Yes, it is generally safe to take naltrexone, hydroxyzine, and bupropion (Wellbutrin) together, with important monitoring requirements.
The combination of naltrexone and bupropion is FDA-approved as a fixed-dose formulation (naltrexone-bupropion ER) for chronic weight management, demonstrating established safety when used together 1. Adding hydroxyzine, an antihistamine with sedative properties, does not create any documented contraindications with this combination.
Key Safety Considerations
Established Safety of Naltrexone-Bupropion Combination
- The FDA approved naltrexone-bupropion ER in 2014 specifically as a combination therapy, with extensive safety data from multiple 56-week phase III trials 1
- Studies showed no significant differences in psychiatric adverse events between naltrexone-bupropion and placebo, including depression (0.1-1.3% vs 0.2-1.6%) and anxiety (0.6-5.4% vs 0.2-4.3%) 1
- In patients with mild to moderate depressive symptoms, naltrexone-bupropion showed no increased risk of psychiatric adverse events (27.5% vs 22.1% placebo), depressive symptom worsening (9.5% vs 8.8%), or suicidal ideation (1.8% vs 2.0%) 2
Adding Hydroxyzine to the Regimen
Hydroxyzine can be safely added with these considerations:
Sedation and CNS effects:
- Hydroxyzine may enhance the CNS depressant effects when combined with bupropion, which can cause cognitive impairment 3
- Advise patients to monitor for excessive drowsiness, especially when initiating therapy
- Avoid alcohol, which can compound sedation and increase seizure risk with bupropion 3
No documented drug-drug interactions:
- There are no specific contraindications or major interactions documented between hydroxyzine and either naltrexone or bupropion
- Hydroxyzine is metabolized differently (CYP450 system) than the naltrexone-bupropion combination
Critical Monitoring Requirements
Blood Pressure and Heart Rate
Monitor at baseline and regularly, especially in the first 12 weeks 1, 4:
- Naltrexone-bupropion can cause modest increases in blood pressure and heart rate 1, 4
- Check BP and pulse at each visit initially, then periodically
Seizure Risk Assessment
Bupropion lowers the seizure threshold 1, 3:
- Contraindicated in patients with seizure disorders
- Use caution with factors that increase seizure risk: head trauma, CNS tumors, eating disorders, abrupt alcohol/benzodiazepine discontinuation
- The dose-related seizure risk makes adherence to dosing schedules critical 3
Psychiatric Monitoring
Monitor for emergence of:
- Anxiety, agitation, panic attacks
- Mood changes, depression worsening
- Suicidal ideation (though risk is not elevated with this combination) 3, 2
Absolute Contraindications to This Combination
Do not use if the patient:
- Requires opioid medications (naltrexone blocks opioid effects and can precipitate withdrawal) 1, 5
- Has uncontrolled hypertension 4
- Has a seizure disorder 1, 4
- Is taking MAO inhibitors or stopped them within 14 days 4, 3
- Is taking other bupropion-containing products 3
- Has anorexia nervosa or bulimia 4
Practical Implementation
Dosing considerations:
- If using separate naltrexone and bupropion (rather than the fixed-dose combination), ensure proper titration
- Standard naltrexone-bupropion ER dosing: titrate weekly to 2 tablets twice daily (32mg naltrexone/360mg bupropion total daily) 4
- Hydroxyzine can be dosed as needed or scheduled, typically 25-100mg daily in divided doses
Common side effects to counsel on:
- Nausea (most common, 4-32% incidence) 4
- Headache, constipation, dizziness, dry mouth 4
- These typically improve with continued use
Special Populations
Renal impairment:
- Reduce naltrexone-bupropion to 1 tablet twice daily with moderate to severe renal impairment 4
Hepatic impairment:
Older adults (>65 years):
- Use caution due to increased CNS sensitivity 4
This combination is well-established and safe when appropriate monitoring is in place and contraindications are excluded. The addition of hydroxyzine requires standard precautions for CNS effects but poses no specific interaction concerns.