propranolol, Inderal, Inderal LA, Innopran XL

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GENERIC NAME: propranolol

BRAND NAMES: Inderal, Inderal LA, Innopran XL

DRUG CLASS AND MECHANISM: Propranolol is a beta-adrenergic blocking agent that is used for treating high blood pressure, heart pain (angina), abnormal rhythms of the heart, and some neurologic conditions. Examples of other beta-adrenergic blockers include metoprolol (Lopressor), atenolol (Tenormin), and timolol (Blocadren).

Neurotransmitters are chemicals that are produced and released by nerves in order to communicate with each other. The released neurotransmitters attach to receptors on other cells and induce changes within the receptor-containing cells. Norepinephrine is a neurotransmitter that is used by the sympathetic nervous system, a portion of the involuntary nervous system. Nerves of the sympathetic nervous system release norepinephrine that binds to beta receptors on other cells. Propranolol inhibits the sympathetic nervous system by blocking the beta receptors on the nerves of the sympathetic system. Since stimulation of the sympathetic nervous system is responsible for increasing the rate with which the heart beats, by blocking the action of these nerves propranolol reduces the heart rate and is useful in treating abnormally rapid heart rhythms.

Propranolol also reduces the force of contraction of heart muscle and thereby lowers blood pressure. By reducing the heart rate and the force of muscle contraction, propranolol reduces the need for oxygen by heart muscle. Since heart pain (angina pectoris) occurs when oxygen demand of the heart muscle exceeds the supply of oxygen, propranolol, by reducing the demand for oxygen, is helpful in treating heart pain. The FDA approved propranolol in November 1967.

PRESCRIPTION: Yes

GENERIC AVAILABLE: Yes

PREPARATIONS: Tablets: 10, 20, 40, 60, and 80 mg. Capsules: 60, 80, 120, and 160 mg. Oral Solution: 20 mg/5 ml, Injection: 1 mg/ml

STORAGE: Tablets and capsules should be stored at room temperature, 15 to 30 C (59 to 86 F), in a tightly closed container.

PRESCRIBED FOR: Propranolol is prescribed for patients with high blood pressure (hypertension). It is also used to treat chest pain (angina pectoris) related to coronary artery disease. Propranolol is useful in slowing and regulating certain types of abnormally rapid heart rates (tachycardias). Other uses for propranolol include the prevention of migraine headaches and the treatment of certain types of tremors (familial or hereditary essential tremors). Propranolol is commonly used in persons with thyrotoxicosis (high blood levels of thyroid hormone) to slow down rapid heart rate and tremor.

DOSING: The recommended dose for hypertension using short acting formulations is 80-240 mg twice daily. The maximum dose is 640 mg daily.

The usual dose using long acting formulations is 80-160 mg daily.

The recommended dose for chest pain is 80-320 mg daily using short acting formulations and 80-160 mg daily using long acting formulations.

The usual dose for treatment of abnormal heart rhythms is 10-30 mg 3-4 times daily of short acting formulations.

The recommended dose for preventing migraines is 80-240 mg daily.

DRUG INTERACTIONS: Calcium channel blockers and digoxin (Lanoxin) can lower of blood pressure and heart rate to dangerous levels when administered together with propranolol. Propranolol can mask the early warning symptoms of low blood sugar (hypoglycemia) and should be used with caution in patients receiving treatment for diabetes. Propranolol reduces the metabolism of thioridazine (Mellaril), increasing the concentration of thioridazine in the body and potentially causing abnormal heart beats.




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