Nadolol

Nadolol
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Nadolol is a non-selective beta blocker used in the treatment of hypertension and angina pectoris. It is also used in the management of certain types of arrhythmias and for the prevention of migraine headaches. Nadolol is known for its long duration of action, which allows for once-daily dosing.

Pharmacology

Nadolol works by blocking the action of epinephrine and norepinephrine on beta-adrenergic receptors, which are part of the sympathetic nervous system. This action results in a decrease in heart rate, cardiac output, and blood pressure. Nadolol is non-selective, meaning it blocks both beta-1 and beta-2 adrenergic receptors.

Medical uses

Nadolol is primarily used to treat:

• Hypertension
• Angina pectoris
• Certain types of arrhythmias
• Prevention of migraine headaches

Hypertension

Nadolol is effective in lowering blood pressure by reducing cardiac output and inhibiting the release of renin from the kidneys. It is often used in combination with other antihypertensive agents for better control of blood pressure.

Angina pectoris

In patients with angina, nadolol reduces the frequency and severity of angina attacks by decreasing myocardial oxygen demand through its effects on heart rate and contractility.

Arrhythmias

Nadolol is used in the management of certain arrhythmias, particularly those that are exacerbated by sympathetic stimulation.

Migraine prevention

Nadolol is sometimes used off-label for the prevention of migraine headaches, as it can reduce the frequency and severity of attacks.

Side effects

Common side effects of nadolol include:

• Bradycardia
• Fatigue
• Dizziness
• Cold extremities
• Gastrointestinal disturbances

Serious side effects may include:

• Bronchospasm
• Heart failure
• Hypotension

Contraindications

Nadolol should not be used in patients with:

• Asthma or chronic obstructive pulmonary disease (COPD)
• Bradycardia
• Heart block
• Cardiogenic shock

Mechanism of action

Nadolol blocks beta-adrenergic receptors, which are involved in the "fight or flight" response. By blocking these receptors, nadolol reduces the effects of stress hormones like epinephrine, leading to a decrease in heart rate and blood pressure.

Pharmacokinetics

Nadolol is well absorbed from the gastrointestinal tract, but it has a low bioavailability due to first-pass metabolism. It is not metabolized by the liver and is excreted unchanged in the urine. The half-life of nadolol is approximately 20 to 24 hours, allowing for once-daily dosing.

Related pages

• Beta blocker
• Hypertension
• Angina pectoris
• Arrhythmia
• Migraine