The addition of trazodone to lurasidone and valproic acid can precipitate serotonin syndrome.
A patient developed probable serotonin syndrome (SS) within hours of adding 100 mg trazodone to a regimen including lurasidone and valproic acid. Symptoms included chills, nausea, sweating, dizziness, muscle stiffness, and tremor, which resolved over 48 hours. The case suggests that this drug combination can cause excessive serotoninergic activity via multiple mechanisms.
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The addition of trazodone to lurasidone and valproic acid can precipitate serotonin syndrome. The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 32/100 (low).
The Claim
The addition of trazodone to lurasidone and valproic acid can precipitate serotonin syndrome.
This conclusion is most relevant to: A single patient (case report) with insomnia, on a medication regimen including lurasidone and valproic acid.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Probable Serotonin Syndrome Precipitated by the Addition of Trazodone to Lurasidone and Valproic Acid: A Case Report. (Sante mentale au Quebec, 2026) — A patient developed probable serotonin syndrome (SS) within hours of adding 100 mg trazodone to a regimen including lurasidone and valproic acid. Symptoms included chills, nausea, sweating, dizziness, muscle stiffness, and tremor, which resolved over 48 hours. The case suggests that this drug combination can cause excessive serotoninergic activity via multiple mechanisms.
How It Works
The proposed biological pathway:
- ▸Trazodone inhibits serotonin reuptake
- ▸Lurasidone acts as a 5-HT1A partial agonist
- ▸Valproic acid may increase central serotoninergic neurotransmission
- ▸Result: Excessive serotoninergic activity leading to serotonin syndrome
Who Might Benefit
Evidence fit by population:
- ▸A single patient (case report) with insomnia, on a medication regimen including lurasidone and valproic acid
Recommended Dose
100 mg trazodone
Limitations & Caveats
Important context when interpreting this evidence:
- ▸No physical examination or laboratory tests were performed when the patient was symptomatic
- ▸Single case report with no control group, limiting generalizability
- ▸Potential confounding from other medications (estradiol, dexlansoprazole, spironolactone)
Frequently Asked Questions
What is serotonin syndrome?▼
Serotonin syndrome is a serious condition caused by excessive serotonin receptor activation, characterized by altered mental status, autonomic instability, and neuromuscular abnormalities.
Can trazodone alone cause serotonin syndrome?▼
Trazodone alone is less likely to cause serotonin syndrome; it is often associated with combinations of serotonergic drugs, such as SSRIs or other agents like lurasidone and valproic acid.
What medications were involved in this case?▼
The patient was taking trazodone, lurasidone, valproic acid, estradiol, dexlansoprazole, and spironolactone. The addition of trazodone was suspected as the trigger.
How long did the symptoms last?▼
Symptoms began a few hours after taking trazodone and gradually subsided over the next 48 hours.
References
- 1.Do A, Kachichian R, Vincent P. “Probable Serotonin Syndrome Precipitated by the Addition of Trazodone to Lurasidone and Valproic Acid: A Case Report..” Sante mentale au Quebec, 2026. PMID: 42490704