Mechanism of Action
Description: Trihexyphenidyl HCl is a tertiary amine antimuscarinic which exerts a direct inhibitory effect on the parasympathetic nervous system. It also exhibits a direct spasmolytic action on smooth muscle, weak mydriatic, antisialagogue and cardiovagal blocking effects.
On Set: W/in 1 hr.
Duration: 6-12 hr.
Pharmacokinetics:
Absorption: Rapidly and well absorbed from the GI tract. Time to peak plasma concentration: 1.3 hr.
Metabolism: Undergoes hydroxylation of the alicyclic group.
Excretion: Via urine (as unchanged drug) and bile. Elimination half-life: 33 hr.