Chlorpromazine and Ketamine: What to Monitor
Thorazine (Chlorpromazine) — Typical (first-generation) antipsychotic / phenothiazine
Verdict at Tovani Health
Compatible; older agent with heavy sedation, anticholinergic, and QT considerations.
Chlorpromazine and ketamine are compatible. As an older first-generation antipsychotic, chlorpromazine has heavier sedation, anticholinergic, and QT-prolongation effects than newer agents. Less commonly used today, but still seen for refractory hiccups, intractable migraine, and some chronic psychotic disorders.
If you take Thorazine regularly and are considering at-home ketamine therapy, the combination is safe with monitoring or modest dose adjustment. This page covers the brief pharmacologic context and what we do at intake.
How Thorazine interacts with ketamine
Chlorpromazine antagonizes D2, 5-HT2, H1, M1, and alpha-1 receptors broadly. Older agent with broad receptor profile.
What we do at intake
Disclose dose and indication. Baseline EKG. Morning sessions are preferred given the heavy sedation.
Bottom line
Chlorpromazine and ketamine are compatible. As an older first-generation antipsychotic, chlorpromazine has heavier sedation, anticholinergic, and QT-prolongation effects than newer agents. Less commonly used today, but still seen for refractory hiccups, intractable migraine, and some chronic psychotic disorders.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Thorazine (Chlorpromazine) at intake. The eligibility check takes 5 minutes and gives you an honest answer about whether at-home ketamine fits your specific situation.
FL and NJ residents only. Benjamin Soffer, DO — Tovani Health.
Sources
The verdict and clinical guidance on this page are based on the following peer-reviewed literature and FDA prescribing information.
- From chlorpromazine to clozapine--antipsychotic adverse effects and the clinician's dilemma. Abidi S, Bhaskara SM. Canadian Journal of Psychiatry. 2003. PMID: 14733456
- Drug-induced QT Interval Prolongation in the Intensive Care Unit. Etchegoyen CV, Keller GA, Mrad S. Current Clinical Pharmacology. 2017. PMID: 29473523
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 17, 2026. Dr. Soffer is a board-certified physician (American Board of Internal Medicine) licensed in Florida and New Jersey, prescribing at-home ketamine therapy through Tovani Health.
This page is general information about how this medication interacts with at-home ketamine therapy at Tovani Health. It is not a substitute for medical advice from your prescribing physician about your specific situation. Always discuss medication changes with the doctor who prescribed them.