Naltrexone is a medication commonly used to treat alcohol and opioid dependence. Like any medication, it can have side effects. However, it's important to note that not everyone experiences side effects, and if they do occur, they are usually mild and temporary. Some common side effects of naltrexone may include:

1. Nausea or upset stomach
2. Headache
3. Dizziness or lightheadedness
4. Fatigue or tiredness
5. Sleep disturbances, such as insomnia or vivid dreams
6. Anxiety or nervousness
7. Muscle or joint pain
8. Decreased appetite

It's important to remember that these side effects are generally temporary and tend to improve over time as your body adjusts to the medication. If you experience any side effects that are severe, persistent, or concerning, it's important to contact your healthcare provider for further evaluation and guidance.

Additionally, it's worth noting that naltrexone can have rare but serious side effects, such as liver problems. Your healthcare provider will monitor you closely while you are taking this medication to ensure your safety.

It's always a good idea to discuss any concerns or questions about medication side effects with your healthcare provider. They can provide you with personalized information and guidance based on your specific situation.

To elaborate further, the above are the most common side effects, but there are some that are rarer and some that are quite serious:

Common Side Effects:

• Nausea: This is one of the most commonly reported side effects, especially when starting the medication.
• Headache
• Dizziness
• Fatigue or tiredness
• Insomnia or difficulty sleeping
• Anxiety or nervousness
• Abdominal pain or cramping

Less Common or Rare Side Effects:

• Increased or decreased energy
• Joint or muscle pain
• Rash
• Decreased appetite
• Diarrhea or constipation
• Increased thirst
• Irritability

Serious Side Effects: While rare, naltrexone can also cause more serious side effects. These include:

• Liver damage: Symptoms might include yellowing of the skin or eyes (jaundice), dark urine, stomach pain, or swelling.
• Allergic reactions: Symptoms can include difficulty breathing, swelling of the face, lips, tongue, or throat, hives, or rash.
• Depression or suicidal thoughts: It's essential to seek medical attention if someone taking naltrexone experiences significant changes in mood or thoughts of self-harm.
• Pneumonia: Some people have developed pneumonia while taking naltrexone.