Erythromycin (E-Mycin) and Ketamine Therapy | Tovani Health
E-Mycin (Erythromycin) (also: EryTab, Ery-Tab, Erythrocin) — Macrolide antibiotic (older; strong CYP3A4 inhibitor)
Verdict at Tovani Health
Compatible; CYP3A4 inhibition during the course can raise ketamine levels.
Erythromycin and ketamine are compatible with timing awareness. Erythromycin is a strong CYP3A4 inhibitor on the same magnitude as clarithromycin (much stronger than azithromycin). Combining during an active course can meaningfully raise ketamine plasma exposure. Also used off-label at low doses as a prokinetic for gastroparesis — same CYP3A4 concern applies.
If you take E-Mycin 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 E-Mycin interacts with ketamine
Erythromycin disrupts bacterial protein synthesis via 50S ribosomal subunit binding and strongly inhibits CYP3A4 throughout dosing. Ketamine clearance via CYP3A4 slows, raising plasma exposure. Also a motilin receptor agonist (the prokinetic effect).
What we do at intake
Disclose any active erythromycin course. We typically wait until the course is complete and a few days of washout before running sessions. For chronic low-dose prokinetic use (gastroparesis), individual review.
Bottom line
Erythromycin and ketamine are compatible with timing awareness. Erythromycin is a strong CYP3A4 inhibitor on the same magnitude as clarithromycin (much stronger than azithromycin). Combining during an active course can meaningfully raise ketamine plasma exposure. Also used off-label at low doses as a prokinetic for gastroparesis — same CYP3A4 concern applies.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on E-Mycin (Erythromycin) 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 Anesthetic and Pain Therapy. Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI. Clinical Pharmacokinetics. 2016. PMID: 27028535
Reviews CYP3A4 inhibitors affecting ketamine clearance; strong macrolide inhibitors substantially raise exposure.
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 22, 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.