Propranolol is a competitive antagonist which specifically competes with beta-adrenergic receptor stimulating agents for available beta-receptor sites. Propranolol from Inderal capsules is almost completely absorbed from the gastrointestinal tract. Propranolol reduces the workload of the heart and so decreases its demand for oxygen. Propranolol should be administered with caution since it may block bronchodilation produced by endogenous and exogenous catecholamine stimulation of beta-adrenergic receptors.
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