Maximum Trazodone Dose
For major depressive disorder, the maximum dose of trazodone is 400 mg/day for outpatients and 600 mg/day for inpatients (more severely depressed patients), according to FDA labeling 1.
Dosing by Indication
Major Depressive Disorder
Starting and Titration:
- Initial dose: 150 mg/day in divided doses 1
- Increase by 50 mg/day every 3-4 days based on clinical response and tolerability 1
- Outpatient maximum: 400 mg/day in divided doses 1
- Inpatient maximum: 600 mg/day in divided doses (for more severely depressed patients) 1
Optimal dosing strategy: Studies demonstrate that 150-300 mg/day is typically the effective antidepressant dose range 2, 3. The mean maximum daily dose in clinical trials was approximately 273-310 mg 2, 3. A single nighttime dose weighted at bedtime (rather than divided doses) shows equal antidepressant efficacy with better tolerability—less daytime drowsiness and improved sleep 4, 5.
Insomnia (Off-Label)
The American Academy of Sleep Medicine guidelines suggest NOT using trazodone for insomnia treatment 6. This recommendation is based on trials using 50 mg doses that showed no significant differences in sleep efficiency or discontinuation rates compared to placebo, despite some improvement in subjective sleep quality 7. The 2020 VA/DoD guidelines similarly advise against trazodone use for chronic insomnia disorder due to low-quality efficacy evidence that was outweighed by its adverse effect profile 7.
However, when used off-label for insomnia (particularly in patients with comorbid depression), typical doses range from 25-75 mg for sedative/anxiolytic effects 8. The 2002 Alzheimer's disease management guidelines cite a maximum of 200-400 mg/day in divided doses when used for agitation and sleep disturbances 9.
Important Clinical Considerations
Administration: Take shortly after a meal or light snack to optimize absorption 1. Tablets can be swallowed whole or broken along the score line 1.
Dose adjustments needed:
- With strong CYP3A4 inhibitors: Consider reducing dose based on tolerability 1
- With strong CYP3A4 inducers: Consider increasing dose based on therapeutic response 1
- Elderly or debilitated patients: Maximum tolerated doses are typically 300-400 mg/day (compared to up to 600 mg/day in younger patients) 10
Discontinuation: Gradually reduce dosage rather than stopping abruptly to minimize withdrawal symptoms 1.
Critical Safety Warnings
The evidence consistently shows trazodone is not FDA-approved for insomnia 8, and its efficacy for this indication is not well established 8. When prescribed for depression, low-dose trazodone does not constitute adequate treatment of major depression in patients with comorbid insomnia 8.
Common adverse effects include dizziness, dry mouth, somnolence, sedation, and nausea 2, 3. More serious concerns include orthostatic hypotension, cardiac arrhythmias, and priapism, which require close monitoring 10. Use with caution in patients with premature ventricular contractions 9.