Revia (Naltrexone) Shopper Approved

Prescription Prescription Required FormationFormulation: Tablet


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Prescription Prescription Required FormationFormulation: Tablet


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Revia is an orally administered medication used to treat alcohol and opioid dependence. It contains the active ingredient naltrexone. Naltrexone belongs to a class of drugs called opiate antagonists, which work in the brain to prevent opiate effects such as pain relief and feelings of well-being. In addition to blocking these effects, Revia also reduces the desire to take opiates.

Revia is a special narcotic drug that blocks the effects of other narcotic medicines and alcohol used to treat narcotic drug or alcohol addiction and is taken orally in tablet form. It is often used in combination with other treatments, such as counseling and support groups, to help people overcome their addiction.

Uses and Dosage

Revia is an oral tablet that should be taken by mouth with or without food, usually 50 milligrams once daily, or as directed by your doctor. In some cases, a health care professional may watch you take the medication as part of a program and may order a higher dose of 100-150 milligrams to be taken every 2-3 days to make it easier to schedule clinic visits. If stomach upset occurs, this medication may be taken with food or antacids.

Before starting naltrexone, a urine test should be done to check for recent opiate drug use. Your doctor may also give you another medication, known as a naloxone challenge test, to check for opiate use. Do not use any opiates for at least 7 days before starting naltrexone, and you may need to stop certain opiate drugs, such as methadone, for 10 to 14 days before starting naltrexone.

The dosage of Revia is based on a patient's medical condition and response to treatment. Doctors may start patients at a lower dose and monitor them for side effects or withdrawal symptoms before increasing their dosage. Patients should take tablets as directed and should not increase their dose, take it more frequently, or stop taking it without their doctor's approval.

To get the most benefit from Revia, patients should use it regularly and take it at the same time every day. They should inform their doctor if they start using drugs or alcohol again.

Side Effect

Common Side Effects of Revia (Naltrexone):

  • Anxiety
  • Decreased sex drive
  • Difficulty having an orgasm
  • Fainting
  • Impotence
  • Increased thirst
  • Irritability
  • Lightheadedness
  • Muscle or joint aches
  • Nervousness
  • Restlessness
  • Sleep problems (insomnia)
  • Tiredness
  • Weakness

Serious Side Effects of Revia (Naltrexone):

  • Abdominal cramps
  • Abdominal or stomach pain
  • Allergic reaction
  • Cramping
  • Dark urine
  • Depression
  • Diarrhea
  • Joint/bone/muscle aches
  • Mental/mood changes (e.g., anxiety, confusion, extreme sleepiness, visual hallucinations)
  • Nausea or vomiting
  • Runny nose
  • Suicidal thoughts or behaviors
  • Unusual tiredness or weakness
  • Vomiting
  • White bowel movements
  • Yellowing of the skin or eyes.

Form and Strength

Revia (Naltrexone) is available in the following forms and strength:

Revia: Tablet

  • 50 mg

Naltrexone: Tablet

  • 50 mg


  • Naltrexone can cause liver damage or worsen existing liver problems, so it is not recommended for people with liver disease.
  • Naltrexone can cause sudden opioid withdrawal in people who are still physically dependent on opioids. It is important to be opioid-free for at least 7-10 days before starting naltrexone.
  • Naltrexone may not be safe for people with certain medical conditions, such as kidney disease or a bleeding disorder. You should discuss your medical history with your doctor before taking naltrexone.
  • Some people may be allergic to naltrexone, and may experience symptoms such as hives, difficulty breathing, or swelling of the face or throat. If you experience any of these symptoms, seek medical attention immediately.
  • Naltrexone may be harmful to a developing fetus and could be passed through breast milk to a nursing infant. Discuss your pregnancy or breastfeeding status with your doctor before taking naltrexone.
  • Talk to your doctor before taking Revia if you are pregnant or planning to become pregnant. Revia is classified as a Pregnancy Category C medication, which means the potential benefits and risks should be considered before use.
  • Naltrexone may worsen symptoms of depression or other mental health problems in some people. If you experience any changes in mood, behavior, or thinking while taking naltrexone, contact your doctor right away.
  • Naltrexone may interact with other medications, including opioids and certain antidepressants. Be sure to tell your doctor about all medications, supplements, or herbal products you are taking before starting naltrexone.

Frequently Asked Questions (FAQ)

Is Revia safe for everyone?

Revia may not be safe for everyone, especially if you have liver or kidney disease or if you are allergic to naltrexone. Talk to your doctor before taking Revia to make sure it is safe for you.

Can Revia be taken with other medications?

Revia may interact with other medications, so tell your doctor about all the medications you are taking, including prescription, over the counter, and herbal supplements.

Can Revia be used to treat opioid addiction?

Yes, naltrexone (the active ingredient in Revia) can be used to treat opioid addiction. It works by blocking the effects of opioids in the brain, which can help reduce cravings and prevent relapse.

How long should someone take Revia for?

The length of treatment with Revia will vary depending on the individual and their specific condition. Your doctor will discuss a treatment plan with you and may monitor your progress throughout your course of treatment.


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Online Pharmacies Canada has provided information from third parties intended to increase awareness and does not contain all the information about Revia (Naltrexone). Talk to your doctor or other qualified medical practitioners for medical attention or advice, or if you have any concerns about Revia (Naltrexone).