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Innopran XL (Propranolol Hydrochloride) - Drug Interactions, Contraindications, Overdosage, etc



Pharmacokinetic Drug-Drug Interactions

Impact of Propranolol on Other Drugs
Warfarin: Warfarin concentrations are increased when administered with propranolol. Monitor prothrombin time accordingly [see Clinical Pharmacology ( 12.7 )].

Propafenone: Co-administration of propranolol increases the plasma concentrations of propafenone. Monitor patients for symptoms of excessive exposure to propafenone including bradycardia and postural hypotension [see Clinical Pharmacology ( 12.7 )].

Impact of Other Drugs on Propranolol
CYP2D6-, CYP1A2- and CYP2C19 Inhibitors: CYP2D6 inhibitors (e.g. bupropion, fluoxetine, paroxetine, quinidine), CYP1A2 inhibitors (e.g., ciprofloxacin, enoxamine, fluvoxamine) and CYP2C19 inhibitors (e.g., fluconazole, fluvoxamine, ticlopidine) increase exposure to propranolol when co-administered with INNOPRAN XL. Monitor patients for bradycardia and hypotension [see Clinical Pharmacology ( 12.7 )]. 

CYP1A2 and CYP2C19 Inducers: CYP1A2 inducers (e.g., phenytoin, montelukast, smoking) and CYP2C19 inducers (e.g. rifampin) decrease the plasma levels of propranolol resulting in a loss of efficacy [see Clinical Pharmacology ( 12.7 )].

Cholestyramine and Colestipol: Co-administered cholestyramine or colestipol significantly reduces the plasma concentrations of co-administered propranolol which may result in loss of efficacy [see Clinical Pharmacology ( 12.7 )]. 

Pharmacodynamic Drug-Drug Interactions

Adrenergic Agonists: Beta-blockers may antagonize the antihypertensive effects of clonidine, and rebound hypertension may result if clonidine is withdrawn abruptly. If clonidine and a beta-blocker are co-administered, withdraw the beta-blocker several days before the withdrawal of clonidine

Alpha Blockers: Co-administration of beta-blockers with alpha blocker (e.g., prazosin) has been associated with prolongation of first dose hypotension and syncope.

Dobutamine: Propranolol may reduce sensitivity to dobutamine stress echocardiography in patients undergoing evaluation for myocardial ischemia.      

Antidepressants: The hypotensive effect of MAO inhibitors or tricyclic antidepressants may be exacerbated when administered with beta-blockers. Monitor patients for postural hypotension.

Nonsteroidal Anti-Inflammatory Drugs:  Nonsteroidal anti-inflammatory drugs (NSAIDS) may attenuate the antihypertensive effect of beta-adrenoreceptor blocking agents. Monitor blood pressure.


Most overdoses of propranolol are mild and respond to supportive care.

Propranolol is not significantly dialyzable.

Hypotension and bradycardia have been reported following propranolol overdose and should be treated appropriately. Glucagon can exert potent inotropic and chronotropic effects and may be particularly useful for the treatment of hypotension or depressed myocardial function after a propranolol overdose.

Glucagon should be administered as 50-150 mcg/kg intravenously followed by continuous drip of 1-5 mg/hour for positive chronotropic effect. Isoproterenol, dopamine or phosphodiesterase inhibitors may also be useful. Epinephrine, however, may provoke uncontrolled hypertension. Bradycardia can be treated with atropine or isoproterenol. Serious bradycardia may require temporary cardiac pacing.

Monitor the electrocardiogram, pulse, blood pressure, neurobehavioral status and intake and output balance. Isoproterenol and aminophylline may be used for bronchospasm.


INNOPRAN XL is contraindicated in patients with:

  • Cardiogenic shock or decompensated heart failure
  • Sinus bradycardia, sick sinus syndrome, and greater than first-degree block unless a permanent pacemaker is in place
  • Bronchial asthma
  • Known hypersensitivity (e.g., anaphylactic reaction) to propranolol hydrochloride or any of the components of INNOPRAN XL.

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