Quick Answer: A white, round pill marked “K18” is an immediate-release oxycodone hydrochloride tablet containing 5 mg of oxycodone, a prescription opioid used for short-term pain. It is a Schedule II controlled substance with a high risk of dependence and overdose. Never take a K18 pill that wasn’t prescribed to you, because counterfeit pills made to look like prescription opioids can contain fentanyl.
Warning: An imprint that matches doesn’t prove a pill is real. Pills that didn’t come from a pharmacy can be counterfeit and deadly. If someone is unresponsive or breathing slowly after taking a pill, call 911 and give naloxone (Narcan) if you have it.
Oxycodone is a strong pain medication that is often used to manage pain. It comes in many different dosages and is sometimes combined with other medications like acetaminophen. These different dosages and active ingredients can affect the way the pill looks, and so can the manufacturer. Manufacturers use unique imprints, colors, and shapes to identify each pill, which helps prevent confusion and misuse.
The pill marked “K18” is one of these variations. It is small, white, round, and contains 5 mg of oxycodone hydrochloride. This article will help you understand what the K18 pill is and how it works so you can recognize its risks, especially when it’s misused or taken without a prescription.
Fact: In 2023, an estimated 12.6% of people who used oxycodone that year misused it.
K18 Pill Facts at a Glance
| Feature | Details |
|---|---|
| Imprint | K 18 (with a score line between the “K” and “18”) |
| Color and shape | White, round |
| Drug | Oxycodone hydrochloride, immediate-release |
| Strength | 5 mg |
| Drug class | Opioid pain reliever |
| DEA schedule | Schedule II |
| Typical use | Short-term treatment of moderate to severe pain |
| Manufacturer | KVK-Tech (verify against the current DailyMed label before publishing) |
| Typical duration of effect | Up to about 6 hours |
| Main risks | Dependence, addiction, slowed breathing, overdose |
What is the White K18 Pill?
White, round pills marked “K18” are immediate-release oxycodone hydrochloride tablets. They contain 5mg of oxycodone, a powerful opioid medication used for short-term pain management. Oxycodone doses are set by a prescriber and vary by person, so always follow the directions on your own prescription label. Never take more than prescribed or take it more often than directed.
Oxycodone is prescribed to treat moderate to severe pain, often after surgery or when managing chronic pain conditions. Oxycodone is a strong opioid. Pound for pound, it is stronger than hydrocodone, but much weaker than fentanyl, which is many times more potent and is the main cause of overdose deaths from counterfeit pills. Unfortunately, among patients treated with prescription opioids for chronic pain, about 3–12% may develop addiction issues.
Oxycodone works by binding to opioid receptors in the brain and spinal cord. These receptors are part of the body’s central nervous system and play a role in how the body perceives pain.
When oxycodone attaches to these receptors, it blocks pain signals from reaching the brain, which helps reduce the feeling of pain. It also triggers the release of dopamine, a chemical associated with pleasure and reward, which can create a sense of euphoria. This is one reason why oxycodone can be habit-forming if not taken as prescribed.
However, oxycodone can also be dangerous, as respiratory depression occurs in high doses. High doses can also lead to an overdose.
Only take white K18 pills if they have been prescribed to you by your doctor. Be sure to follow the directions on the label, only taking the medication when you are directed to do so. Misusing oxycodone can lead to the development of physical dependence and addiction.
Fact: In 2022, an estimated 8.7 million people aged 12 and older misused a prescription pain reliever, and about 5.0 million people had a prescription opioid use disorder.
What Does the K18 Pill Look Like?
Oxycodone 5mg often comes in a white round pill. It is scored down the middle, with a line that makes it easy to break in half. On one side of the pill, it is marked “K18,” with the “K” to the left of the scored line and “18” to the right of it. The other side is blank with a scored line down the middle.
Could a K18 Pill Be Counterfeit?
Yes, and this is one of the biggest dangers. Illicit pills are often pressed to look like real prescription tablets, including oxycodone. They may carry a familiar imprint, but contain fentanyl, methamphetamine, or other drugs, often in unpredictable amounts. Fentanyl is potent enough that a very small amount can be fatal, and a fake pill can look identical to a real one.
| Genuine pill from a pharmacy | Pill from any other source | |
|---|---|---|
| Source | Dispensed by a licensed pharmacy with a prescription label | A friend, online seller, social media, or the street |
| Contents | Matches the FDA-approved label | Unknown, and may contain fentanyl |
| Appearance | Consistent and matches the manufacturer’s description | May look identical, or have off colors, speckles, crumbling, or poor stamping |
| Safety | Safe when taken as prescribed | Unsafe, with a real risk of overdose or death |
You can’t tell by looking. A matching imprint, color, and shape are not proof. The only reliable way to know a pill is genuine is that it was dispensed to you by a licensed pharmacy. Fentanyl test strips can detect some contamination, but they are not foolproof, especially for solid pills where fentanyl may be unevenly mixed.
Common Uses for the K18 Pill
The white K18 pill (oxycodone 5 mg) is commonly used for:
- Postoperative pain – to help manage moderate to severe pain after a procedure.
- Injury-related pain – such as from broken bones, sprains, or other trauma.
- Chronic pain conditions – like arthritis, back pain, or nerve pain, when other treatments aren’t enough.
- Severe acute pain – such as after a dental procedure or a painful illness like kidney stones.
It’s typically prescribed when over-the-counter pain relievers (like ibuprofen or acetaminophen) aren’t strong enough. Because it’s a narcotic, it’s usually meant for short-term use under close supervision.
Side Effects of the K18 Pill (Oxycodone Hydrochloride)
Like all opioids, the K18 pill can cause a range of side effects. Some are mild and others are more serious. These effects can vary depending on the dose, how long you’ve been taking it, and whether it’s being used as prescribed or misused.
Common Side Effects
More common side effects of oxycodone are:
- Abdominal pain
- Severe constipation
- Nausea or vomiting
- Drowsiness
- Dizziness or lightheadedness
- Dry mouth
- Headache
- Sweating
- Itching or rash
These side effects often subside as people get used to the medication. However, if you take more than prescribed, side effects can worsen.
Adverse Effects
Some people may experience more serious side effects, especially at higher doses or with long-term use. These may include:
- Slowed or shallow breathing
- Confusion or trouble concentrating
- Low blood pressure
- Fainting
- Mood changes, such as depression or anxiety
- Trouble urinating
- Irregular heartbeat
- Seizures (rare)
- Hallucinations (more common with higher doses)
Never increase your dose of oxycodone or other opioid drugs on your own. Doing so can lead to dangerous consequences, such as an increased risk of overdose and adverse side effects.
Long-Term Risks
Oxycodone can provide almost immediate pain relief, but it can be dangerous when used long-term. Long-term use may lead to dependence and addiction, causing people to experience withdrawal symptoms when they stop taking it suddenly.
Other long-term concerns include:
- Increased sensitivity to pain (opioid-induced hyperalgesia)
- Hormonal imbalances
- Chronic constipation or bowel issues
- Risk of overdose, especially if combined with other substances
- Worsening mental health symptoms, including depression and mood swings
- Weakened immune system
How Long Do the Effects of K18 Pills Last?
The effects of the K18 pill usually last up to six hours. The pill is meant to be taken by mouth, and people begin feeling pain relief as soon as 20-30 minutes after ingesting it. The effects peak after about 1-2 hours, then gradually begin to fade.
In cases of severe pain, the K18 pill may be taken every four hours. When the effects begin wearing off, pain may return. However, it’s important to follow your doctor’s dosing instructions to avoid taking too much.
Is the K18 Pill Addictive? Evaluating Addiction Risk
Yes, oxycodone is addictive in all forms, including the K18 pill. Like other opioids, oxycodone is a Schedule II Controlled Substance, indicating a high potential for misuse along with legitimate medicinal uses.
Tolerance and Dependence
Over time, the body can develop a tolerance to oxycodone, meaning higher doses are needed to feel the same effects. This can lead to physical dependence, where the body relies on the drug to function normally. Even when taken as prescribed, long-term use can cause withdrawal symptoms if the drug is suddenly stopped.
Opioid Withdrawal Symptoms
Opioid withdrawal is typically not life-threatening, but it can be uncomfortable. Some people compare it to having the flu.
Common withdrawal symptoms include:
- Muscle aches
- Nausea or vomiting
- Anxiety or irritability
- Sweating
- Chills or goosebumps
- Runny nose and watery eyes
- Diarrhea
- Insomnia
- Cravings for the drug
Oxycodone withdrawal is best managed in a medical detox facility under professional guidance. Medications can be prescribed to minimize withdrawal symptoms.
Drug Addiction Risk Factors
Certain risk factors can make some people more susceptible to K18 pill abuse and addiction.
These include:
- A personal or family history of substance use disorders
- Mental health conditions such as depression, anxiety, or PTSD
- Long-term or high-dose opioid use
- Abuse of an opioid analgesic without a prescription
- Environmental or social factors, such as peer pressure or lack of support
- A history of trauma or abuse
K18 Pill Drug Interactions
The K18 pill contains 5 mg of oxycodone hydrochloride, which can interact with many other drugs. Some interactions can increase the risk of dangerous side effects, including slowed breathing, extreme drowsiness, or overdose. Here are the most important types of drug interactions to be aware of if you’re taking the K18 pill for pain relief or recreational purposes.
- Alcohol – Drinking alcohol while taking oxycodone can dangerously slow your breathing and heart rate, increasing the risk of coma or death. Even small amounts of alcohol can intensify oxycodone’s effects.
- Benzodiazepines – Drugs like Xanax, Ativan, or Valium are often used for anxiety or sleep, but can be deadly when combined with opioids. The combination greatly increases the risk of overdose. In fact, the CDC reports that more than 91% of benzodiazepine deaths involved opioids, and nearly 17% of opioid overdose deaths involved a benzodiazepine.
- Other opioids – Taking the K18 pill with other opioid medications or street opioids (like heroin or fentanyl) raises the risk of respiratory depression, overdose, and death.
- Muscle relaxers – These medications, such as carisoprodol (Soma) or cyclobenzaprine (Flexeril), can enhance the sedative effects of oxycodone and contribute to dangerous levels of drowsiness and slowed breathing.
- Other medications – Certain antidepressants, antipsychotics, antibiotics, antifungals, and seizure medications can affect how oxycodone is processed in your body, making it stronger or weaker and increasing side effects or withdrawal risks.
Always check with your doctor or pharmacist when taking a new medication or a new combination.
Overdose Risk and Symptoms
Opioid abuse carries significant risks, one of the most severe of which is overdose. Narcotic analgesics like oxycodone slow down breathing and can cause extreme drowsiness, especially when taken in high doses or combined with other drugs. Taking too high a dose can result in respiratory depression, a potentially life-threatening condition.
Common symptoms of oxycodone overdose include:
- Slow or stopped breathing
- Pinpoint pupils
- Unconsciousness or unresponsiveness
- Limp body
- Cold or clammy skin
- Bluish lips or fingernails
- Slow or no heartbeat
- Choking or gurgling sounds
What to Do if You Suspect an Overdose
- Call 911 right away.
- Give naloxone (Narcan) if you have it. It is safe to try and can reverse an opioid overdose. More than one dose may be needed, especially if fentanyl is involved.
- Stay with the person, even if they wake up. Naloxone can wear off in 30-90 minutes while the opioid is still active.
- If they are unconscious but breathing, place them on their side.
- If they stop breathing, start rescue breathing or CPR if you know how, following the 911 dispatcher’s instructions.
Naloxone is available over the counter at many pharmacies. Many states, including New Jersey, have Good Samaritan laws that offer some legal protection to people who call for help during an overdose.
If a child takes any opioid pill, call 911 immediately. Even a single tablet can be dangerous to a child. Store all medications locked and out of reach.
Seek medical attention right away if you or someone else has taken oxycodone or other pain medications and is experiencing signs of an overdose or difficulty breathing. You may also administer naloxone (Narcan), an opioid overdose reversal medication, if you have it, until a medical professional arrives at the scene.
Fact: In 2021, approximately 16,706 people died as a result of a prescription opioid drug overdose.
Other Opioid Pain Medications
Oxycodone isn’t the only prescription opioid that can cause physical and psychological dependence. Many other prescription opioids also come in small, white pills, so they can look similar. They’re distinguished by their unique markings, such as “K18.”
Opioids are a class of central nervous system depressants that produce pain-relieving effects.
Other common opioid pain medications include:
- Hydrocodone (often combined with acetaminophen, sold under the brand names Norco or Vicodin)
- Morphine
- Codeine
- Fentanyl (used for surgery or cancer-related pain)
- Oxymorphone (Opana)
- Hydromorphone (Dilaudid)
- Tramadol
- Buprenorphine (used both for pain and opioid addiction treatment)
These medications are typically prescribed for moderate to severe pain, but they all carry a risk of addiction, overdose, and other serious side effects, especially when combined with other central nervous system (CNS) depressants.
K18 vs. Percocet vs. M30: What’s the Difference?
| Pill | What it contains | Notes |
|---|---|---|
| K18 | Oxycodone HCl 5 mg (no acetaminophen) | Immediate-release oxycodone |
| Percocet | Oxycodone plus acetaminophen | A combination product with different imprints and strengths |
| M30 | Oxycodone HCl 30 mg (when genuine) | A higher strength, and one of the imprints most often counterfeited with fentanyl |
| Hydrocodone/acetaminophen (Norco, Vicodin) | A different opioid plus acetaminophen | Different drug, with different imprints |
A pill’s imprint identifies the manufacturer’s product, but only if the pill is genuine.
How to Identify Pills When You’re Unsure
If you’ve found a pill and aren’t sure what it is, don’t take it, and don’t give it to anyone else.
- If it came from a pharmacy, check the label and ask your pharmacist. A pharmacist can identify genuine pharmaceutical tablets and confirm they match your prescription.
- Online pill identifiers (such as Drugs.com or WebMD) can match an imprint, color, and shape to a list of possible products. They only tell you what a genuine pill with that imprint looks like. They can’t tell you whether your pill is real.
- If the pill didn’t come from a pharmacy, treat it as potentially counterfeit and dangerous, even if the imprint matches. A pharmacist can’t verify the contents of an unknown pill.
- Dispose of unknown pills safely through a DEA take-back site or pharmacy kiosk.
- If someone has taken an unknown pill, call Poison Control at 1-800-222-1222 or seek medical help. Call 911 for any signs of overdose.
Signs of Opioid Use Disorder
If you or someone you love has been misusing the K18 pill, you may be struggling with an opioid use disorder. Opioid use disorder, also called addiction, is a serious health condition characterized by uncontrollable substance abuse, intense drug cravings, and the inability to stop even when you want to.
Common signs of K18 pill addiction include:
- Taking more K18 pills than prescribed or using them more often
- Visiting multiple doctors in an attempt to get more than one prescription (doctor shopping) or buying the drugs illegally
- Difficulty cutting back or stopping despite wanting to
- Spending a lot of time thinking about, obtaining, or using opioids
- Craving the drug when not using it
- Continued use even when it causes problems at work, school, or in relationships
- Needing more of the drug to feel the same effects (tolerance)
- Feeling sick or anxious when not using (withdrawal symptoms)
- Loss of interest in hobbies or social activities
- Hiding K18 pill use or lying about how much was taken
- Mental health issues, ranging from depression and anxiety to mood swings
If these signs sound familiar to you or someone you care about, it may be time to consider treatment.
Treatment for Oxycodone Addiction
Opioid addiction is a serious condition that requires professional treatment.
Treatment may include:
- Medical detox – Medical supervision is key to a safe and effective detox. Medical detox programs have physicians and nursing staff who can prescribe medications to minimize withdrawal symptoms and provide around-the-clock care to prevent adverse effects like dehydration, high blood pressure, or severe anxiety.
- Medication-assisted treatment (MAT) – MAT uses FDA-approved medications like buprenorphine or methadone to reduce cravings and prevent withdrawal symptoms. These medications are often combined with counseling and are proven to improve long-term recovery outcomes for people who are trying to overcome opioid addiction.
- Behavioral therapies – Therapy helps individuals understand the root causes of their addiction, develop healthy coping strategies, and build motivation to stay sober. Common approaches include cognitive behavioral therapy (CBT), contingency management, and motivational interviewing.
- Holistic treatments – Many treatment centers offer holistic options like yoga, meditation, art therapy, or fitness programs. These approaches support overall well-being, reduce stress, and help individuals reconnect with their bodies and minds during recovery. Many of these therapies can also have pain-relieving effects.
- Aftercare support – Addiction recovery doesn’t end when formal treatment does. Ongoing support through sober living, outpatient programs, peer groups, or individual counseling helps prevent relapse and provides a foundation for long-term success.
If you or someone you care about is struggling with oxycodone use, you are not alone. Treatment is available, and it works when you stick to it. Reach out to Moving Mountains Recovery to take the first step.
Find Opioid Addiction Treatment at Moving Mountains Recovery
If you or someone you love is struggling with oxycodone pill addiction, the time to get help is now. At Moving Mountains Recovery, we provide comprehensive treatment for drug addiction and mental health disorders, providing our clients with a path forward.
Whether you got addicted to K18 pills after using them for chronic pain management or you bought them off the street, we’re here to help. Our treatment programs combine medical detox, behavioral therapies, and long-term support to help you safely recover. We have step-down levels of care, including partial hospitalization (PHP), intensive outpatient (IOP), and outpatient (OP), to support you at every stage of your recovery.
At Moving Mountains Recovery, we understand how serious opioid addiction is. We are passionate about helping people find freedom from their addiction and rebuild their lives on a strong foundation of recovery. Our team of healthcare professionals is dedicated to helping people find recovery. We are ready to answer any questions about opioid addiction and help where we can.
To learn more about our oxycodone addiction treatment programs or to get started with a confidential, risk-free assessment, please contact us today!
Frequently Asked Questions About the K18 Pill
What is a K18 pill?
A white, round pill marked “K18” is an immediate-release oxycodone hydrochloride tablet containing 5 mg of oxycodone. It is a prescription opioid used for short-term treatment of moderate to severe pain. It is a Schedule II controlled substance with a high risk of dependence, addiction, and overdose, and should only be taken as prescribed.
Is a K18 pill the same as Percocet?
No. K18 contains oxycodone alone, while Percocet combines oxycodone with acetaminophen. They have different imprints and are different products. Both are opioids, and both carry a risk of dependence and overdose. Always check your own prescription label and ask your pharmacist if you’re unsure.
How can you tell if a K18 pill is real or fake?
You can’t reliably tell by looking. Counterfeit pills can carry the same imprint, color, and shape as real ones. The only dependable way to know a pill is genuine is that a licensed pharmacy dispensed it to you with a prescription label. Treat any pill from another source as potentially dangerous.
Can a K18 pill contain fentanyl?
A genuine K18 pill from a pharmacy contains oxycodone, not fentanyl. But counterfeit pills made to look like K18 or other prescription opioids can contain fentanyl, often in unpredictable amounts that can be fatal. If a pill didn’t come from a pharmacy, you can’t know what it contains.
How long do the effects of a K18 pill last, and can it show up on a drug test?
The effects usually last up to about 6 hours, with pain relief starting in about 20-30 minutes. Oxycodone can be detected in urine for roughly 1-4 days, in blood for up to a day, in saliva for 1-2 days, and in hair for up to 90 days. Some standard opiate screens miss oxycodone, so a specific test may be used.
What are the signs of a K18 pill overdose, and what should I do?
Signs include slow or stopped breathing, pinpoint pupils, being unable to wake the person, blue lips or fingertips, a limp body, cold skin, and gurgling sounds. Call 911 immediately and give naloxone (Narcan) if you have it. Stay with the person, since naloxone can wear off before the opioid does.
What should I do if I or my child accidentally took a K18 pill?
If a child took any opioid pill, call 911 right away. If an adult took someone else’s pill, watch for drowsiness, slow breathing, or confusion, and call Poison Control at 1-800-222-1222 or 911 if any signs appear. Don’t wait for symptoms to worsen, especially if the person has never taken opioids before.
How is addiction to oxycodone pills like K18 treated?
Treatment can include medical detox, medication for opioid use disorder (buprenorphine, methadone, or naltrexone), behavioral therapies like CBT, and aftercare. Moving Mountains Recovery offers Partial Care, Intensive Outpatient, and Outpatient programs in New Jersey. Call (973) 453-0317, or call the SAMHSA Helpline at 1-800-662-4357.
How can I safely dispose of unused or expired K18 pills?
The best way to dispose of unused opioids is through a DEA-authorized drug take-back program or drop-off box, often available at pharmacies or police stations. If none are available, mix the pills (do not crush) with an unappealing substance like used coffee grounds or cat litter, seal them in a bag, and throw them in the trash. Always scratch out personal information on prescription labels before discarding bottles.
Can I drive or operate machinery after taking a K18 pill?
You should avoid driving or using heavy machinery after taking oxycodone, especially when starting the medication or adjusting your dose. Oxycodone can impair your reaction time and decision-making, even if you don’t feel noticeably drowsy.
Are there any alternatives to oxycodone for pain relief that are less addictive?
Yes. Depending on the type and severity of your pain, alternatives include non-opioid medications like NSAIDs (ibuprofen, naproxen), acetaminophen, antidepressants (for nerve pain), anticonvulsants (like gabapentin), or physical therapy. Always consult a healthcare provider before switching medications.
References:
- National Institute of Health (NIH): Oxycodone
- Substance Abuse and Mental Health Services Administration (SAMHSA): Key Substance Use and Mental Health Indicators in the United States: Results from the 2023 National Survey on Drug Use and Health
- U.S. Drug Enforcement Administration (DEA): Oxycodone
- National Institute on Drug Abuse (NIDA): What is the scope of prescription drug misuse in the United States?
- NIH: Label: Oxycodone Hydrochloride tablet
- JAMA Network: Effectiveness of Oxycodone Hydrochloride (Strong Opioid) vs Combination Acetaminophen and Codeine (Mild Opioid) for Subacute Pain After Fractures Managed Surgically
- Centers for Disease Control and Prevention (CDC): Trends in Nonfatal and Fatal Overdoses Involving Benzodiazepines — 38 States and the District of Columbia, 2019–2020
- Frontiers in Pharmacology: Drug Interactions With New Synthetic Opioids
- American Psychiatric Association (APA): Opioid Use Disorder
