Prescription ·Moderate evidence ·Reviewed May 2026
Prescription serotonin antagonist and reuptake inhibitor (SARI) approved for major depressive disorder. Most commonly used off-label at low doses as a sleep aid due to its potent sedating and non-habit-forming properties. At higher antidepressant doses, provides serotonergic and anxiolytic activity. A widely used alternative to benzodiazepines and Z-drugs for insomnia. Dosage must be determined by your prescribing physician.
The bottom line
Evidence rating moderate. Most-documented uses: insomnia improvement (off-label), depression symptom relief, anxiety reduction. 11 sources indexed (2003–2025), with 7 interaction records on file.
Core mechanism
Inhibits serotonin reuptake (SERT blockade) while antagonizing serotonin 5-HT2A and 5-HT2C receptors. Also antagonizes histamine H1 receptors (contributing to sedation) and alpha-1 adrenergic receptors (contributing to orthostatic hypotension). The dual action of serotonin reuptake inhibition and 5-HT2A antagonism may enhance net serotonergic signaling through 5-HT1A receptors.
Take shortly after a meal or light snack to improve absorption and reduce dizziness. Take at bedtime due to sedating effects.9
Nutrients this medication can lower over time, and what to replace.
Antidepressant-associated SIADH can increase renal free-water retention and dilute serum sodium, producing hyponatremia.
Trazodone is a serotonin antagonist and reuptake inhibitor (SARI). Combined with 5-HTP, the increased serotonin production creates serotonin syndrome risk.
Recommendation: Do NOT take 5-HTP with trazodone. If additional sleep support is needed, discuss non-serotonergic options with your prescriber.
St. John's Wort has SSRI-like activity and induces CYP3A4, which is the primary enzyme that metabolizes trazodone. The combination both adds serotonergic load (risking serotonin syndrome) and accelerates trazodone clearance, potentially undercutting its sleep and mood benefit.
Recommendation: Avoid St. John's Wort with trazodone. If you have been taking it, allow a 2-week washout before starting trazodone and avoid restarting it during treatment.
L-Tryptophan is the upstream serotonin precursor. Trazodone is a serotonin reuptake inhibitor and 5-HT2A antagonist with active metabolite mCPP that is itself a serotonin receptor agonist. Combined with supplemental tryptophan, synaptic serotonin can rise to toxic levels, with risk of serotonin syndrome (tremor, agitation, hyperthermia, clonus).
Recommendation: Do not take L-tryptophan supplements with trazodone. Food sources of tryptophan are fine.
SAMe has independent serotonergic and antidepressant activity. Combined with trazodone (a serotonin reuptake inhibitor whose active metabolite mCPP also agonizes serotonin receptors), the additive serotonergic load raises the risk of serotonin syndrome.
Recommendation: Avoid starting SAMe alongside trazodone without explicit prescriber approval. If used together, start SAMe at the lowest effective dose and watch for tremor, sweating, restlessness, or fast heart rate.
Valerian root acts on GABA-A receptors via valerenic acid, producing sedation. Trazodone is itself a strongly sedating antidepressant commonly used for sleep. Combined CNS depression can produce excessive next-day grogginess, impaired driving, falls, and confusion, particularly in older adults.
Recommendation: Avoid valerian root with trazodone, especially if you take trazodone for sleep. If both are unavoidable, do not drive or operate machinery, and watch for daytime drowsiness and unsteady gait.
Ashwagandha contains compounds with GABA-A agonist activity that produce mild sedation. Trazodone is a strongly sedating antidepressant. Combined CNS depression can produce excessive drowsiness, particularly when both are taken at bedtime.
Recommendation: If you take trazodone for sleep, avoid adding ashwagandha at the same time. If used together, do not drive the next morning until you know how the combination affects you.
Trazodone produces strong sedation through histamine H1 and 5-HT2A blockade. Alcohol is a CNS depressant. Combined use produces marked additive impairment of psychomotor function, alertness, and driving ability — documented to be most pronounced with sedating antidepressants like trazodone.
Recommendation: Avoid alcohol while taking trazodone, especially before driving. If you do drink, keep intake low and do not drive or operate machinery. Take trazodone at bedtime, not before social drinking.
Numbered references. Citations throughout the page link here.
Zheng Y, Lv T, Wu J et al.. Trazodone changed the polysomnographic sleep architecture in insomnia disorder: a systematic review and meta-analysis. Scientific reports. 2022
Meta-analysis of RCTs found trazodone significantly improved subjective sleep quality and reduced sleep onset latency compared to placebo in insomnia patients, with generally mild adverse effects.
Fink HA, MacDonald R, Rutks IR et al.. Trazodone for erectile dysfunction: a systematic review and meta-analysis. BJU international. 2003
Aishah A, Kim M, Gell L et al.. Effect of viloxazine and trazodone in obstructive sleep apnoea: a randomised, placebo-controlled, cross-over study. Thorax. 2025
Pal S, Chataway J, Swingler R et al.. Safety and efficacy of memantine and trazodone versus placebo for motor neuron disease (MND SMART): stage two interim analysis from the first cycle of a phase 3, multiarm, multistage, randomised, adaptive platform trial. The Lancet. Neurology. 2024
Eyob E, Shaw JS, Bakker A et al.. A Randomized-Controlled Trial Targeting Cognition in Early Alzheimer's Disease by Improving Sleep with Trazodone (REST). Journal of Alzheimer's disease : JAD. 2024
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