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Methylatropine is an antagonist of muscarinic acetylcholine receptors (IC50 = <0.1 nM in a radioligand binding assay using isolated porcine brain membranes) and a derivative of atropine .1,2 It reduces acetylcholine-induced decreases in blood pressure in rats when administered intravenously with an ED50 value of 5.5 µg/kg.2 Methylatropine reduces salivation, induces mydriasis, and increases heart rate in dogs.3

1.Schmeller, T., Sporer, F., Sauerwein, M., et al.Binding of tropane alkaloids to nicotinic and muscarinic acetylcholine receptorsPharmazie50(7)493-495(1995) 2.Brezenoff, H.E., Xiao, Y.-F., and Vargas, H.A comparison of the central and peripheral antimuscarinic effects of atropine and methylatropine injected systemically and into the cerebral ventriclesLife Sci.42(8)905-911(1988) 3.Albanus, L.Central and peripheral effects of anticholinergic compoundsActa Pharmacol. Toxicol. (Copenh)28(4)305-326(1970)

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