Drug Gene Type Source Trihexyphenidyl hydrochloride CHRM1 - D1 PubChem Trihexyphenidyl hydrochloride DRD2 - D1 PubChem Trihexyphenidyl hydrochloride CHRM5 - D1 PubChem Trihexyphenidyl hydrochloride CHRM4 - D1 PubChem Trihexyphenidyl hydrochloride NPY2R - D1 PubChem Trihexyphenidyl hydrochloride ABCB1 - D1 PubChem