone is an opioid, while acetaminophen is a non-opioid pain reliever.
Their safety risks are also different. Oxycodone can cause dangerously slow breathing, dependence, misuse, and overdose. Too much acetaminophen can cause severe liver damage.
What Is Oxycodone/Acetaminophen Used For?
Oxycodone and acetaminophen tablets are used for pain severe enough to require an opioid when other treatment options are inadequate. Opioids are not intended to be the first choice for every type of pain because the risks can include misuse, addiction, overdose, and life-threatening breathing problems.
The medicine should only be used by the person for whom it was prescribed. Sharing an opioid prescription can be dangerous, especially for children or people who are not used to opioids. Accidental ingestion can also lead to a fatal overdose.
Recognizing a pill’s appearance does not mean someone should use it to treat pain on their own.
How Does the White Round 512 Pill Make You Feel When Taken as Prescribed?
The intended effect of oxycodone/acetaminophen is pain relief. However, because oxycodone acts on the nervous system, some people may also feel sleepy, dizzy, lightheaded, or less alert.
The medicine can also affect judgment, coordination, and the ability to perform activities that require full attention. People should know how it affects them before driving or operating machinery.
How Strong Is the White Round 12 mm 512 Pill?
The specific white, round, scored 512 tablet contains 5 mg of oxycodone hydrochloride and 325 mg of acetaminophen.
However, describing an opioid as simply “weak” or “strong” can be misleading. A person’s response depends on factors such as previous opioid exposure, age, health conditions, other medications, and individual sensitivity.
A person should never take additional tablets because the medication does not feel strong enough. Dose changes should be discussed with the healthcare professional managing the prescription.
How Long Does Oxycodone/Acetaminophen Take to Work and Last?
There is no exact timing that applies to every person. Immediate-release oxycodone/acetaminophen can begin providing pain relief within the first hour, but the exact onset and duration vary between people.
The oxycodone component of the 5 mg/325 mg tablet has an average elimination half-life of about 3.5 hours after a single oral dose. A half-life is not the same as the time it takes to start working or the exact length of pain relief.
Age, metabolism, liver and kidney function, other medicines, and previous opioid exposure can affect how a person responds. Patients should follow their prescribed schedule rather than taking another dose early because the effect seems to be wearing off.
Side Effects of Oxycodone/Acetaminophen
Oxycodone and acetaminophen can cause both mild and serious side effects.
Possible side effects include:
- Drowsiness
- Dizziness
- Lightheadedness
- Nausea
- Vomiting
- Constipation
- Tiredness
- Headache
- Abdominal discomfort
- Itching
Some of these effects are reported more often than others. They may also become more serious when oxycodone is combined with substances that slow the brain and nervous system.
Severe Side Effects
One of the most serious opioid risks is respiratory depression, which means breathing becomes dangerously slow, weak, or stops.
Seek urgent medical help for warning signs such as:
- Very slow or difficult breathing
- Extreme sleepiness
- Inability to wake
- Loss of consciousness
- Severe confusion
- Collapse
Acetaminophen can also cause severe liver injury when too much is taken, especially when several acetaminophen-containing products are used together.
Drug Interactions With Oxycodone/Acetaminophen
Oxycodone can interact with many medicines and substances. Some combinations increase sedation and breathing problems, while others change the amount of oxycodone in the bloodstream.
Patients should tell their doctor or pharmacist about all prescription medicines, over-the-counter products, vitamins, and supplements they use.
What Happens When You Mix the 512 Pill With Alcohol?
Alcohol and oxycodone both slow the central nervous system. Combining them can increase the risk of severe drowsiness, reduced awareness, breathing problems, coma, overdose, and death. Alcohol can also increase liver concerns linked to acetaminophen.
Is It Dangerous to Mix the 512 Pill With Benzodiazepines?
Yes. Combining opioids with benzodiazepines can cause profound sedation, respiratory depression, coma, and death. Substances that slow the brain and nervous system can create similar risks.
Other Important Drug Interactions
Other medicines that may interact with oxycodone include gabapentin, pregabalin, other opioids, sedatives, sleeping medicines, muscle relaxants, some antidepressants, medicines that affect serotonin, and MAO inhibitors.
Some medicines can also affect a liver enzyme called CYP3A4, which helps the body process oxycodone. These interactions may raise or lower oxycodone levels in the blood and can change the risk of side effects, breathing problems, reduced pain relief, or withdrawal.
Precautions
Oxycodone and acetaminophen may not be suitable for everyone. Extra care may be needed for people with serious breathing problems, liver or kidney disease, a blockage in the stomach or intestines, seizure disorders, or other health conditions that increase opioid-related risks.
Pregnancy and breastfeeding also require medical guidance. Extended opioid use during pregnancy can cause withdrawal in a newborn, while oxycodone and acetaminophen can pass into breast milk.
Who Should Be Extra Careful?
Older adults and people with lung, liver, kidney, neurological, or digestive-system problems may require closer monitoring. Anyone taking other sedating medicines should also discuss possible interactions with a healthcare professional.
Because the medicine can cause sleepiness or dizziness, driving or operating heavy machinery should be avoided until the person knows how the medication affects them.
Safe Storage and Disposal
Oxycodone/acetaminophen should be stored securely, out of sight and reach of children, and in a place that is not easily accessible to other people. It should never be shared with another person.
Unused or expired opioid medication should be disposed of promptly. A medication take-back program is a good option when one is available; otherwise, follow the disposal instructions provided with the medicine or by a pharmacist.
Addiction, Physical Dependence, Tolerance, and Opioid Use Disorder
The white oxycodone/acetaminophen 512 tablet contains a Schedule II opioid. Oxycodone can cause misuse, addiction, physical dependence, and overdose, even when it was originally prescribed for a medical reason.
Misuse means using the medication differently from how it was prescribed. Tolerance means the body becomes less responsive to the same amount of the drug over time. Physical dependence means the body has adapted to the medicine and may develop withdrawal symptoms if it is stopped suddenly. These conditions can occur during opioid treatment and do not automatically mean a person has opioid use disorder.
Opioid use disorder, or OUD, is a medical condition that can involve loss of control over opioid use, strong cravings, continued use despite harm, and difficulty stopping. Anyone worried about their opioid use should speak with a qualified healthcare professional.
Can Oxycodone Be Stopped Suddenly?
A person who may be physically dependent on oxycodone should not suddenly stop or rapidly reduce the medicine without medical guidance. Abrupt discontinuation can cause withdrawal and a return or worsening of pain.
Possible withdrawal symptoms can include:
- Restlessness
- Anxiety
- Sweating
- Runny nose
- Muscle aches
- Nausea
- Vomiting
- Diarrhea
- Abdominal cramps
- Trouble sleeping
- Changes in heart rate or blood pressure
A healthcare professional may create an individual reduction plan based on the person’s dose, treatment length, medical history, and other factors.
Can Counterfeit Oxycodone Pills Be Identified by Appearance?
Not reliably. Counterfeit prescription pills sold as oxycodone can closely resemble legitimate medication. Matching the expected imprint, shape, and color can help show what a genuine tablet should look like, but it cannot prove what is actually inside an unknown pill.
Can a Counterfeit Oxycodone Pill Contain Fentanyl?
Counterfeit pills sold as oxycodone can contain illicit fentanyl or other unexpected substances. This does not mean every unknown tablet marked 512 contains fentanyl, but pills from unverified sources can be dangerous because their actual contents may not match their appearance.
For more background on the risks linked to illicit fentanyl, see The Fentanyl Crisis.
Why the Source of the Pill Matters
Prescription medication is safest when it comes from a legitimate prescription filled by a licensed pharmacy. A pill obtained from a street seller, social-media contact, unknown website, or another unverified source should not be assumed genuine just because the imprint and color look correct.
Oxycodone/Acetaminophen Overdose
An oxycodone overdose is a medical emergency because opioids can slow or stop breathing. Overdose-reversal medicines such as naloxone can temporarily reverse opioid effects, but emergency medical care is still required.
Signs and Symptoms of an Opioid Overdose
Possible warning signs include:
- Very slow, weak, or stopped breathing
- Extreme sleepiness or inability to wake
- Loss of consciousness
- Pinpoint pupils
- Blue or gray lips or skin
- Limp body
- Snoring, choking, or gurgling sounds
These symptoms should be treated as an emergency.
What to Do During a Suspected Overdose
Contact your local emergency services immediately if an opioid overdose is suspected. Give naloxone if it is available. If there is no response or normal breathing has not returned after about 2–3 minutes, another dose may be needed according to the product instructions. Stay with the person until emergency help arrives.
Naloxone’s effect is temporary, so a person who responds to it still needs emergency medical evaluation.
What Should You Do If You Find an Unknown 512 Pill?
Do not swallow an unknown tablet because it looks similar to an online image. First, check the entire imprint and both sides of the pill. Compare its color, shape, size, score line, packaging, and source.
A white, scored 12 mm tablet marked 512 may contain oxycodone/acetaminophen 5/325 mg, while a smaller white 9 mm version may contain chlorpromazine 100 mg. A yellow 8 mm 512 tablet may contain meloxicam 7.5 mg, and a brown to pale-brown oval 15 mm 512 tablet may contain divalproex sodium delayed release 250 mg.
If an unknown pill has already been swallowed, contact your local poison information service or another qualified medical professional promptly, even if severe symptoms have not appeared yet. If the person has trouble breathing, collapses, has a seizure, or cannot be awakened, contact your local emergency services immediately.
FAQs
Is the White Round Tablet the Same as Percocet?
The white, round 12 mm tablet marked 512 contains oxycodone 5 mg and acetaminophen 325 mg. Percocet products also contain oxycodone and acetaminophen, but the 512 imprint identifies a generic oxycodone/acetaminophen tablet rather than proving that the pill is branded Percocet.
Does the White Round Tablet Contain Oxycodone or Hydrocodone?
The white, round, scored 12 mm tablet marked 512 contains oxycodone hydrochloride 5 mg and acetaminophen 325 mg. It does not contain hydrocodone. However, other medicines can also carry the imprint 512, so the full appearance must match.
How Long Can Oxycodone Stay in Your System?
There is no exact detection time that applies to everyone. The oxycodone component has an average elimination half-life of about 3.5 hours after a single oral dose, but complete elimination takes longer.
Drug-test detection can also vary by test type, dose, frequency of use, metabolism, and liver or kidney function. The half-life should not be used to predict an exact drug-test result.
Does a Score Line Mean the Tablet Can Be Split?
The oxycodone/acetaminophen 5/325 mg product marked 512 is a scored tablet, so the groove is one physical feature that helps identify it.
However, a score line does not automatically mean a prescription tablet should be split. Follow the prescription instructions or ask a pharmacist.
Conclusion
The most important rule with a 512 pill is simple: the number alone is not enough to identify an unknown tablet safely. The commonly identified white, round, scored version is about 12 mm in diameter and contains oxycodone hydrochloride 5 mg and acetaminophen 325 mg, but white chlorpromazine, yellow meloxicam, and brown to pale-brown divalproex sodium tablets can also carry the same imprint.
Accurate pill identification depends on checking the complete imprint, color, shape, size, score line, and trusted source of the medication together. Just as importantly, matching a legitimate pill’s appearance does not prove that an unknown tablet is authentic, because counterfeit prescription pills can closely copy genuine products.
If you are unsure about this pill, do not guess or take it based on appearance alone; confirm it with a pharmacist. If someone has already taken an unknown pill and develops dangerously slow breathing, severe sleepiness, collapse, or cannot be awakened, treat it as an emergency and contact your local emergency services immediately.
References
- DailyMed – Oxycodone and Acetaminophen 5 mg/325 mg, Imprint 512
- DailyMed – Chlorpromazine 100 mg, Imprint 512
- DailyMed – Meloxicam 7.5 mg, Imprint 512
- DailyMed – Divalproex Sodium Delayed Release 250 mg, Imprint 512
- FDA – Acetaminophen Safety
- DEA – One Pill Can Kill
- CDC – Naloxone and Opioid Overdose
Medical Disclaimer: This article is for educational purposes only and does not replace advice from a doctor, pharmacist, poison specialist, or other qualified healthcare professional. Never take an unknown medication based only on an online description or image.