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Naltrexone

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Molecule Summary

Uses
Treatment of Alcohol dependence, Opioid dependence.
Therapy
Deaddiction
Side Effects
Nausea, Vomiting, Insomnia, Anxiety, Restlessness, Joint pain, Muscle pain.
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Molecule Description

Naltrexone is a prescription medicine mainly used to treat opioid dependence and alcohol dependence.

Uses

  • Treatment of Alcohol dependence
  • Treatment of Opioid dependence

Contraindications

When should one not use Naltrexone

  • If you are allergic to any component of Naltrexone.
  • If you have suicidal thoughts.
  • If you are pregnant or breastfeeding.
  • If you are below 18 years of age.
  • If you have severe renal impairment.
  • If you have severe hepatic impairment.
  • If you have acute hepatitis.
  • If you are currently using opioid medicines or are in opioid withdrawal.

Side effects

Common side effects of this drug are:

  • Nausea
  • Vomiting
  • Insomnia (difficulty in sleeping)
  • Anxiety
  • Restlessness
  • Joint pain
  • Muscle pain

Precautions and Warnings

Pregnancy

Pregnancy

Naltrexone is not recommended for pregnant women. Limited studies have shown an increased risk of severe side effects in newborns. Consult your doctor for evaluating the risks and benefits of your condition.

Breast Feeding

Breast Feeding

Naltrexone is not recommended during breastfeeding. It may get excreted into breast milk and can affect the baby. Consult your doctor and discuss the potential risks and benefits of this medicine. Your doctor may advise you to discontinue breastfeeding or prescribe low doses if you continue breastfeeding.

Driving

Driving

Naltrexone may cause side effects that could affect your driving ability. The medicine may decrease alertness, affect your vision, and cause dizziness and lightheadedness. Avoid driving if you are experiencing the side effects mentioned above after taking this medicine.

Alcohol

Alcohol

No, do not consume alcohol with Naltrexone, as it increases the severity of side effects like dizziness, drowsiness, lethargy, blurred vision, liver injury, etc. It also worsens the symptoms for which you are using this medicine.

Other General Warnings

Other General Warnings

Talk to your doctor if
  • You experience any severe side effects.
  • You are pregnant or planning to conceive or breastfeeding.
  • Your symptoms do not improve, or there is worsening of your condition.
  • You have severe liver impairment.
  • You have renal impairment.
  • You are taking prescription and non-prescription medications, herbal products, vitamins and nutritional supplements or plan to take as there is a chance of interaction.

Mode of Action

How Does It Work?

Naltrexone belongs to the class of medications called 'opioid-antagonist'. This medicine works by blocking the effect of opioid receptors. Thus, resulting in blocking the euphoric and sedative effects of opioids and alcohol, decreasing cravings and urges to use alcohol or opioids.

Interactions

Interactions with other medicines

  • Interaction with high dose opioids with Naltrexone can lead to life-threatening opioid poisoning from respiratory and circulatory impairment.
  • Interaction with Methadone in substitution treatment increases the risk of the onset of withdrawal syndrome.
  • Interaction with antidepressants (amitriptyline, doxepin, trimipramine), antipsychotic (thioridazine), antibiotics (clarithromycin), anti-rheumatic (leflunomide), sedative (droperidol), Opioid (codeine), Central antihypertensives, (alpha-methyldopa) etc., can also cause some severe side effects.

Interactions with food items

  • You can continue with the usual diet as food doesn't influence the effect of Naltrexone. Speak with your doctor about any supplements or herbal drinks you are currently taking before using this medicine.

Dosage

Overdose

Overdose of Naltrexone can lead to toxicity or poisoning. Symptoms of overdose include nausea, vomiting, seizures and respiratory failure. Seek emergency medical treatment or contact your doctor immediately if you experience these symptoms.

Missed a Dose

Missed doses of Naltrexone should be taken right away unless it is almost time for the next dose. In that case, you should skip the forgotten dose (rather than taking a double dose) or call your doctor for further instructions. Do not take both doses at once as it can lead to overdose.

Frequently Asked Questions (FAQs)

No, you should not take opioid analgesics with Naltrexone, as it may lead to interaction and may cause severe adverse effects.

No, Naltrexone should not be used in children and adolescents under 18 years of age, since clinical data in this age group are lacking. Safety data in children has not been established yet.

No, do not take Naltrexone more than the recommended dose as it may lead to overdose or may worsen your condition. Consult your doctor if you have any queries about the doses, and do not increase the dose on your own.

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