Naltrexone is a medication used to treat alcohol and narcotic drug addiction, according to Drugs.com. It works by blocking the effects of opioids (heroin, morphine, codeine). Avoid naltrexone if you have a history of alcohol or drug abuse and suffer from kidney, liver or bleeding disorders. Take naltrexone as your doctor prescribes. Failure to do so can lead to serious side effects.
Liver Damage
According to MedlinePlus, large doses of naltrexone can lead to liver damage. Symptoms of liver damage include excessive fatigue, poor appetite, pain in the upper right region of the stomach and abnormal bleeding or bruising. Dark urine, light-colored stool and yellowing of skin or eyes are additional signs of liver damage. See your doctor regularly so she can monitor liver functions while you are taking this medication.
Major Side Effects
Drugs.com states that naltrexone's serious side effects include tachycardia (fast heartbeat), visual problems, ear pain, tinnitis (ringing in your ears) and difficulty breathing. You can also experience confusion, mood changes, hallucinations and suicidal thoughts or behaviors.
Minor Side Effects
Mild side effects include nausea, vomiting, tearfulness, trouble sleeping, rash and joint or muscle pain, according to Medline Plus. Users might also experience increased thirst, fainting spells, lightheadedness, impotence, decreased sex drive and the inability to reach orgasm (anorgasmia).
Effects of an Overdose
Taking more naltrexone than your doctor prescribes can cause convulsions, dizziness, stomach pains or nausea, says Drugs.com. Seek emergency medical care if you suspect overdose.
Alertness Problems
Naltrexone can cause you to be less alert and slow your reaction times and thinking. Use caution when you drive or participate in activities that require your complete attention, warns Drugs.com.
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