The highest approved dose of trazodone is 600 mg per day, reserved for hospitalized patients with severe depression. For outpatients, the maximum is 400 mg per day. Most people taking trazodone never come close to either number, especially if they’re using it for sleep rather than depression.
Maximum Doses by Use
Trazodone’s upper limits depend on why you’re taking it and where you’re being treated. The FDA-approved prescribing label sets two ceilings for depression: 400 mg per day for outpatients and 600 mg per day for inpatients under closer medical supervision. Both are taken in divided doses throughout the day, not all at once.
The vast majority of trazodone prescriptions, however, are written off-label for insomnia. In that context, the doses are far lower. Most people find relief at 50 to 100 mg taken at bedtime, with a typical starting dose of 25 to 50 mg. The upper end for sleep use tops out around 200 mg at bedtime. If you’re taking trazodone only for sleep and your dose is creeping above 100 mg, that’s worth a conversation with whoever prescribed it.
Extended-Release vs. Immediate-Release Limits
Trazodone comes in two formulations, and they have different ceilings. The immediate-release tablets (the most commonly prescribed form) allow up to 400 mg for outpatients and 600 mg for inpatients. The extended-release version, sold under the brand name Oleptro, has a lower maximum of 375 mg per day. That’s because the extended-release form delivers the drug more steadily over time, so the peak concentration in your blood is different even at the same total dose.
How Doses Are Increased
Trazodone is never started at a high dose and jumped up quickly. For depression, the typical starting point is 150 mg per day split into multiple doses. From there, the dose can be raised by 50 mg every three to four days based on how you respond and what side effects show up. For the extended-release version, increases happen in 75 mg steps on a similar timeline. This gradual approach matters because trazodone’s most common side effects, like dizziness, drowsiness, and drops in blood pressure when you stand up, tend to be worst in the early days and with each dose increase.
Reaching the maximum dose of 400 or 600 mg typically takes several weeks. Not everyone needs to get there. Many people with depression respond well in the 200 to 300 mg range, and pushing higher only makes sense if lower doses haven’t worked.
Why the Effective Maximum Can Be Lower
Your body breaks down trazodone using a specific liver enzyme called CYP3A4. If you take other medications that slow down this enzyme, trazodone builds up to higher levels in your bloodstream than the dose alone would suggest. Certain antifungal medications, some antibiotics, and even grapefruit juice can have this effect. In those situations, a 300 mg dose might hit your body like a much higher one, effectively lowering the safe ceiling.
Other health factors also shift the practical maximum. Trazodone can cause a modest increase in the QT interval, a measurement of your heart’s electrical rhythm. This effect is relatively small (on the order of 4 to 8 milliseconds), but it becomes more concerning if you already have risk factors: heart failure, abnormally slow heart rate, low potassium or magnesium levels, a genetic predisposition to irregular heart rhythms, or use of other medications that also affect heart rhythm. Notably, FDA review data found that most reported cases of serious cardiac rhythm problems with trazodone occurred at doses of 100 mg or less, suggesting that the risk isn’t purely dose-dependent. People with underlying heart vulnerabilities can run into trouble even at low doses.
What Happens at Very High Doses
In overdose situations (typically above 600 mg, and especially above 1,000 mg), trazodone can cause extreme drowsiness, dangerously low blood pressure, seizures, and heart rhythm disturbances. Trazodone overdoses are generally less lethal than overdoses of older antidepressants, but they are still medical emergencies, particularly when combined with alcohol or other sedating drugs. The 600 mg ceiling for inpatients exists specifically because those patients are monitored in ways that aren’t possible at home.
If you’re currently taking trazodone and feel it isn’t working at your current dose, the path forward is a gradual increase supervised by your prescriber, not doubling up on your own. The difference between a therapeutic dose and a problematic one is smaller than many people assume.