adrenergic beta receptor drug pathway - beta-agonist and beta-blocker adrenergic beta receptor agonist and beta-blocker pharmacokinetics pathway 2010-07-01T08:56:44Z PW:0000800 The pathway of processing - absorption, distribution, metabolism or elimination - of beta adrenergic receptor drugs. The beta-agonists are used to stimulate while the beta-blockers are used to inhibit the action of adrenergic beta receptors, as necessary. Adrenergic beta receptors are G-protein coupled receptors that in response to epinephrine or norepinephrine elicit various sympathetic responses important for proper cardiac function and in the case of beta2 receptor, smooth muscle relaxation and bronchodilation. Genetic variations can result in changes in the availability of the drug. pathway vpetri