What happens if I miss a dose?

Take the medication as soon as you remember. If it is almost time for the next dose, skip the missed dose and wait until your next regularly scheduled dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include nausea, stomach pain, dizziness, or seizure (convulsions).

What should I avoid while using naltrexone oral?

Naltrexone oral can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. Do not use narcotic drugs or alcohol while taking naltrexone oral. Never try to overcome the effects of the medication by taking large doses of narcotic drugs or alcohol. Doing so could result in dangerous effects, including coma and death. Ask your doctor before using any prescription or over-the-counter medicine to treat a cold, cough, diarrhea, or pain while taking naltrexone oral. These medicines may contain narcotics or alcohol.

What are the possible side effects of naltrexone oral?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using naltrexone oral and call your doctor at once if you have any of these serious side effects:

blurred vision or eye problems;
fast heartbeat;
mood changes, hallucinations (seeing or hearing things), confusion, thoughts of hurting yourself;
nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
ear pain, ringing in your ears;
skin rash or itching; or
wheezing, difficulty breathing.

Less serious side effects may include:

feeling anxious, nervous, restless, or irritable;
feeling light-headed, fainting;
increased thirst;
muscle or joint aches;
weakness or tiredness;
sleep problems (insomnia); or
decreased sex drive, impotence, or difficulty having an orgasm.

This is not a complete list of side effects and others may occur. Tell your doctor about any side effect that seems unusual or that is especially bothersome.

What other drugs will affect naltrexone oral?

The pain-relieving effects of any narcotic pain medications you use will be blocked if you use them during your treatment with naltrexone oral. Harmful side effects could also occur.

Before using naltrexone, tell your doctor if you use any of the following drugs:

buprenorphine (Buprenex, Subutex);
butorphanol (Stadol);
codeine (Tylenol with codeine);
hydrocodone (Lortab, Vicodin);
dezocine (Dalgan);
hydromorphone (Dilaudid);
levorphanol (Levo-Dromoran);
meperidine (Demerol);
methadone (Dolophine, Methadose);
morphine (Kadian, MS Contin, Roxanol);
nalbuphine (Nubain);
nalmefene (Revex);
naloxone (Narcan);
oxycodone (OxyContin, Roxicodone, Percocet);
oxymorphone (Numorphan); or
propoxyphene (Darvon, Darvocet).

This list it not complete and there may be other drugs that can interact with naltrexone oral. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about naltrexone.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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