Generic Name: Naltrexone Injection (nal TREX one)
Brand Name: Vivitrol
Medically reviewed on July 4, 2018
Uses of Naltrexone Injection:
- It is used to help keep you alcohol-free.
- It is used to keep a drug-free state.
- It may be given to you for other reasons. Talk with the doctor.
What do I need to tell my doctor BEFORE I take Naltrexone Injection?
- If you have an allergy to naltrexone or any other part of naltrexone injection.
- If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
- If you are taking an opioid drug like morphine or oxycodone, are addicted to an opioid drug, or are having withdrawal signs.
- If you have taken a pain drug within the past 7 to 10 days.
- If you are breast-feeding or plan to breast-feed.
This is not a list of all drugs or health problems that interact with naltrexone injection.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take naltrexone injection with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Naltrexone Injection?
- Tell all of your health care providers that you take naltrexone injection. This includes your doctors, nurses, pharmacists, and dentists.
- Avoid driving and doing other tasks or actions that call for you to be alert until you see how naltrexone injection affects you.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- This medicine may affect certain lab tests. Tell all of your health care providers and lab workers that you take naltrexone injection.
- Avoid drinking alcohol while taking naltrexone injection.
- Do not take pain drugs while you are taking naltrexone injection. Pain drugs will not work. Do not take more pain drugs to try to get them to work. Doing this may cause very bad injury, coma, or death. Talk with your doctor.
- People taking naltrexone injection to keep a drug-free state may get more effects from pain drugs when naltrexone injection is stopped. Even low doses of pain drugs may cause very bad and sometimes deadly effects in these people. Talk with your doctor.
- If you are addicted to pain drugs and are given naltrexone injection, you may have signs of withdrawal. Talk with your doctor.
- A type of lung infection caused by an allergic reaction has happened with naltrexone injection. If this happens, you may need to be treated in a hospital. Talk with your doctor.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using naltrexone injection while you are pregnant.
How is this medicine (Naltrexone Injection) best taken?
Use naltrexone injection as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- It is given as a shot into a muscle.
What do I do if I miss a dose?
- Call your doctor to find out what to do.
See also: Dosage Information (in more detail)
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
- Signs of low mood (depression), thoughts of killing yourself, nervousness, emotional ups and downs, thinking that is not normal, anxiety, or lack of interest in life.
- Very bad dizziness or passing out.
- Very bad headache.
- Feeling confused.
- Trouble breathing, slow breathing, or shallow breathing.
- Feeling very sleepy.
- Sex problems in men.
- Signs of lung or breathing problems like shortness of breath or other trouble breathing, cough, or fever.
- Area that feels hard, blisters, dark scab, lumps, open wound, pain, swelling, or other very bad skin irritation where the shot was given.
What are some other side effects of Naltrexone Injection?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Feeling nervous and excitable.
- Belly pain.
- Hard stools (constipation).
- Loose stools (diarrhea).
- More thirst.
- Not able to sleep.
- Upset stomach or throwing up.
- Feeling sleepy.
- Muscle or joint pain.
- Not hungry.
- Feeling tired or weak.
- Irritation where the shot is given.
- Nose or throat irritation.
- Dry mouth.
- Back pain.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
See also: Side effects (in more detail)
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Naltrexone Injection?
- If you need to store naltrexone injection at home, talk with your doctor, nurse, or pharmacist about how to store it.
Consumer information use
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
- Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
- This medicine comes with an extra patient fact sheet called a Medication Guide. Read it with care. Read it again each time naltrexone injection is refilled. If you have any questions about naltrexone injection, please talk with the doctor, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
More about naltrexone
- Naltrexone Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Patient Tips
- Drug Images
- Drug Interactions
- Compare Alternatives
- Support Group
- Pricing & Coupons
- 306 Reviews
- Drug class: antidotes
- Naltrexone injection
- Naltrexone Tablets
- Naltrexone (Advanced Reading)
- Naltrexone Intramuscular (Advanced Reading)