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Bretylium (also bretylium tosylate) is an antiarrhythmic agent. It blocks the release of noradrenaline from nerve terminals. In effect, it decreases output from the peripheral sympathetic nervous system. It also acts by blocking K+ channels and is considered a class III antiarrhythmic. The dose is 5–10 mg/kg and side effects are high blood pressure followed by low blood pressure and ventricular ectopy.
Originally introduced in 1959 for the treatment of hypertension. Its use as an antiarrhythmic for ventricular fibrilation was discovered and patented by Marvin Bacaner in 1969 at the University of Minnesota.
The American Heart Association removed Bretylium from their 2000 ECC/ACC guidelines due to its unproven efficacy and ongoing supply problems. Many have cited these supply problems as an issue of raw materials needed in the production of Bretylium. By the release of the AHA 2005 ECC/ACC guidelines there is no mention of Bretylium and it is virtually unavailable throughout most of the world.
As of June 8, 2011 Bretylium Tosylate is permanently no longer available in the US after request of Hospira Inc. to withdraw its NDA from the market. Bretylium will remain on the FDA's discontinued drug list since its withdrawal was not the result of a safety or effectiveness concern.
It was used in emergency medicine, cardiology, and other specialties throughout the 1980s-1990s for the acute management of ventricular tachycardia and ventricular fibrillation refractory to other first line treatments such as defibrillation or lidocaine.
It is used in physiological and pharmacological research as an inhibitor of sympathetic transmission. Its mechanism of action is the inhibition of neurotransmitter release from sympathetic nerve terminals, both by the inhibition of action potentials in the nerve terminals and by other mechanisms. Its specificity for sympathetic nerves is achieved because it is a substrate for the noradrenaline transporter; hence, it accumulates inside nerve terminals which have this transporter.
Quaternization of o-bromo-N,N-dimethylbenzylamine with ethyl-p-toluenesulfonate yields bretylium sulfonate.
- Tiku PE, Nowell PT (December 1991). "Selective inhibition of K(+)-stimulation of Na,K-ATPase by bretylium". Br. J. Pharmacol. 104 (4): 895–900. PMC 1908819. PMID 1667290. doi:10.1111/j.1476-5381.1991.tb12523.x.
- "the treatment of hypertension".
- "patent". Retrieved 2014-02-06.
- "ACS". Retrieved 2008-09-23.[dead link]
- K. L. Brain & T. C. Cunnane (2008). "Bretylium abolishes neurotransmitter release without necessarily abolishing the nerve terminal action potential in sympathetic terminals". British journal of pharmacology 153 (4): 831–839. PMC 2259200. PMID 18071295. doi:10.1038/sj.bjp.0707623.
- A. L. BOURA, F. C. COPP, W. G. DUNCOMBE, A. F. GREEN & A. McCOUBREY (June 1960). "The selective accumulation of bretylium in sympathetic ganglia and their postganglionic nerves". British journal of pharmacology and chemotherapy 15: 265–270. PMC 1481934. PMID 13803289. doi:10.1111/j.1476-5381.1960.tb01242.x.
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