Acebutolol is well tolerated in properly selected patients. Most adverse reactions have been mild, not required discontinuation of therapy, and tended to decrease as duration of treatment increases.
The following table shows the frequency of treatment-related side effects derived from controlled clinical trials in patients with hypertension, angina pectoris, and arrhythmia. These patients received acebutolol, propranolol, or hydrochlorothiazide as monotherapy, or placebo.
The following selected (potentially important) side effects were seen in up to 2% of acebutolol patients:
Cardiovascular: hypotension, bradycardia, heart failure.
Central Nervous System: anxiety, hyper/hypoesthesia, impotence.
Gastrointestinal: vomiting, abdominal pain.
Genitourinary: dysuria, nocturia.
Liver and Biliary System: A small number of cases of liver abnormalities (increased SGOT, SGPT, LDH) have been reported in association with acebutolol therapy. In some cases increased bilirubin or alkaline phosphatase, fever, malaise, dark urine, anorexia, nausea, headache, and/or other symptoms have been reported. In some of the reported cases, the symptoms and signs were confirmed by rechallenge with acebutolol. The abnormalities were reversible upon cessation of acebutolol therapy.
Musculoskeletal: back pain, joint pain.
Respiratory: pharyngitis, wheezing.
Special Senses: conjunctivitis, dry eye, eye pain.
Autoimmune: In extremely rare instances, systemic lupus erythematosus has been reported.
The incidence of drug-related adverse effects (volunteered and solicited) according to acebutolol dose is shown below. (Data from 266 hypertensive patients treated for 3 months on a constant dose.)
Potential Adverse Events
In addition, certain adverse effects not listed above have been reported with other β-blocking agents and should also be considered as potential adverse effects of acebutolol.
Central Nervous System: Reversible mental depression progressing to catatonia (an acute syndrome characterized by disorientation for time and place), short-term memory loss, emotional lability, slightly clouded sensorium, and decreased performance (neuropsychometrics).
Cardiovascular: Intensification of AV block (see CONTRAINDICATIONS).
Allergic: Erythematous rash, fever combined with aching and sore throat, laryngospasm, and respiratory distress.
Hematologic: Agranulocytosis, nonthrombocytopenic, and thrombocytopenic purpura.
Gastrointestinal: Mesenteric arterial thrombosis and ischemic colitis.
Miscellaneous: Reversible alopecia and Peyronie’s disease. The oculomucocutaneous syndrome associated with the β-blocker practolol has not been reported with acebutolol during investigational use and extensive foreign clinical experience.
No specific information on emergency treatment of overdosage is available for acebutolol.
However, overdosage with other β-blocking agents has been accompanied by extreme bradycardia, advanced atrioventricular block, intraventricular conduction defects, hypotension, severe congestive heart failure, seizures, and in susceptible patients, bronchospasm and hypoglycemia. Although specific information on the emergency treatment of acebutolol overdose is not available on the basis of the pharmacological actions and the observations in treating overdoses with other β-blockers, the following general measures should be considered:
- Empty stomach by emesis or lavage.
- Bradycardia: IV atropine (1 to 3 mg in divided doses). If antivagal response is inadequate, administer isoproterenol cautiously since larger than usual doses of isoproterenol may be required.
- Persistent hypotension in spite of correction of bradycardia: Administer vasopressor (e.g., epinephrine, norepinephrine, dopamine, or dobutamine) with frequent monitoring of blood pressure and pulse rate.
- Bronchospasm: A theophylline derivative, such as aminophylline and/or parenteral β2-stimulant, such as terbutaline.
- Cardiac failure: Digitalize the patient and/or administer a diuretic. It has been reported that glucagon is useful in this situation.
Acebutolol is dialyzable.
The initial dosage of acebutolol in uncomplicated mild-to-moderate hypertension is 400 mg. This can be given as a single daily dose, but in occasional patients twice daily dosing may be required for adequate 24-hour blood-pressure control. An optimal response is usually achieved with dosages of 400 to 800 mg per day, although some patients have been maintained on as little as 200 mg per day. Patients with more severe hypertension or who have demonstrated inadequate control may respond to a total of 1200 mg daily (administered b.i.d.), or to the addition of a second antihypertensive agent. Beta-1 selectivity diminishes as dosage is increased.
The usual initial dose of acebutolol is 400 mg daily given as 200 mg b.i.d. Dosage should be increased gradually until an optimal clinical response is obtained, generally at 600 to 1200 mg per day. If treatment is to be discontinued, the dosage should be reduced gradually over a period of about two weeks.
Older patients have an approximately 2-fold increase in bioavailability and may require lower maintenance doses. Doses above 800 mg/day should be avoided in the elderly.
Acebutolol hydrochloride capsules, USP are available as follows:
200 mg: Hard gelatin capsules with bright orange opaque body printed radially “669” with black ink and lavender opaque cap printed radially “Amneal” with black ink.
Bottles of 100 NDC 65162-669-10
Bottles of 500 NDC 65162-669-50
400 mg: Hard gelatin capsules with bright orange opaque body printed radially “670” with black ink and lavender opaque cap printed radially “Amneal” with black ink.
Bottles of 30 NDC 65162-670-03
Bottles of 100 NDC 65162-670-10
Bottles of 500 NDC 65162-670-50
Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].
Protect from light. Keep tightly closed. Dispense in a tight, light-resistant container.
Bridgewater, NJ 08807
200 mg Label
400 mg Label
| ACEBUTOLOL HYDROCHLORIDE |
acebutolol hydrochloride capsule
| ACEBUTOLOL HYDROCHLORIDE |
acebutolol hydrochloride capsule
|Labeler — Amneal Pharmaceuticals LLC (123797875)|
|Amneal Pharmaceuticals of New York, LLC||123797875||analysis (65162-669), analysis (65162-670), label (65162-669), label (65162-670), manufacture (65162-669), manufacture (65162-670), pack (65162-669), pack (65162-670)|
Revised: 09/2022 Amneal Pharmaceuticals LLC
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