Doxylamine (Unisom) and Ketamine Therapy | Tovani Health
Unisom (Doxylamine) — First-generation antihistamine (OTC sleep aid)
Verdict at Tovani Health
Compatible; sedation stacking is the main consideration.
Doxylamine and ketamine are compatible. As with diphenhydramine, doxylamine is strongly sedating and anticholinergic. The sedation window can stack with a morning session if you take it at bedtime.
If you take Unisom regularly and are considering at-home ketamine therapy, the combination is safe with monitoring or dose adjustment. This page covers the brief pharmacologic context and what we do at intake.
How Unisom interacts with ketamine
Doxylamine is an H1 antagonist with strong sedative and anticholinergic effects. Similar profile to diphenhydramine, with a slightly longer half-life.
What we do at intake
Disclose dose and how often you use it. Morning sessions are fine if you take it occasionally for sleep; nightly use warrants more careful timing.
Bottom line
Doxylamine and ketamine are compatible. As with diphenhydramine, doxylamine is strongly sedating and anticholinergic. The sedation window can stack with a morning session if you take it at bedtime.
Frequently Asked Questions
Is Unisom a problem on session day?
If you took it the night before, usually fine. We just want to know about it.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Unisom (Doxylamine) 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.
- Ketamine: A Review of Clinical Pharmacokinetics and Pharmacodynamics in Anesthesia and Pain Therapy. Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI.. Clinical Pharmacokinetics. 2016. PMID: 27028535
Comprehensive clinical pharmacokinetics/pharmacodynamics review of ketamine including CYP-mediated drug interactions (CYP3A4, CYP2B6).
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 16, 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.