Amiodarone HCl is an anti-arrhythmic drug [1].
Amiodarone HCl has shown a non-competitive inhibition of the chronotropic effect of isoproterenol with a pD’ value of ~4.17. In addition, Amiodarone HCl has been reported to inhibit the norepinephrine-induced contractions in a non-competitive type with a pD’ value of about 4.06. Besides, all the results have been suggested that Amiodarone HCl does not compete with the agonists at their respective recognition sites. Amiodarone HCl has been found to be a different antagonizes types of anonists: β1-adrenergic agonists like isoproterenol, α-adrenergic agonists like norepinephrine and glucagon. Apart from these, Amiodarone HCl has exhibited tissular specificity. The adrenergic (glucagon) antagonism has been shown only on the heart and the arteries. Amiodarone HCl has noted no cpinephrine-induced lipolysis of the epididymal fat pad [1].
References:
[1] Polster P, Broekhuysen J. The adrenergic antagonism of amiodarone. Biochem Pharmacol. 1976 Jan 15;25(2):131-4.