The typical maximum dose of trazodone for sleep is 100 mg per day. This is well below the antidepressant dosing range, which can go up to 400 mg daily for outpatients. When prescribed for insomnia, trazodone works through a different set of receptors than it does at higher antidepressant doses, which is why the effective sleep dose stays low.
Why the Sleep Dose Stays at 100 mg
Trazodone promotes sleep by blocking specific serotonin, histamine, and adrenaline-related receptors in the brain. These receptors respond at low doses, in the 25 to 100 mg range. A six-week trial of 75 subjects tested doses of 50, 75, and 100 mg per day and found that all three improved sleep, but 100 mg produced the best results. Going higher doesn’t necessarily improve sleep further because the receptors responsible for sedation are already fully engaged at that level.
At doses above 150 mg, trazodone starts acting more like a traditional antidepressant, affecting serotonin reuptake. That’s a different pharmacological effect entirely, and it comes with a different side effect profile. Prescribers rarely push beyond 100 mg for sleep alone because the benefit plateaus while the risk of side effects climbs.
How Most Prescribers Start
The standard approach is to begin at 25 or 50 mg taken at bedtime and increase gradually if needed. Most people find their effective dose somewhere between 50 and 100 mg. You’ll typically be asked to take it 30 minutes to an hour before bed on an empty stomach, since the medication reaches peak blood levels about one hour after swallowing. Taking it with food delays that peak to around two hours, which can shift when you feel drowsy.
Common Side Effects
Even at sleep-level doses, trazodone can cause noticeable side effects. Pooled data from adult populations show the most frequent ones: dry mouth (about 18% of users), dizziness or sedation (up to 22%), nausea or vomiting (around 16%), constipation (14%), headache (10%), and blurred vision (8%). Low blood pressure affects roughly 10% of users. These side effects tend to be more pronounced at higher doses, which is another reason the sleep dose stays conservative.
Morning grogginess is the side effect that bothers most sleep users. Because the drug’s half-life is around six hours in younger adults, taking a dose too late or taking too high a dose can leave you foggy the next day.
A Rare but Serious Risk for Men
Priapism, a prolonged and painful erection unrelated to sexual arousal, occurs in fewer than 1% of men taking trazodone. Estimates put the rate at roughly 1 in 1,000 to 1 in 10,000 male users. Most cases happen within the first 28 days of starting the medication, and the majority involve doses of 150 mg per day or less. This is a medical emergency that requires immediate treatment to prevent permanent damage, so men starting trazodone should be aware of this possibility from the outset.
Lower Limits for Older Adults
If you’re over 65, the math changes. Older adults metabolize trazodone more slowly. The drug’s half-life nearly doubles in people over 69, jumping from about 6.4 hours to 11.6 hours. That means the medication lingers longer, increasing the risk of next-day sedation, dizziness, and falls.
While the maximum tolerated dose of trazodone for elderly patients treating depression can reach 300 to 400 mg per day, sleep dosing in this age group is more cautious and typically starts at 25 mg. It’s worth noting that major clinical reviews, including a National Institutes of Health consensus panel, have concluded that the safety and efficacy of trazodone as a sleep aid in older adults haven’t been adequately studied. It remains widely prescribed for this purpose, but the evidence base is thinner than many people assume.
Medications That Change the Equation
Certain medications slow down the liver enzymes that break down trazodone, effectively raising its blood levels even if you don’t change your dose. If you’re taking one of these drugs, what feels like a 50 mg dose to your body could behave more like 100 mg or higher. This is one reason your prescriber needs a full list of your current medications before setting a dose. The FDA labeling notes that dosing should start low and increase gradually, with close attention to drowsiness as a signal that levels may be too high.
Stopping After Long-Term Use
If you’ve been taking trazodone for sleep over a period of months or years, stopping abruptly can cause rebound insomnia and other uncomfortable withdrawal-like symptoms. A gradual taper is the standard approach. Clinicians experienced with medication tapering generally recommend reducing by no more than 10% per week, though the pace depends on how long you’ve been on the medication and how you tolerate each reduction. Even at sleep-level doses of 50 to 100 mg, a slow step-down is preferable to quitting cold turkey.