Amitriptyline

Clinical contraindication: None listed; No clinical contraindication identified.
Best available evidence: Mechanism only
Half-life: Not recorded

Named in state rules?

CONot named

ORNot named

NMPending

Cite asPsilodex: amitriptyline · v2026.10.02

Clinical data and state rules are separate facts. Both are shown; neither is a decision.

01 Interaction with psilocybin

5-HT2A antagonism and reuptake blockade; direction unclear. Lowers seizure threshold, QTc prolongation, arrhythmia, anticholinergic heat/tachycardia.

Human data with psilocybin: None known: no published human data with psilocybin

Evidence types on this record

ThMechanism only (theoretical)

6 listed · counted on reports

Anticholinergic: Blocks acetylcholine. Can cause a fast heart rate, dry mouth, reduced sweating and heat intolerance, and confusion, more so at high doses or in combination. Sources [1]
Blocks 5-HT2A (may blunt effects): Blocks the 5-HT2A receptor, the main receptor psilocybin acts through. Can reduce or block the psilocybin effect. Sources [2]
QT-prolonging: Lengthens the QT interval on an ECG, a measure of the heart’s electrical recovery between beats. A long QT raises the risk of a dangerous heart rhythm, more so with other QT-prolonging drugs or low potassium or magnesium. Sources [1]
Raises blood pressure or heart rate: Raises blood pressure or heart rate. Psilocybin raises both for several hours, so the effects can add. Sources [1]
Lowers seizure threshold or carries seizure risk: Makes a seizure more likely, or has been linked to seizures. Sources [1]
Serotonergic: Increases serotonin activity, for example by blocking its reuptake or releasing it. Psilocybin acts on serotonin receptors, so effects can add together. With antidepressant use, the psilocybin response can be weaker. Sources [1]

Official text governs

CO4 CCR 755-1

Not named

No provision names this medication or its class.

Colorado · checked 2026-09-30

OROAR 333-333

Not named

No provision names this medication or its class.

Oregon · checked 2026-09-30

NM7.35.3 NMAC (proposed)

Pending

New Mexico's clinical rules (proposed 7.35.3 NMAC) are not final. No provision naming this medication has been found.

New Mexico · checked 2026-09-30

None linked

No condition named in state rules is linked to this medication.

Amitriptyline Hydrochloride Tablets, USP · FDA label (DailyMed)
Brunton LL, Knollmann BC (eds). Goodman & Gilman’s The Pharmacological Basis of Therapeutics, 14th ed. McGraw Hill, 2023., p. 366