Bretylol Side Effects
Generic name: bretylium
Medically reviewed by Drugs.com. Last updated on Jun 27, 2022.
Note: This document contains side effect information about bretylium. Some of the dosage forms listed on this page may not apply to the brand name Bretylol.
For the Consumer
Applies to bretylium: injection solution
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Dizziness or passing out.
- Very bad headache.
- An abnormal heartbeat that is new or worse.
What are some other side effects of this drug?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Upset stomach or throwing up.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.
For Healthcare Professionals
Applies to bretylium: injectable solution, intravenous solution
Postural hypotension has occurred in most patients and was usually reversible with volume expansion or catecholamine infusion such as dopamine or epinephrine. It is recommended that patients remain supine until blood pressure changes stabilize. Some degree of supine hypotension occurred in approximately 50% of patients. The degree of hypotension did not appear to be dose-related and discontinuation was usually not required.
Bretylium administration causes an initial release of norepinephrine which may result in increased blood pressure or aggravation of arrhythmias. These effects are usually transient and do not generally require discontinuation of bretylium (the active ingredient contained in Bretylol) [Ref]
Cardiovascular side effects including hypotension have been commonly reported during bretylium therapy. Hypotension occurs most frequently during intravenous administration. Postural hypotension has also been reported even when administered in a supine position. Other cardiovascular side effects have included transient hypertension, induction of new arrhythmias, bradycardia, precipitation of angina, and substernal pressure sensation. Flushing has been reported.[Ref]
To minimize nausea and vomiting due to rapid intravenous infusion, it is recommended that bretylium (the active ingredient contained in Bretylol) be diluted in at least 50 cc of 5% dextrose or normal saline and infused over 10 to 15 minutes.[Ref]
Local pain at the site of intramuscular injections has occurred. Administration sites should be rotated to prevent atrophy, fibrosis, or necrosis of muscle tissue, or vascular degeneration and inflammatory changes.[Ref]
Nervous system side effects of headache, sweating, and hyperthermia have occurred.[Ref]
At least two cases of extreme hyperthermia to 108 degrees Fahrenheit have been reported. In both cases, the temperature fell rapidly after bretylium was discontinued and normalized in less than 16 hours. The mechanism for this effect is unknown.[Ref]
Respiratory side effects including shortness of breath and nasal congestion have been reported rarely. A causal relationship between the side effect and the use of bretylium (the active ingredient contained in Bretylol) has not been clearly established.[Ref]
Psychiatric side effects including confusion, anxiety, psychoses, and emotional lability have been reported rarely. A causal relationship between the side effect and the use of bretylium (the active ingredient contained in Bretylol) has not been clearly established.[Ref]
Dermatologic side effects including erythematous macular rash have been reported rarely. A causal relationship between the side effect and the use of bretylium (the active ingredient contained in Bretylol) has not been clearly established.[Ref]
More about Bretylol (bretylium)
- Drug interactions
- Dosage information
- During pregnancy or Breastfeeding
- Drug class: group III antiarrhythmics
Related treatment guides
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2. Cohen HC, Gozo EG, Langendorf R, et al. "Response of resistant ventricular tachycardia to bretylium: relation to site to ectopic focus and location of myocardial disease." Circulation 47 (1973): 331-40
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16. "Product Information. Bretylol (bretylium)." DuPont Pharmaceuticals (2002):
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Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.