Learn More About Your Medication

• It is used to manage pain when non-opioid pain drugs do not treat your pain well enough or you cannot take them.

• If you are allergic to this drug; any part of this drug; or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.

• If you have any of these health problems: Lung or breathing problems like asthma, trouble breathing, or sleep apnea; high levels of carbon dioxide in the blood; or stomach or bowel block or narrowing.

• If you are taking any of these drugs: Buprenorphine, butorphanol, linezolid, methylene blue, nalbuphine, or pentazocine.

• If you have taken certain drugs for depression or Parkinson's disease in the last 14 days. This includes isocarboxazid, phenelzine, tranylcypromine, selegiline, or rasagiline. Very high blood pressure may happen.

This is not a list of all drugs or health problems that interact with this drug.

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this drug with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

• Tell all of your health care providers that you take this drug. This includes your doctors, nurses, pharmacists, and dentists.

• Avoid driving and doing other tasks or actions that call for you to be alert until you see how this drug affects you.

• To lower the chance of feeling dizzy or passing out, rise slowly if you have been sitting or lying down. Be careful going up and down stairs.

• If you have been taking this drug for a long time or at high doses, it may not work as well and you may need higher doses to get the same effect. This is known as tolerance. Call your doctor if this drug stops working well. Do not take more than ordered.

• Long-term or regular use of opioid drugs like this drug may lead to dependence. Lowering the dose or stopping this drug all of a sudden may cause a greater risk of withdrawal or other severe problems. Talk to your doctor before you lower the dose or stop this drug. You will need to follow your doctor’s instructions. Tell your doctor if you have more pain, mood changes, thoughts of suicide, or any other bad effects.

• Do not take with alcohol or products that have alcohol. Unsafe and sometimes deadly effects may happen.

• Avoid taking other products that have acetaminophen in them. Check labels closely. Too much acetaminophen may cause liver problems.

• Follow the directions exactly. Do not take more acetaminophen in a day than directed. If you do not know how much acetaminophen you can take in a day, ask your doctor or pharmacist. Some people may take up to 4,000 mg (milligrams) in a day if told to do so by the doctor. Some people (like people with liver problems and children) should take less acetaminophen. Call your doctor right away if you have taken too much acetaminophen in a day, even if you feel well.

• Call your doctor right away if you have signs of liver problems like dark urine, tiredness, decreased appetite, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.

• Long-term use of an opioid drug may lead to lower sex hormone levels. Call your doctor if you have a lowered interest in sex, fertility problems, no menstrual period, or ejaculation problems.

• Taking an opioid drug like this drug may lead to a rare but severe adrenal gland problem. Call your doctor right away if you feel very tired or weak, you pass out, or you have severe dizziness, very upset stomach, throwing up, or decreased appetite.

• This drug may raise the chance of seizures in some people, including people who have had seizures in the past. Talk to your doctor to see if you have a greater chance of seizures while taking this drug.

• If you are 65 or older, use this drug with care. You could have more side effects.

• Tell your doctor if you are breast-feeding. This drug passes into breast milk and may harm your baby. Get medical help right away if your baby seems very sleepy, is limp, or has trouble breathing.

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

• Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat. Rarely, some allergic reactions have been life-threatening.

• Signs of low blood sugar like dizziness, headache, feeling sleepy, feeling weak, shaking, a fast heartbeat, confusion, hunger, or sweating.

• Severe dizziness or passing out.

• Clammy skin.

• Sweating a lot.

• Feeling confused.

• Trouble walking.

• Severe constipation or stomach pain. These may be signs of a severe bowel problem.

• Hearing loss.

• Change in hearing.

• Chest pain or pressure.

• Fast or slow heartbeat.

• Trouble breathing, slow breathing, or shallow breathing.

• Noisy breathing.

• Breathing problems during sleep (sleep apnea).

• Fever, chills, or sore throat; any unexplained bruising or bleeding; or feeling very tired or weak.

• Mood changes.

• Trouble passing urine.

• Change in how much urine is passed.

• Change in eyesight.

• Seizures.

• Severe skin reactions have happened with this drug. These have included Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and other severe skin reactions. Sometimes these have been deadly. Get medical help right away if you have signs like red, swollen, blistered, or peeling skin; other skin irritation (with or without fever); red or irritated eyes; or sores in your mouth, throat, nose, or eyes.

• A severe and sometimes deadly problem called serotonin syndrome may happen if you take this drug with certain other drugs. Call your doctor right away if you have agitation; change in balance; confusion; hallucinations; fever; fast or abnormal heartbeat; flushing; muscle twitching or stiffness; seizures; shivering or shaking; sweating a lot; severe diarrhea, upset stomach, or throwing up; or severe headache.

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

• Constipation.

• Upset stomach or throwing up.

• Stomach pain or heartburn.

• Feeling dizzy, sleepy, tired, or weak.

• Headache.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.

Use this drug as ordered by your doctor. Read all information given to you. Follow all instructions closely.

• Take by mouth only.

• Take with or without food. Take with food if it causes an upset stomach.

• Do not inject or snort this drug. Doing any of these things can cause very bad side effects like trouble breathing and death from overdose.

• Do not take more than what your doctor told you to take. Do not take more often or for longer than you were told. Doing any of these things may raise the chance of severe side effects.

• Do not take this drug with other strong pain drugs or if you are using a pain patch without talking to your doctor first.

• If your pain gets worse, if you feel more sensitive to pain, or if you have new pain after you take this drug, call your doctor right away. Do not take more than ordered.

• This drug may affect certain lab tests. Tell all of your health care providers and lab workers that you take this drug.

• If you take this drug on a regular basis, take a missed dose as soon as you think about it.

• If it is close to the time for your next dose, skip the missed dose and go back to your normal time.

• Do not take 2 doses at the same time or extra doses.

• Many times this drug is taken on an as needed basis. Do not take more often than told by the doctor.

• Store at room temperature in a dry place. Do not store in a bathroom.

• Store this drug in a safe place where children cannot see or reach it, and where other people cannot get to it. A locked box or area may help keep this drug safe. Keep all drugs away from pets.

• Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

• If your symptoms or health problems do not get better or if they become worse, call your doctor.

• Do not share your drugs with others and do not take anyone else's drugs.

• This drug comes with an extra patient fact sheet called a Medication Guide. Read it with care. Read it again each time this drug is refilled. If you have any questions about this drug, please talk with the doctor, pharmacist, or other health care provider.

• A drug called naloxone can be used to help treat an overdose of this drug. Talk with your doctor or pharmacist about how to get or use naloxone. If you think there has been an overdose, get medical care right away even if naloxone has been used. Be ready to tell or show what was taken, how much, and when it happened.

• If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

This generalized information is a limited summary of diagnosis, treatment, and/or medication information. It is not meant to be comprehensive and should be used as a tool to help the user understand and/or assess potential diagnostic and treatment options. It does NOT include all information about conditions, treatments, medications, side effects, or risks that may apply to a specific patient. It is not intended to be medical advice or a substitute for the medical advice, diagnosis, or treatment of a health care provider based on the health care provider's examination and assessment of a patient's specific and unique circumstances. Patients must speak with a health care provider for complete information about their health, medical questions, and treatment options, including any risks or benefits regarding use of medications. This information does not endorse any treatments or medications as safe, effective, or approved for treating a specific patient. UpToDate, Inc. and its affiliates disclaim any warranty or liability relating to this information or the use thereof. The use of this information is governed by the Terms of Use, available at https://www.wolterskluwer.com/en/know/clinical-effectiveness-terms.