Trazodone is an antidepressant that has been available in the United States since 1981, FDA-approved for treating major depressive disorder in adults. But in practice, it’s prescribed far more often for a different reason: insomnia. Its strong sedating effect at lower doses has made it one of the most commonly prescribed sleep aids in the country, even though that use is technically off-label.
Depression: The FDA-Approved Use
Trazodone was originally developed and approved to treat major depressive disorder. It works differently from the better-known SSRIs like sertraline or fluoxetine. Rather than simply blocking the reabsorption of serotonin, trazodone has a more complex action: it reduces excess serotonin activity at certain receptor sites while increasing serotonin levels at others. This dual mechanism can improve mood, reduce anxiety, and help restore normal sleep patterns, which are often disrupted by depression.
When used for depression, trazodone is typically prescribed at higher doses than when it’s used for sleep. Antidepressant doses generally start around 150 mg per day and can go up to 400 mg or more, divided throughout the day. At these higher doses, the mood-lifting effects become more prominent alongside the sedation. Many people find that the drowsiness becomes less noticeable over time as the body adjusts, though it doesn’t disappear entirely for everyone.
Insomnia: The Most Common Use
Despite not carrying an FDA indication for insomnia, trazodone is one of the most frequently prescribed medications for sleep problems in the U.S. Doctors favor it partly because it carries a lower risk of dependence compared to traditional sleep medications like benzodiazepines or the “Z-drugs” (zolpidem, eszopiclone). You can stop taking trazodone without the rebound insomnia that often comes with those alternatives.
For sleep, doses are much lower than those used for depression, typically in the range of 25 to 100 mg taken at bedtime. At these doses, the sedating properties dominate while the antidepressant effects are minimal. The drowsiness kicks in within 30 to 60 minutes for most people, making it useful for those who struggle to fall asleep. It can also help people who wake frequently during the night, though it’s less effective for that pattern than for initial sleep onset.
Trazodone is especially popular as a sleep aid for people already taking another antidepressant. SSRIs, for example, can cause insomnia as a side effect. Adding a low dose of trazodone at bedtime can address the sleep disruption without switching antidepressants or adding a habit-forming sleep drug.
Other Off-Label Uses
Beyond depression and insomnia, trazodone is sometimes prescribed for anxiety disorders, particularly generalized anxiety. Its calming, sedating quality can take the edge off persistent worry, and it lacks the addiction potential of benzodiazepines like lorazepam or alprazolam. Some clinicians also use it for agitation in older adults with dementia, though evidence for this use is mixed.
Common Side Effects
The side effects of trazodone are closely tied to the properties that make it useful. Drowsiness is the most prominent one, which is a benefit if you’re taking it for sleep but a problem if you’re taking higher doses for depression during the day. Many people also experience dizziness or lightheadedness, particularly when standing up quickly from a sitting or lying position. This happens because trazodone can temporarily lower blood pressure when you change positions.
Dry mouth is another frequent complaint. Headache and nausea can occur, especially in the first week or two, but these tend to fade as your body adjusts. One advantage trazodone has over many other antidepressants is its relatively neutral effect on weight. While SSRIs are known for causing gradual weight gain in some people, trazodone is less likely to shift the scale significantly in either direction. It also causes fewer sexual side effects than SSRIs, which is a meaningful consideration for many people weighing their options.
Priapism: A Rare but Serious Risk
One side effect that gets special attention with trazodone is priapism, a prolonged, painful erection lasting more than four hours that is unrelated to sexual arousal. This is a medical emergency that requires immediate treatment to prevent permanent damage. The incidence is low, estimated between 1 in 1,000 and 1 in 10,000 users, but trazodone is involved in nearly 80% of all cases of medication-induced priapism. Men starting trazodone should be aware of this risk and seek emergency care if it occurs.
How Trazodone Compares to Other Options
If your doctor has brought up trazodone, it helps to understand where it fits among the alternatives. For depression, it’s generally not the first choice. SSRIs and SNRIs are preferred as initial treatments because they tend to cause less daytime sedation. Trazodone for depression is more common as an add-on or a switch after other medications haven’t worked well, or when insomnia is a major part of the depression picture.
For insomnia, trazodone occupies a middle ground. It’s less potent as a sleep aid than dedicated sleep medications, but it’s considered safer for long-term use. It doesn’t carry the “black box” warnings about complex sleep behaviors (like sleepwalking or sleep-driving) that some newer sleep drugs do, and it doesn’t produce the tolerance that makes benzodiazepines less effective over time. For people who need a sleep aid they can take for months or longer, trazodone is often a practical choice.
What to Expect When Starting
If you’re taking trazodone for sleep, the effects are usually noticeable from the first dose. You’ll likely feel drowsy within an hour and sleep more easily that night. If you’re taking it for depression, the timeline is longer. Mood improvements typically take two to four weeks to become apparent, similar to other antidepressants. During the first week, the sedation and any initial side effects like nausea are usually at their peak.
Trazodone should be taken with food or a light snack, as this improves absorption and reduces the chance of dizziness. If you’re taking it only at bedtime, plan to allow a full night’s sleep (seven to eight hours) so the drowsiness wears off before you need to be alert. Morning grogginess is one of the more common complaints, particularly at higher doses, and adjusting the timing or dose can help.
Stopping trazodone should be done gradually rather than abruptly, especially at higher doses. While it doesn’t cause the kind of physical dependence seen with benzodiazepines, discontinuing suddenly can lead to withdrawal-like symptoms including irritability, anxiety, and disrupted sleep. A slow taper over one to two weeks is standard practice.