Trazodone’s noticeable effects typically wear off within 6 to 8 hours, though the drug isn’t fully cleared from your body for much longer. The elimination half-life (the time it takes for half the drug to leave your system) ranges from 6 to 12 hours, meaning it takes roughly 1 to 3 days for trazodone to be completely eliminated. How long you actually feel its effects, especially drowsiness, depends on your dose, what you ate, and whether you take other medications.
When Effects Peak and Fade
Trazodone reaches its highest concentration in your bloodstream about 1 hour after you take it on an empty stomach, or about 2 hours if you’ve eaten. That peak is when sedation hits hardest, which is why most people who take it for sleep feel drowsy within 30 to 60 minutes of swallowing the pill.
After the peak, blood levels drop in two phases. The first decline happens relatively quickly, with a half-life of about 4 hours during the 3 to 10 hour window after dosing. Then the remaining drug clears more slowly, with a terminal half-life of 6 to 12 hours. In practical terms, the strong sedative feeling fades within the first 6 to 8 hours for most people, but a lingering grogginess or “hangover” effect can stretch into the next morning, particularly at higher doses.
Your body eliminates about 70% to 75% of an oral dose through urine within 72 hours, along with the drug’s breakdown products. So while you stop feeling trazodone’s effects well before that point, traces remain in your system for up to three days.
Immediate-Release vs. Extended-Release
If you take the standard immediate-release tablet (the most common form prescribed for sleep), blood levels rise and fall sharply. The extended-release version, typically prescribed for depression at higher doses, smooths out those peaks and troughs so you don’t get the same intense wave of drowsiness. The actual half-life is the same for both formulations. The extended-release tablet simply releases the drug more gradually into your gut, spreading the effects over a longer window rather than concentrating them in the first few hours.
Why It Lasts Longer for Some People
Several factors can slow trazodone’s clearance and make it feel like the drug lingers longer than expected.
Dose: At a low sleep dose (25 to 50 mg), the sedation tends to fade faster simply because there’s less drug to process. At antidepressant doses (150 to 300 mg or more), there’s more trazodone circulating, and the later, slower phase of elimination becomes more noticeable. Higher doses are more likely to leave you groggy into the next day.
Food: Taking trazodone with food delays peak levels by about an hour. This can push the window of strongest sedation later into the night, which some people experience as feeling more drowsy in the morning.
Age and liver function: Trazodone is broken down almost entirely by the liver. Older adults and people with reduced liver function metabolize the drug more slowly, so the effects can last noticeably longer. Body weight and overall metabolism also play a role, though age and liver health tend to matter most.
Medications That Slow Trazodone Clearance
Trazodone is processed by a specific liver enzyme called CYP3A4. Certain medications block this enzyme, which can dramatically increase how long trazodone stays active in your body. In one study, the antiviral drug ritonavir more than doubled trazodone’s half-life, increased overall drug exposure by 2.4 times, and cut the body’s clearance rate by 52%. That’s a significant change from a drug interaction.
Common medications that inhibit this same enzyme include certain antifungals (ketoconazole, itraconazole) and some HIV medications. Grapefruit juice also inhibits CYP3A4. If you take any of these alongside trazodone, the sedation will likely be stronger and last longer than you’d expect from the dose alone.
Alcohol Makes It Last Longer and Hit Harder
Both trazodone and alcohol are central nervous system depressants. Combining them doesn’t just add the sedative effects together; it amplifies them. You’ll feel more drowsy, more disoriented, and the combined sedation can slow your breathing and heart rate beyond what either substance would do alone. Because alcohol also competes for liver processing, drinking while trazodone is still active can effectively delay how quickly your body clears the drug.
Practical Timeline at a Glance
- 30 to 60 minutes: Drowsiness begins (faster on an empty stomach).
- 1 to 2 hours: Peak blood levels and strongest sedation.
- 6 to 8 hours: Most of the noticeable drowsiness has faded for a typical low dose.
- 12 to 24 hours: Residual grogginess possible, especially at higher doses or with slower metabolism.
- Up to 72 hours: Drug and its byproducts fully cleared from the body.
If you’re consistently feeling groggy well into the next day, the dose may be higher than you need, or another medication could be slowing trazodone’s breakdown. Adjusting the timing of your dose, even by an hour earlier in the evening, can also shift when the strongest sedation hits relative to your wake-up time.