Trazodone 50 mg is a prescription tablet most commonly used as a sleep aid, though the drug is officially FDA-approved to treat major depressive disorder in adults. The 50 mg dose sits squarely in the range used for insomnia (25 to 100 mg), which is far lower than the doses needed for depression (150 to 600 mg). If you’ve been prescribed a 50 mg tablet, your provider is almost certainly using it to help you fall asleep and stay asleep.
Why 50 mg Is the Most Common Dose
Trazodone works differently at different doses because it affects multiple receptor systems in the brain. At low doses like 50 mg, it primarily blocks two types of receptors: one that promotes wakefulness and one tied to the body’s alertness response. The combined effect is sedation without the heavy next-day grogginess that stronger sleep medications often cause. Trazodone has a relatively short half-life of 3 to 6 hours, which means it helps you get to sleep and stays active long enough to maintain sleep through most of the night, then clears your system before morning.
At higher doses (150 to 400 mg per day, sometimes up to 600 mg for hospitalized patients), trazodone begins to act more like a traditional antidepressant by increasing serotonin activity in the brain. But these higher doses also bring more side effects, particularly dizziness when standing up and excessive sedation, which limits how well people tolerate them. The 50 mg dose is popular precisely because it offers the sleep benefit with fewer of those problems.
A systematic review of 45 studies on trazodone for insomnia found that over 95% concluded it was effective. Despite this, trazodone is not FDA-approved specifically for insomnia. It is one of the most widely prescribed off-label sleep medications in the United States.
What It Feels Like to Take It
Most people take trazodone 50 mg about 30 minutes before bed. Drowsiness comes on relatively quickly. The most common side effects at this dose are mild: tiredness, weakness, stuffy nose, changes in appetite, and occasional diarrhea. Some people notice swelling in their hands, feet, or legs.
Sexual side effects are possible, including reduced sex drive in both men and women, difficulty reaching orgasm, and erectile problems. These are worth knowing about because they sometimes go unrecognized as medication-related.
One effect to be prepared for: dizziness or lightheadedness when you stand up quickly, especially in the middle of the night. Trazodone lowers blood pressure slightly, and the shift from lying down to standing can cause a brief head rush or unsteadiness. This is particularly relevant for older adults, who face a higher risk of falls. Getting up slowly, sitting on the edge of the bed for a moment before standing, makes a real difference.
Serious Side Effects to Watch For
Rare but serious reactions include fast or irregular heartbeat, chest pain, fainting, and seizures. A condition called serotonin syndrome can occur if trazodone is combined with other medications that raise serotonin levels. Signs include fever, sweating, confusion, rapid heartbeat, severe muscle stiffness, and loss of coordination.
Men should be aware of a rare but urgent side effect: prolonged erections. One study at a Veterans Affairs hospital found that about 8% of men starting trazodone developed prolonged erections, though none progressed to full priapism (an erection lasting more than four hours that requires emergency treatment). An erection lasting more than six hours is a medical emergency because it can cause permanent damage. This risk is low at the 50 mg dose, but it is worth knowing about before you start.
Drug Interactions
Trazodone is broken down in the liver by a specific enzyme. Certain medications block that enzyme, which causes trazodone to build up in your bloodstream to potentially dangerous levels. In a study of 10 healthy volunteers, taking trazodone with ritonavir (an antiviral) more than doubled the amount of trazodone in the blood and led to nausea, low blood pressure, and fainting.
Antifungal medications like ketoconazole and itraconazole can cause the same problem. So can some HIV medications. If you take any of these, your prescriber will typically lower your trazodone dose or choose a different sleep medication altogether. The main concern with elevated trazodone levels, beyond the unpleasant side effects, is an increased risk of abnormal heart rhythms.
Stopping Trazodone 50 mg
Even at a low dose, stopping trazodone abruptly can cause withdrawal symptoms. People who have quit 50 mg cold turkey report dizziness, nausea, anxiety, weakness, difficulty walking, elevated blood pressure, and vivid nightmares. These symptoms vary widely from person to person. Some feel nothing; others find the experience genuinely disruptive.
A gradual taper avoids most of this. One common approach is to reduce the dose by about 12.5 mg (a quarter of a 50 mg tablet) every two weeks. People who taper this slowly typically report few or no withdrawal effects. If you want to stop taking trazodone, plan the taper with your prescriber rather than stopping on your own.
How It Compares to Other Sleep Medications
Trazodone occupies an unusual niche. Unlike dedicated sleep drugs such as zolpidem, it was designed as an antidepressant and simply happens to be very sedating at low doses. This gives it a few practical advantages: it is not classified as a controlled substance, it does not appear to cause tolerance at sleep-promoting doses (meaning it keeps working without needing to increase the amount), and it carries a lower risk of dependence than benzodiazepines.
The trade-off is that the evidence base for trazodone as a sleep aid, while largely positive, is not as robust as for medications specifically developed and approved for insomnia. It also comes with its own side effect profile, including the blood pressure drops and sexual effects that some other sleep medications do not share. For many people, though, 50 mg of trazodone strikes a practical balance: effective, non-addictive, inexpensive, and generally well-tolerated.