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Trihexyphenidyl

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Pharmacology
Receptor activity
M1 receptorMuscarinic acetylcholine receptor M4Muscarinic acetylcholine receptor M1UncheckedMuscarinic acetylcholine receptor M3Muscarinic acetylcholine receptor M5Muscarinic acetylcholine receptor M2Sigma non-opioid intracellular receptor 1
CHRM1CYP2D6CHRM2CHRM3CHRM4CHRM5SIGMAR1
Half-lifeThe mean elimination half life of trihexyphenidyl is 3.2 ± 0.3 hours. Twenty-four male subjects were randomized to receive two oral dosage forms of trihexyphenidyl HCl (alpha-cyclohexyl-alpha-phenyl-1-piperidinepropanol HCl). The dosage regimens were (1) a 5-mg immediate release (IR) tablet given twice daily at time zero and 12 hr later, and (2) two 5-mg sustained-release (SR) capsule formulations given daily. ... The mean elimination half-life (t1/2) was similar (p greater than 0.05) after the SR (10.1 hr) and IR (8.7 hr) formulations. /Trihexylphenidyl hydrochloride/ Using a sensitive radioreceptor assay for anticholinergic drugs, trihexyphenidyl /was assayed/ in human serum and ... its pharmacokinetics following short-term and long-term administration to patients with dystonia /was studied/. ... Elimination followed first-order kinetics and was rapid, with a half-life of 3.7 + or - 0.4 (SEM) hours. There was no relationship between half-life and peak serum level, age, duration of therapy, or etiology or severity of dystonia. ...
Protein bindingData regarding the extent of trihexyphenidyl protein binding in plasma are not readily available. Trihexyphenidyl is 36.13-41.92% bound to albumin under controlled conditions in a dialysis bag.

PsychonautWiki summary

Deliriant use is associated with highly uncomfortable and/or dangerous experiences. Deliriants are highly unpredictable and may result in erratic behaviors, self-injury, hospitalization, or death. It should be noted that most individuals do not choose to repeat the experience due to its unpleasant nature.

Fact-sheets from PsychonautWiki. Harm-reduction reference only — not medical advice.