Propranolol is a competitive antagonist which specifically competes with beta-adrenergic receptor stimulating agents for available beta-receptor sites. Propranolol is a competitive antagonist which specifically competes with beta-adrenergic receptor stimulating agents for available beta-receptor sites. Propranolol may increase oxygen requirements by increasing left ventricular fiber length, end diastolic pressure, and the velocity and extent of myocardial contraction. Propranolol may mask the symptoms of low blood sugar such as increased heart rate, tremor and nausea.
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