The M523 pill is a prescription opioid pain medication that contains oxycodone hydrochloride 10 mg and acetaminophen 325 mg. It is a white, capsule-shaped or oblong tablet marked with “M523” on one side and “10/325” on the other. This medication is commonly used for pain that is severe enough to require an opioid when other treatment options are not sufficient.
Because the M523 pill contains oxycodone, it carries serious risks, including misuse, dependence, addiction, overdose, and life-threatening breathing problems. Oxycodone and acetaminophen combination medications are controlled substances and should only be taken exactly as prescribed by a licensed medical professional.
Quick Info: M523 Pill
| Category | Details |
|---|---|
| Pill imprint | M523 on one side, 10/325 on the other |
| Generic name | Oxycodone hydrochloride and acetaminophen |
| Common brand comparison | Similar active ingredients as Percocet |
| Strength | Oxycodone 10 mg / acetaminophen 325 mg |
| Drug class | Opioid analgesic combination |
| Controlled substance? | Yes, Schedule II |
| Common use | Moderate to severe pain when an opioid is medically appropriate |
| Opioid ingredient | Oxycodone |
| Non-opioid ingredient | Acetaminophen |
| Addiction risk | High, especially with misuse or long-term use |
| Overdose risk | Yes, especially with alcohol, benzodiazepines, other opioids, or counterfeit pills |
| Counterfeit risk | Pills sold outside a licensed pharmacy may contain fentanyl or other dangerous substances |
| Emergency warning signs | Slow breathing, blue lips, extreme sleepiness, choking sounds, or loss of consciousness |
| What to do in an overdose | Call 911 and give naloxone if available |
What Does the M523 Pill Contain?
The M523 10/325 pill contains two active ingredients:
- Oxycodone hydrochloride: Oxycodone is an opioid pain reliever that affects the central nervous system. It changes how the brain and body respond to pain, but it can also produce relaxation, sedation, and euphoria. These effects are part of why oxycodone has a high potential for misuse.
- Acetaminophen: Acetaminophen is a non-opioid pain reliever and fever reducer. It is also found in many over-the-counter medications. Taking too much acetaminophen can damage the liver, especially when combined with alcohol or other medications that also contain acetaminophen.
The “10/325” imprint means the pill contains 10 mg of oxycodone and 325 mg of acetaminophen. This is a stronger oxycodone dose than some other combination pain pills, such as 5/325 formulations.
Is the M523 Pill the Same as Percocet?
The M523 pill contains the same active ingredients found in many forms of Percocet: oxycodone and acetaminophen. However, “Percocet” is a brand name, while M523 is an imprint used to identify a specific generic version of oxycodone/acetaminophen.
Even if a pill looks like a known prescription medication, appearance alone does not guarantee that it is real. Counterfeit pills may be made to look like prescription opioids but can contain fentanyl, nitazenes, xylazine, or other dangerous substances.
What Is the M523 Pill Used For?
The M523 pill may be prescribed for moderate to severe pain when a healthcare provider determines that an opioid medication is appropriate. This may include certain cases of post-surgical pain, injury-related pain, or other acute pain conditions.
Opioids are generally intended to be used carefully and for the shortest appropriate period of time. Taking more than prescribed, taking it more often than directed, mixing it with other substances, or using it without a prescription can greatly increase the risk of overdose and addiction.
Is the M523 Pill Addictive?
Yes, the M523 pill can be addictive because it contains oxycodone. Oxycodone is an opioid that can cause physical dependence, tolerance, cravings, and compulsive use. Dependence can occur even when someone takes the medication as prescribed, especially with repeated use over time.
Addiction is not simply “liking” a medication or needing pain relief. Opioid addiction, also called opioid use disorder, may involve:
- Loss of control over opioid use
- Continued use despite consequences
- Cravings
- Withdrawal symptoms
- Taking opioids in ways that were not prescribed or intended
- Spending significant time seeking, using, or recovering from opioids
Signs of possible oxycodone misuse may include:
- Taking extra doses
- Running out of medication early
- Using someone else’s prescription
- Crushing, snorting, or injecting pills
- Mixing pills with alcohol or sedatives
- Hiding use from loved ones
- Mood changes
- Frequent drowsiness or sedation
- Becoming preoccupied with getting more medication
M523 Pill Side Effects
The M523 pill can cause side effects even when taken as prescribed. Common side effects may include:
- Drowsiness
- Dizziness
- Nausea
- Vomiting
- Constipation
- Sweating
- Itching
- Headache
- Lightheadedness
More serious side effects can include:
- Slowed breathing
- Confusion
- Extreme sedation
- Low blood pressure
- Fainting
- Allergic reactions
- Liver injury from acetaminophen
- Opioid overdose
Oxycodone can cause serious or life-threatening breathing problems, especially when a person first starts taking it, takes a higher dose, or combines it with other depressants.
M523 Pill Overdose Risk
An M523 pill overdose is a medical emergency. Because the pill contains oxycodone, overdose may cause:
- Slow, shallow, or stopped breathing
- Blue or gray lips or fingernails
- Choking, snoring, or gurgling sounds
- Cold or clammy skin
- Extreme sleepiness
- Limp body
- Confusion
- Pinpoint pupils
- Loss of consciousness
The risk of overdose increases when oxycodone is taken with:
- Alcohol
- Benzodiazepines
- Sleep medications
- Muscle relaxers
- Other opioids
- Other sedating substances
Counterfeit pills increase the danger even more because the person may not know what substance or dose they are actually taking.
Naloxone, often known by the brand name Narcan, can reverse opioid overdose temporarily and should be used immediately if an opioid overdose is suspected. Emergency medical help is still necessary after naloxone because its effects can wear off before the opioid leaves the body.
Fake M523 Pills and Fentanyl Risk
One of the biggest dangers today is that a pill sold as “M523,” “Percocet,” “oxy,” or another prescription opioid may be counterfeit. Counterfeit medicines may contain:
- The wrong ingredient
- Too much active ingredient
- Too little active ingredient
- No active ingredient
- Fentanyl or other synthetic opioids
- Other harmful substances
The DEA has continued warning that fake prescription pills may contain fentanyl. Its One Pill Can Kill campaign reports large seizures of fentanyl-laced counterfeit pills and emphasizes that even a very small amount of fentanyl can be deadly.
A person should never take an M523 pill unless it came directly from a licensed pharmacy and was prescribed to them. Pills purchased online, from friends, from social media, or from the street cannot be trusted based on appearance alone.
M523 Pill Withdrawal Symptoms
Someone who takes oxycodone regularly may experience withdrawal symptoms when they reduce or stop use. Opioid withdrawal symptoms may include:
- Anxiety
- Muscle aches
- Sweating
- Nausea
- Vomiting
- Diarrhea
- Insomnia
- Chills
- Runny nose
- Watery eyes
- Restlessness
- Stomach cramps
- Strong cravings
While opioid withdrawal is not always life-threatening by itself, it can become dangerous when dehydration, relapse, polysubstance use, or underlying medical conditions are involved. The risk of returning to use after withdrawal is also serious because tolerance may drop, making overdose more likely.
Medical detox and opioid addiction treatment can help people withdraw more safely and begin recovery with support.
Treatment for M523 Pill Addiction
If someone is struggling with M523 pill misuse or oxycodone addiction, treatment can help. Opioid use disorder is a medical condition, not a moral failure. Many people begin taking prescription opioids for real pain and later find themselves unable to stop without help.
At Sanctuary Treatment Center, treatment may involve a personalized combination of clinical care, therapy, relapse prevention, mental health support, and medication-assisted treatment when appropriate. The goal is not just to stop opioid use, but to help each person understand the patterns, pain, trauma, stress, and mental health symptoms that may be connected to substance use.
Treatment may help with:
- Managing opioid cravings
- Addressing withdrawal safely
- Treating anxiety, depression, trauma, or co-occurring disorders
- Building relapse prevention skills
- Repairing family and relationship strain
- Creating a long-term recovery plan
- Learning healthier ways to manage pain, stress, and emotions
Recovery from oxycodone addiction is possible with the right support. If M523 pills, Percocet, oxycodone, fentanyl, or other opioids have become difficult to control, reaching out for help can be the first step toward stability.
When to Get Help
It may be time to seek help if you or someone you love is:
- Taking M523 pills without a prescription
- Taking more than prescribed
- Mixing pills with alcohol or other substances
- Feeling unable to stop
- Experiencing withdrawal symptoms
- Hiding opioid use
- Continuing to use despite consequences
- Worried about counterfeit pills
- Using opioids to cope with emotional pain, stress, or trauma
Emergency help is needed immediately if someone is:
- Difficult to wake
- Breathing slowly
- Turning blue or gray
- Making choking or gurgling sounds
- Suspected of overdosing
FAQ: What Is the M523 Pill?
What is the M523 pill?
The M523 pill is a white oblong prescription tablet containing oxycodone hydrochloride 10 mg and acetaminophen 325 mg. It is used for pain management when an opioid medication is considered medically appropriate.
Is M523 a Percocet?
M523 is a generic oxycodone and acetaminophen pill with the same active ingredients found in Percocet. Percocet is a brand name, while M523 is an imprint used to identify a specific generic tablet.
Is the M523 pill an opioid?
Yes. The M523 pill contains oxycodone, which is an opioid pain medication. Because of this, it has risks of dependence, addiction, respiratory depression, and overdose.
Can the M523 pill get you high?
Oxycodone can produce euphoria, relaxation, or sedation, especially when misused. Using M523 to get high is dangerous and increases the risk of addiction, overdose, and death.
What does M523 10/325 mean?
The imprint means the pill contains 10 mg of oxycodone hydrochloride and 325 mg of acetaminophen.
Can you overdose on M523?
Yes. Overdose can happen if someone takes too much oxycodone, mixes it with alcohol or other sedatives, or takes a counterfeit pill containing fentanyl or another potent substance. Opioid overdose can cause slowed breathing, unconsciousness, and death.
Is it safe to take an M523 pill from a friend?
No. A person should only take prescription opioids that were prescribed to them and filled by a licensed pharmacy. Pills from friends, online sellers, or the street may be counterfeit or contaminated.
What should I do if I think someone overdosed on M523?
Call 911 immediately, give naloxone if available, and stay with the person until help arrives. If they are not breathing normally or cannot be woken up, treat it as a medical emergency.
Sources
Drugs.com. (n.d.). M523 10/325 pill: White, capsule/oblong, 16mm. https://www.drugs.com/imprints/m523-10-325-19855.html
U.S. Food and Drug Administration. (2025). Counterfeit medicine. https://www.fda.gov/drugs/buying-using-medicine-safely/counterfeit-medicine
U.S. Drug Enforcement Administration. (2026). One Pill Can Kill. https://www.dea.gov/onepill
MedlinePlus. (2026). Oxycodone: Drug information. U.S. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a682132.html
MedlinePlus. (2026). Oxycodone combination products: Drug information. U.S. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a601007.html