Question 1

What is Naltrexone?

Accepted Answer

Naltrexone is a medication classified as an opioid antagonist. It works by binding to opioid receptors in the brain, which blocks the physical effects and sensations typically produced by opioids and alcohol.

The medication is used as a supportive tool within comprehensive treatment programs to help manage substance use. It functions by neutralizing the body's response to these substances without causing a high or being habit-forming itself.

Question 2

What is Naltrexone used for?

Accepted Answer

Naltrexone is used to treat:

Alcohol dependence

Opioid dependence (relapse prevention after detoxification)

Question 3

How does Naltrexone work?

Accepted Answer

Mechanism of Action

Naltrexone is classified as an opioid antagonist. It works by attaching to opioid receptors in the brain and blocking them. This action serves two primary purposes depending on the condition being treated:

For Opioid Use Disorder: By blocking the receptors, naltrexone prevents opioid drugs (such as heroin or prescription painkillers) from producing a "high" or feelings of euphoria. If a person uses opioids while taking naltrexone, they will not feel the typical effects of the drug.

For Alcohol Use Disorder: The exact way naltrexone works for alcohol is not fully established, but it is believed to interact with the brain's reward system. It helps reduce the urge or craving to drink and may make the consumption of alcohol feel less rewarding.

Naltrexone is not a narcotic and does not cause physical dependence. It does not treat withdrawal symptoms; instead, it works by preventing the pleasurable effects of opioids and alcohol to help support long-term recovery.

Question 4

What are the brand names for Naltrexone?

Accepted Answer

Naltrexone is sold under the brand names ReVia , Vivitrol , and Depade .

Question 5

What are the active ingredients in Naltrexone?

Accepted Answer

The active ingredient in Naltrexone is naltrexone .

Question 6

What are the side effects of Naltrexone?

Accepted Answer

Common side effects of Naltrexone may include:

Nausea

Headache

Dizziness

and others.

Always consult with a healthcare professional about potential side effects.

Question 7

What drug class is Naltrexone?

Accepted Answer

Naltrexone belongs to the opioid antagonist drug class.

Question 8

What is the dosage of Naltrexone and how do I take it?

Accepted Answer

How to Take Naltrexone

Naltrexone is available in two forms: an oral tablet and an extended-release injectable suspension. The method of administration depends on the form prescribed by your healthcare provider.

Oral Tablets

The oral tablets are taken by mouth. They can be taken with or without food. If the medication causes stomach upset, taking it with food or antacids may help. It is important to follow the specific schedule provided by your doctor, as the frequency of doses can vary.

Injectable Form

The injectable form is an extended-release medication administered by a healthcare professional. It is given as an injection into the muscle of the buttocks, usually once every four weeks or once a month. This medication must be administered by a medical professional and should not be self-injected.

Missed Doses

If you are taking the oral tablets and miss a dose, take it as soon as you remember. If it is nearly time for your next dose, skip the missed dose and return to your regular schedule. Do not take two doses at once to make up for a missed one.

If you miss an appointment for the injectable form, contact your healthcare provider right away to reschedule the injection as soon as possible.

Question 9

Is Naltrexone safe during pregnancy and breastfeeding?

Accepted Answer

Pregnancy

There is limited information regarding the safety of naltrexone in pregnant women. In animal studies, high doses of the medication were associated with an increased risk of early pregnancy loss. Because well-controlled human studies are lacking, naltrexone is generally only recommended during pregnancy if the clinical need clearly justifies the potential risk to the fetus.

If you are pregnant or planning to become pregnant, discuss your treatment options with your healthcare provider to weigh the risks and benefits.

Breastfeeding

Naltrexone and its active metabolites are excreted into human breast milk. The effects of this exposure on a nursing infant are not well understood. Due to the potential for side effects in the infant, healthcare providers may recommend either stopping breastfeeding or stopping the medication, depending on the mother's medical needs.

It is important to consult with a clinician to evaluate the risks to the infant versus the benefits of the medication for the mother.

Question 10

What forms and strengths does Naltrexone come in?

Accepted Answer

Naltrexone is provided in the following formulations:

Oral Tablet: This form is taken by mouth.

Extended-Release Injectable Suspension: This is a long-acting formulation administered as an intramuscular injection by a healthcare professional.

Question 11

What is the FDA approval status of Naltrexone?

Accepted Answer

FDA Approved Indications

Naltrexone is approved by the U.S. Food and Drug Administration (FDA) for the following uses:

Alcohol Dependence: To help patients maintain abstinence from alcohol and reduce cravings.

Opioid Dependence: To prevent relapse following opioid detoxification. It is intended for patients who have been opioid-free for a minimum of 7 to 10 days.

The medication is available in two primary forms: a daily oral tablet and a long-acting injectable suspension administered once a month by a healthcare professional.

Boxed Warning and Safety Information

The oral form of naltrexone carries a boxed warning regarding the risk of liver injury (hepatotoxicity). This risk is primarily associated with high doses of the medication. Healthcare providers typically perform liver function tests before starting treatment and monitor them periodically thereafter. Naltrexone is not recommended for patients with acute hepatitis or liver failure.

There is also a significant regulatory focus on the risk of opioid overdose. Because naltrexone blocks opioid receptors, patients may attempt to overcome the blockade by taking large amounts of opioids, which can lead to fatal respiratory depression. Furthermore, patients have a lower tolerance for opioids after stopping naltrexone, increasing the risk of overdose if they return to previous levels of drug use.

Regulatory Classification

Naltrexone is a prescription medication but is not classified as a controlled substance. Unlike other medications used for opioid use disorder, such as methadone or buprenorphine, naltrexone does not have a potential for abuse or physical dependence.

Question 12

What should I know about Naltrexone and withdrawal?

Accepted Answer

Precipitated Withdrawal

Naltrexone is an opioid antagonist that blocks the effects of narcotics. If you have opioids in your body when you take naltrexone, it will cause sudden and severe withdrawal symptoms. This is called precipitated withdrawal and can be life-threatening.

To prevent this, you must be completely opioid-free for at least 7 to 14 days before your first dose. This includes avoiding medications like methadone, buprenorphine, and tramadol. Symptoms of precipitated withdrawal can include:

Nausea, vomiting, or diarrhea

Stomach cramps

Muscle aches and joint pain

Anxiety, nervousness, or irritability

Sweating, fever, or chills

Confusion or hallucinations

Discontinuing Naltrexone

Naltrexone is not habit-forming and does not cause physical dependence. Therefore, you will not experience withdrawal symptoms if you stop taking the medication.

It is important to note that after stopping naltrexone, you may be more sensitive to the effects of opioids. If you resume opioid use at the same doses you used in the past, there is a high risk of a fatal overdose because your body has lost its previous tolerance during treatment.

Naltrexone

Medication Quick Facts

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How It Works

Brand Names

Side Effects

Warnings & Precautions

Dosage & How to Take

Pregnancy & Breastfeeding

Forms & Strengths

FDA / Regulatory Status

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FAQ

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