Intrinsic sympathomimetic activity
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Some beta blockers (e.g. oxprenolol, pindolol, penbutolol and acebutolol) exhibit intrinsic sympathomimetic activity (ISA). These agents are capable of exerting low level agonist activity at the β-adrenergic receptor while simultaneously acting as a receptor site antagonist. These agents, therefore, may be useful in individuals exhibiting excessive bradycardia with sustained beta blocker therapy.
Agents with ISA are not used in post-myocardial infarction as they have not been demonstrated to be beneficial. They may also be less effective than other beta blockers in the management of angina and tachyarrhythmia.[1]
References
- ↑ Editor Rossi S, ed. (2006). Australian Medicines Handbook. Adelaide: Australian Medicines Handbook.