Angiotensin-Related Drugs

Beta Blockers



Mechanism of Action

Beta blockers decrease the heart rate and cardiac output, which lowers blood pressure. They are also used for cardiac arrhythmias and in treating angina pectoris.

Contraindications to Therapy:

Side Effects

Information about the specific Beta Blockers


Drug Dosage Regimen Drug Interactions

Acebutolol (Sectral ®)

Oral: 400-800 mg/day
Maximum 1200 mg/day

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal

Atenolol (Tenormin ®)

Oral: 50 mg once daily; may increase to 100 mg/day

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Salicylates - may reduce anti-hypertensive effects of beta-blockers

Betaxolol (Betoptic®; Kerlone ®)

Oral: 10 mg/day; may increase up to 20 mg/day after 7-14 days in order to obtain desired response

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Salicylates-may reduce anti-hypertensive effects of beta-blockers

Bisoprolol (Zebeta ™)

Oral: 5 mg once daily; may increase to 10 to 20 mg, daily, if necessary

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Salicylates-may reduce anti-hypertensive effects of beta-blockers

Carteolol (Cartrol ®)

Oral: 2.5 mg as a single daily dose
Maintenance dose-normally 2.5-5 mg once daily

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Salicylates-may reduce anti-hypertensive effects of beta-blockers

Carvedilol (Coreg®)

Oral:  6.25 mg twice daily;

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Increased cyclosporine levels in the blood
Salicylates - may reduce anti-hypertensive effects of beta-blockers

Labetalol (Trandate®, Normodyne®)

Oral: 100 mg twice daily; may be increased as needed every 2-3 days by 100 mg until desired response achieved; usual dosage-200-400 mg twice daily

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Cimetidine – increased blood levels of labetalol
Halothane anesthesia - excessive low blood pressure may occur
Sulfonylurea hypoglycemic drugs – beta-blockers may mask low blood sugar
Salicilyates  -may reduce antihypertensive effects of beta-blockers

(Metoprolol
Lopressor®)

Oral: 100-450 mg/day in 2-3 divided doses; begin with 50 mg twice daily and increase doses weekly to desired effect

Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Sulfonylurea hypoglycemic drugs - beta-blockers may mask low blood sugar

 

Nadolol (Corgard®)

Oral: Initial-40 mg/day; increase dosage gradually by 40-80 mg increments at 3-7 day intervals until desired effect is achieved

Albuterol - effects may be blocked by beta-blockers
Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Sulfonylurea hypoglycemic drugs - beta-blockers may mask low blood sugar

Penbutolol (Levatol®)

Oral:
Angina pectoris:
10-40 mg once dailyHypertension:usual dose-20 mg once daily; higher doses (40-80 mg) have not demonstrated greater effectiveness

Clonidine - hypertensive crisis upon drug withdrawal
Verapamil - may cause low blood pressure and slow heart rate

Pindolol (Visken®)

Oral:
Initial-5 mg twice daily; increase as necessary by 10 mg/day every 3-4 weeks
Maximum daily dosage- 60 mg/day

Albuterol-Its effects may be blocked by beta-blockers
Alpha blockers – increased risk of low pressure upon standing
Clonidine - hypertensive crisis upon drug withdrawal
Sulfonylurea hypoglycemic drugs - beta-blockers may mask low blood sugar
Epinephrine-pindolol may cause hypertension

Propranolol (Inderal®, various)

Oral: Initial-40 mg twice daily; increase dosage every 3-7 days; usual dose is less than or equal to 320 mg divided in 2-3 doses/day; Maximum daily dose-640 mg/day

Albuterol-Its effects may be blocked by beta-blockers
Reserpine-increases the effects of propranolol
Sulfonylurea hypoglycemic drugs - beta-blockers may mask low blood sugar

Propranolol long-acting (Inderal-LA®)

Sotalol (Betaspace®)

Oral: Initial-80 mg twice daily; dose may be increased gradually to 240-320 mg/day

Antacids(aluminum & magnesium)-decrease sotalol levels in the blood
Clonidine - hypertensive crisis upon drug withdrawal

Timolol (Biocadren®)

Oral:
Initial-10 mg twice daily; increase gradually every 7 days; usual dosage=20-40 mg/day in 2 divided doses
Maximum dosage-60 mg/day

Sulfonylurea hypoglycemic drugs - beta-blockers may mask low blood sugar