Dosage & administration
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Inderal LA prescribing information
INDICATIONS AND USAGE
Hypertension
Inderal LA is indicated in the management of hypertension. It may be used alone or used in combination with other antihypertensive agents, particularly a thiazide diuretic. Inderal LA is not indicated in the management of hypertensive emergencies.
Angina Pectoris Due to Coronary Atherosclerosis
Inderal LA is indicated to decrease angina frequency and increase exercise tolerance in patients with angina pectoris.
Migraine
Inderal LA is indicated for the prophylaxis of common migraine headache. The efficacy of propranolol in the treatment of a migraine attack that has started has not been established, and propranolol is not indicated for such use.
Hypertrophic Subaortic Stenosis
Inderal LA improves NYHA functional class in symptomatic patients with hypertrophic subaortic stenosis.
DOSAGE AND ADMINISTRATION
General
Inderal LA provides propranolol hydrochloride in a sustained-release capsule for administration once daily. If patients are switched from Inderal Tablets to Inderal LA Capsules, care should be taken to assure that the desired therapeutic effect is maintained. Inderal LA should not be considered a simple mg-for-mg substitute for Inderal. Inderal LA has different kinetics and produces lower blood levels. Retitration may be necessary, especially to maintain effectiveness at the end of the 24-hour dosing interval.
Hypertension
The usual initial dosage is 80 mg Inderal LA once daily, whether used alone or added to a diuretic. The dosage may be increased to 120 mg once daily or higher until adequate blood pressure control is achieved. The usual maintenance dosage is 120 to 160 mg once daily. In some instances a dosage of 640 mg may be required. The time needed for full hypertensive response to a given dosage is variable and may range from a few days to several weeks.
Angina Pectoris
Starting with 80 mg Inderal LA once daily, dosage should be gradually increased at three- to seven-day intervals until optimal response is obtained. Although individual patients may respond at any dosage level, the average optimal dosage appears to be 160 mg once daily. In angina pectoris, the value and safety of dosage exceeding 320 mg per day have not been established.
If treatment is to be discontinued, reduce dosage gradually over a period of a few weeks (see " WARNINGS " ).
Migraine
The initial oral dose is 80 mg Inderal LA once daily. The usual effective dose range is 160 to 240 mg once daily. The dosage may be increased gradually to achieve optimal migraine prophylaxis. If a satisfactory response is not obtained within four to six weeks after reaching the maximal dose, Inderal LA therapy should be discontinued. It may be advisable to withdraw the drug gradually over a period of several weeks depending on the patient's age, comorbidity, and dose of Inderal LA.
Hypertrophic Subaortic Stenosis
The usual dosage is 80 to 160 mg Inderal LA once daily.
CONTRAINDICATIONS
Propranolol is contraindicated in 1) cardiogenic shock; 2) sinus bradycardia and greater than first-degree block; 3) bronchial asthma; and 4) in patients with known hypersensitivity to propranolol hydrochloride.
ADVERSE REACTIONS
The following adverse events were observed and have been reported in patients using propranolol.
Cardiovascular: Bradycardia; congestive heart failure; intensification of AV block; hypotension; paresthesia of hands; thrombocytopenic purpura; arterial insufficiency, usually of the Raynaud type.
Central Nervous System: Light-headedness; mental depression manifested by insomnia, lassitude, weakness, fatigue; catatonia; visual disturbances; hallucinations; vivid dreams; an acute reversible syndrome characterized by disorientation for time and place, short-term memory loss, emotional lability, slightly clouded sensorium, and decreased performance on neuropsychometrics. For immediate release formulations, fatigue, lethargy, and vivid dreams appear dose related.
Gastrointestinal: Nausea, vomiting, epigastric distress, abdominal cramping, diarrhea, constipation, mesenteric arterial thrombosis, ischemic colitis.
Allergic: Hypersensitivity reactions, including anaphylactic/anaphylactoid reactions; pharyngitis and agranulocytosis; erythematous rash; fever combined with aching and sore throat; laryngospasm; respiratory distress.
Respiratory: Bronchospasm.
Hematologic: Agranulocytosis, nonthrombocytopenic purpura, and thrombocytopenic purpura.
Autoimmune: Systemic lupus erythematosus (SLE).
Skin and Mucous Membranes: Stevens-Johnson Syndrome, toxic epidermal necrolysis, dry eyes, exfoliative dermatitis, erythema multiforme, urticaria, alopecia, SLE-like reactions, and psoriasisiform rashes. Oculomucocutaneous syndrome involving the skin, serous membranes, and conjunctivae reported for a beta-blocker (practolol) have not been associated with propranolol.
Genitourinary: Male impotence; Peyronie's disease.
Drug Interactions
Caution should be exercised when Inderal LA is administered with drugs that have an affect on CYP2D6, 1A2, or 2C19 metabolic pathways. Co-administration of such drugs with propranolol may lead to clinically relevant drug interactions and changes on its efficacy and/or toxicity (see Drug Interactions in PHARMACOKINETICS AND DRUG METABOLISM ).
Alcohol when used concomitantly with propranolol, may increase plasma levels of propranolol.
Cardiovascular Drugs
Antiarrhythmics
Propafenone has negative inotropic and beta-blocking properties that can be additive to those of propranolol.
Quinidine increases the concentration of propranolol and produces greater degrees of clinical beta-blockade and may cause postural hypotension.
Amiodarone is an antiarrhythmic agent with negative chronotropic properties that may be additive to those seen with β-blockers such as propranolol.
The clearance of lidocaine is reduced with administration of propranolol. Lidocaine toxicity has been reported following co-administration with propranolol.
Caution should be exercised when administering Inderal LA with drugs that slow A-V nodal conduction, e.g., lidocaine and calcium channel blockers.
Digitalis Glycosides
Both digitalis glycosides and beta-blockers slow atrioventricular conduction and decrease heart rate. Concomitant use can increase the risk of bradycardia.
Calcium Channel Blockers
Caution should be exercised when patients receiving a beta-blocker are administered a calcium-channel-blocking drug with negative inotropic and/or chronotropic effects. Both agents may depress myocardial contractility or atrioventricular conduction.
There have been reports of significant bradycardia, heart failure, and cardiovascular collapse with concurrent use of verapamil and beta-blockers.
Co-administration of propranolol and diltiazem in patients with cardiac disease has been associated with bradycardia, hypotension, high degree heart block, and heart failure.
ACE Inhibitors
When combined with beta-blockers, ACE inhibitors can cause hypotension, particularly in the setting of acute myocardial infarction.
The antihypertensive effects of clonidine may be antagonized by beta-blockers. Inderal LA should be administered cautiously to patients withdrawing from clonidine.
Alpha Blockers
Prazosin has been associated with prolongation of first dose hypotension in the presence of beta-blockers.
Postural hypotension has been reported in patients taking both beta-blockers and terazosin or doxazosin.
Reserpine
Patients receiving catecholamine-depleting drugs, such as reserpine should be closely observed for excessive reduction of resting sympathetic nervous activity, which may result in hypotension, marked bradycardia, vertigo, syncopal attacks, or orthostatic hypotension.
Inotropic Agents
Patients on long-term therapy with propranolol may experience uncontrolled hypertension if administered epinephrine as a consequence of unopposed alpha-receptor stimulation. Epinephrine is therefore not indicated in the treatment of propranolol overdose (see OVERDOSAGE ).
Isoproterenol and Dobutamine
Propranolol is a competitive inhibitor of beta-receptor agonists, and its effects can be reversed by administration of such agents, e.g., dobutamine or isoproterenol. Also, propranolol may reduce sensitivity to dobutamine stress echocardiography in patients undergoing evaluation for myocardial ischemia.
Non-Cardiovascular Drugs
Nonsteroidal Anti-Inflammatory Drugs
Nonsteroidal anti-inflammatory drugs (NSAIDs) have been reported to blunt the antihypertensive effect of beta-adrenoreceptor blocking agents.
Administration of indomethacin with propranolol may reduce the efficacy of propranolol in reducing blood pressure and heart rate.
Antidepressants
The hypotensive effects of MAO inhibitors or tricyclic antidepressants may be exacerbated when administered with beta-blockers by interfering with the beta-blocking activity of propranolol.
Anesthetic Agents
Methoxyflurane and trichloroethylene may depress myocardial contractility when administered with propranolol.
Warfarin
Propranolol when administered with warfarin increases the concentration of warfarin. Prothrombin time, therefore, should be monitored.
Neuroleptic Drugs
Hypotension and cardiac arrest have been reported with the concomitant use of propranolol and haloperidol.
Thyroxine
Thyroxine may result in a lower than expected T 3 concentration when used concomitantly with propranolol.
DESCRIPTION
Inderal ® LA (propranolol hydrochloride) is a synthetic beta-adrenergic receptor-blocking agent chemically described as 2-Propanol, 1-[(1-methylethyl)amino]-3-(1-naphthalenyloxy)-, hydrochloride,(±)-. Its molecular and structural formulae are:
C 16 H 21 NO 2 · HCl
Propranolol hydrochloride USP is a stable, white, crystalline solid which is readily soluble in water and ethanol. Its molecular weight is 295.80.
Inderal LA is formulated to provide a sustained release of propranolol hydrochloride USP. Inderal LA is available as 60 mg, 80 mg, 120 mg, and 160 mg capsules for oral administration.
- Each Inderal LA 60 mg capsule contains 60 mg propranolol hydrochloride USP (equivalent to 52.60 mg of propranolol).
- Each Inderal LA 80 mg capsule contains 80 mg propranolol hydrochloride USP (equivalent to 70.14 mg of propranolol).
- Each Inderal LA 120 mg capsule contains 120 mg propranolol hydrochloride USP (equivalent to 105.21 mg of propranolol).
- Each Inderal LA 160 mg capsule contains 160 mg propranolol hydrochloride USP (equivalent to 140.28 mg of propranolol).
The inactive ingredients contained in Inderal LA capsules are: diethyl phthalate, hypromellose phthalate, ethylcellulose, povidone, polyethylene glycol, corn starch, sucrose, hypromellose, gelatin capsules and titanium dioxide. In addition Inderal LA 60 mg capsules contain D&C Red No. 28 and FD&C Blue No. 1; Inderal LA 80 mg and 120 mg capsules contain FD&C Red No. 3 and FD&C Blue No. 1; Inderal LA 160 mg capsules contain FD&C Blue No. 1.
FDA approved dissolution specifications differ from USP.
CLINICAL PHARMACOLOGY
General
Propranolol is a nonselective, beta-adrenergic receptor-blocking agent possessing no other autonomic nervous system activity. It specifically competes with beta-adrenergic receptor-stimulating agents for available receptor sites. When access to beta-receptor sites is blocked by propranolol, the chronotropic, inotropic, and vasodilator responses to beta-adrenergic stimulation are decreased proportionately. At dosages greater than required for beta blockade, propranolol also exerts a quinidine-like or anesthetic-like membrane action, which affects the cardiac action potential. The significance of the membrane action in the treatment of arrhythmias is uncertain.
Inderal LA should not be considered a simple mg-for-mg substitute for conventional propranolol and the blood levels achieved do not match (are lower than) those of two to four times daily dosing with the same dose (see DOSAGE AND ADMINISTRATION ). When changing to Inderal LA from conventional propranolol, a possible need for retitration upwards should be considered, especially to maintain effectiveness at the end of the dosing interval. In most clinical settings, however, such as hypertension or angina where there is little correlation between plasma levels and clinical effect, Inderal LA has been therapeutically equivalent to the same mg dose of conventional Inderal as assessed by 24-hour effects on blood pressure and on 24-hour exercise responses of heart rate, systolic pressure, and rate pressure product.
Mechanism of Action
The mechanism of the antihypertensive effect of propranolol has not been established. Among the factors that may be involved in contributing to the antihypertensive action include: (1) decreased cardiac output, (2) inhibition of renin release by the kidneys, and (3) diminution of tonic sympathetic nerve outflow from vasomotor centers in the brain. Although total peripheral resistance may increase initially, it readjusts to or below the pretreatment level with chronic use of propranolol. Effects of propranolol on plasma volume appear to be minor and somewhat variable.
In angina pectoris, propranolol generally reduces the oxygen requirement of the heart at any given level of effort by blocking the catecholamine-induced increases in the heart rate, systolic blood pressure, and the velocity and extent of myocardial contraction. Propranolol may increase oxygen requirements by increasing left ventricular fiber length, end diastolic pressure, and systolic ejection period. The net physiologic effect of beta-adrenergic blockade is usually advantageous and is manifested during exercise by delayed onset of pain and increased work capacity.
Propranolol exerts its antiarrhythmic effects in concentrations associated with beta-adrenergic blockade, and this appears to be its principal antiarrhythmic mechanism of action. In dosages greater than required for beta blockade, propranolol also exerts a quinidine-like or anesthetic-like membrane action which affects the cardiac action potential. The significance of the membrane action in the treatment of arrhythmias is uncertain.
The mechanism of the anti-migraine effect of propranolol has not been established. Beta-adrenergic receptors have been demonstrated in the pial vessels of the brain.
HOW SUPPLIED
Inderal ® LA (propranolol hydrochloride) Long-Acting Capsules
Each white/light-blue capsule, imprinted with three rings and reverse imprinted ‘INDERAL LA 60’, contains 60 mg of propranolol hydrochloride USP (equivalent to 52.60 mg of propranolol) and are available in: Bottles of 30 NDC 62559-520-30 Bottles of 100 NDC 62559-520-01
Each light-blue capsule, imprinted with three rings and reverse imprinted ‘INDERAL LA 80’, contains 80 mg of propranolol hydrochloride USP (equivalent to 70.14 mg of propranolol) and are available in: Bottles of 30 NDC 62559-521-30 Bottles of 100 NDC 62559-521-01
Each light-blue/dark-blue capsule, imprinted with three rings and reverse imprinted ‘INDERAL LA 120’, contains 120 mg of propranolol hydrochloride USP (equivalent to 105.21 mg of propranolol) and are available in: Bottles of 30 NDC 62559-522-30 Bottles of 100 NDC 62559-522-01
Each dark-blue capsule, imprinted with three rings and reverse imprinted ‘INDERAL LA 160’, contains 160 mg of propranolol hydrochloride USP (equivalent to 140.28 mg of propranolol) and are available in: Bottles of 30 NDC 62559-523-30 Bottles of 100 NDC 62559-523-01
Store at 20° to 25°C (68° to 77°F); excursions permitted to 15° to 30°C (59° to 86°F). [See USP Controlled Room Temperature]
Protect from light, moisture, freezing, and excessive heat.
Dispense in a tight, light-resistant container as defined in the USP.
For medical inquires, contact ANI Pharmaceuticals, Inc. at 1-800-308-6755.
Distributed by: ANI Pharmaceuticals, Inc. Baudette, MN 56623 
10611 Rev 06/24
