Trazodone is generally safe when taken as prescribed, with a side effect profile that most people tolerate well. It has been on the market since the early 1980s, is FDA-approved for treating depression, and is one of the most commonly prescribed medications for sleep in the United States, even though that use is technically off-label. That said, “safe” depends on your specific health picture, particularly your age, heart health, and what other medications you take.
Most Common Side Effects
The side effects most people experience are predictable and dose-related. In clinical trials, drowsiness was the most frequent, affecting about 24% of hospitalized patients and 41% of outpatients. That drowsiness is actually why so many doctors prescribe trazodone for insomnia at lower doses than those used for depression.
Other common side effects reported in trials include:
- Dizziness or lightheadedness: 20% to 28% of patients
- Dry mouth: 15% to 34%
- Headache: 10% to 20%
- Nausea or vomiting: 10% to 13%
- Fatigue: 6% to 11%
- Constipation: 7% to 8%
- Blurred vision: 6% to 15%
Most of these side effects are strongest during the first few weeks and tend to ease as your body adjusts. Taking trazodone with food slows absorption and can reduce nausea and dizziness.
Doses for Sleep vs. Depression
The dose you take matters a lot for your side effect experience. When prescribed for depression, adults typically start at 150 mg per day, and doctors can increase the dose up to 400 mg daily. When prescribed off-label for sleep, doses are much lower, usually between 25 mg and 100 mg at bedtime. At these lower doses, side effects are less frequent and less intense. The most common complaint at sleep doses is next-morning grogginess, which often resolves by lowering the dose slightly.
Serious but Rare Risks
A few uncommon risks deserve attention because they require immediate action if they occur.
Priapism
Trazodone can cause priapism, a prolonged, painful erection unrelated to sexual arousal. This affects fewer than 1 in 1,000 patients, with most cases occurring within the first month of starting the medication. It is a medical emergency. If an erection lasts more than four hours, you need emergency care to prevent permanent damage.
Serotonin Syndrome
Combining trazodone with other medications that raise serotonin levels (including certain antidepressants, migraine medications called triptans, and the supplement St. John’s wort) can trigger serotonin syndrome. Symptoms include agitation, rapid heartbeat, high body temperature, muscle twitching, and loss of coordination. This is rare with trazodone alone but becomes a real concern when multiple serotonin-boosting substances overlap.
Heart Rhythm Changes
Trazodone has been associated with prolongation of the QT interval, a measure of electrical activity in the heart that, when extended, can increase the risk of dangerous irregular heartbeats. This risk is highest in people who already have heart conditions, take other QT-prolonging medications, or have abnormal electrolyte levels. If you have a history of heart problems, your doctor should evaluate this before prescribing trazodone.
Blood Pressure Drops and Fall Risk
Trazodone can lower blood pressure, especially when you stand up quickly. In clinical trials, about 4% to 7% of patients experienced low blood pressure, and 3% to 5% had episodes of fainting. This effect is more pronounced at higher doses and during the first few days of treatment. Getting up slowly from a seated or lying position reduces this risk considerably.
For older adults, this blood pressure drop raises concerns about falls. However, a large nationwide study comparing trazodone to antipsychotic medications in adults 65 and older found no significant difference in fall rates between the two groups. Trazodone is not considered one of the highest-risk medications for elderly patients, but the blood pressure effect still warrants caution, particularly for anyone already prone to dizziness or unsteadiness.
Safety During Pregnancy and Breastfeeding
Trazodone does not have a straightforward “safe” or “unsafe” label during pregnancy. The decision involves weighing the risks of the medication against the risks of untreated depression, which can itself harm both the pregnant person and the developing baby. If you become pregnant while taking trazodone, your doctor can help you evaluate whether continuing, switching, or stopping makes the most sense for your situation. Stopping abruptly without medical guidance can cause withdrawal symptoms and a relapse of depression.
During breastfeeding, trazodone passes into breast milk in very small amounts and has not been linked with side effects in breastfed infants, according to NHS guidance.
Overdose Safety Profile
Compared to older antidepressants, trazodone has a relatively wide margin of safety in overdose. Death from a trazodone-only overdose is rare. Symptoms of overdose include extreme drowsiness, seizures, irregular heartbeat, and low blood pressure. Long-term heart or breathing problems after an overdose are also uncommon. The risk increases substantially when trazodone is combined with alcohol, benzodiazepines, or other sedating substances, which can suppress breathing to dangerous levels.
Drug Interactions to Watch
Trazodone is broken down in the liver by specific enzymes, so medications that slow those enzymes down can increase trazodone levels in your blood and intensify side effects. Common examples include certain antifungal medications and some HIV treatments. Going the other direction, medications like certain seizure drugs can speed up trazodone’s breakdown, making it less effective.
Alcohol amplifies trazodone’s sedating effects and blood pressure drops, making the combination riskier than either substance alone. If you take trazodone for sleep, even a moderate amount of alcohol in the evening can lead to excessive sedation, severe dizziness, or fainting.
What Long-Term Use Looks Like
Trazodone does not carry the same dependency concerns as sleep medications like benzodiazepines or Z-drugs. It is not a controlled substance, and physical dependence is uncommon. That said, stopping trazodone abruptly after taking it for weeks or months can produce discontinuation symptoms like irritability, anxiety, and difficulty sleeping. Tapering the dose gradually over a period of days to weeks, guided by your prescriber, avoids this.
Many people take trazodone for months or years, particularly for sleep. There is no well-established ceiling on how long it can be used safely, and it does not lose its sleep-promoting effect the way some other medications do over time.