L-Arginine and Ketamine Therapy | Tovani Health
L-Arginine HCl (L-Arginine) — Conditionally essential amino acid (NO precursor; circulation, pump, ED)
Verdict at Tovani Health
Fully compatible — mild vasodilator, but the NO effect is too modest to stack meaningfully with ketamine.
L-arginine and ketamine have no clinically significant interaction. As a nitric oxide (NO) precursor via the NOS pathway, arginine produces mild vasodilation — commonly used in supplements for 'pump,' circulation, and erectile function. The vasodilatory effect is modest and short-lived; clinically meaningful interaction with ketamine's transient pressor effect is unlikely. The well-known interaction worth flagging — high-dose arginine plus PDE5 inhibitors (sildenafil, tadalafil) can compound BP-lowering, and arginine is contraindicated post-MI in some literature — is independent of KAP.
If you take L-Arginine HCl regularly and are considering at-home ketamine therapy, the combination is generally safe at therapeutic doses. This page covers the brief pharmacologic context and what we do at intake.
How L-Arginine HCl interacts with ketamine
L-arginine is the substrate for nitric oxide synthase (NOS). Oral absorption is variable; first-pass arginase metabolism limits systemic effect. L-citrulline (downstream NO precursor) is often used instead for higher bioavailability.
What we do at intake
Continue as you normally take it. Disclose if you're using it alongside a PDE5 inhibitor or have a cardiac history.
Bottom line
L-arginine and ketamine have no clinically significant interaction. As a nitric oxide (NO) precursor via the NOS pathway, arginine produces mild vasodilation — commonly used in supplements for 'pump,' circulation, and erectile function. The vasodilatory effect is modest and short-lived; clinically meaningful interaction with ketamine's transient pressor effect is unlikely. The well-known interaction worth flagging — high-dose arginine plus PDE5 inhibitors (sildenafil, tadalafil) can compound BP-lowering, and arginine is contraindicated post-MI in some literature — is independent of KAP.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on L-Arginine HCl (L-Arginine) 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.
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 23, 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.