Naltrexone is used to help people stay off heroin or other opioids after having been weaned off from them.
It can also be used to help you reduce the desire to drink alcohol.
Naltrexone may be used for other conditions. Check with your healthcare professional if you are unsure why you are given this medication.
Do not give your tablets to people who are dependent on opioids as they could cause life-threatening withdrawal symptoms. If this happens, call 995 at once.
IMPORTANT: Do not take Naltrexone if you have taken heroin or other opioids in the past 7-10 days.
Doing so may result in unpleasant, and sometimes severe withdrawal symptoms within minutes of taking naltrexone. Withdrawal symptoms include:
Be sure that your family or caregiver are also aware of the above symptoms so they can call your doctor if you are unable to seek treatment on your own.
Inform your healthcare professional if:
Carry an identification card stating that you are taking naltrexone. This serves as an alert to medical personnel in the event of an emergency.
Avoid drinking alcohol while taking Naltrexone.
Do not take heroin or other opioids while taking Naltrexone. Naltrexone blocks the “high” feeling you get from these drugs. Any attempts to overcome the effect of naltrexone by consuming higher doses of the drugs may lead to an opioid overdose.
Avoid taking opioid-based medications such as certain anti-diarrhoeal preparations, codeine-based cough medications or strong pain-killers.
The mentioned side effects generally affect up to 10% of patients.
Most of the side effects listed here will improve with time. Speak with your doctor if any of them continues, worsens or affects your daily life.
The symptoms of a drug allergy include one or more of the following:
Rarely this medication may cause:
If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.
Store in a cool and dry place, away from direct sunlight. Keep this medication away from children.
Pack this medication into a trash bag and seal it tightly before throwing into the rubbish chute or bin.
Disclaimers
Please take note that the above is not a complete list of all possible side effects. If you have any concerns about your medication or if you have other side effects that you think are caused by this medication, please consult your doctor or pharmacist.
If you take more than the recommended dose, please seek medical advice immediately. The information provided on this page does not replace information from your healthcare professional. Please consult your healthcare professional for more information.
This article is jointly developed by members of the National Medication Information workgroup. The workgroup consists of cluster partners (National Healthcare Group, National University Health System and SingHealth), community pharmacies (Guardian, Unity and Watsons) and Pharmaceutical Society of Singapore. The content does not reflect drug availability and supply information in pharmacies and healthcare institutions. You are advised to check with the respective institutions for such information.
Last updated on Mar 2023
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