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INDERAL (PROPRANOLOL HYDROCHLORIDE) TABLETS: DRUG INTERACTIONS
Interactions with Substrates, Inhibitors or Inducers of Cytochrome P-450 Enzymes Because propranolol's metabolism involves multiple pathways in the cytochrome P-450 system (CYP2D6, 1A2, 2C19), co-administration with drugs that are metabolized by, or effect the activity (induction or inhibition) of one or more of these pathways may lead to clinically relevant drug interactions.
Substrates or Inhibitors of CYP2D6
Blood levels and/or toxicity of Inderal (Propranolol) may be increased by co-administration with substrates or inhibitors of CYP2D6, such as cimetidine, amiodarone, delavudin, paroxetine, fluoxetine, quinidine, and ritonavir. No interactions were observed with either ranitidine or lansoprazole.
Substrates or Inhibitors of CYP1A2
Blood levels and/or toxicity of Inderal (Propranolol) tablets may be increased by co-administration with substrates or inhibitors of CYP1A2, such as cimetidine, imipramine, ciprofloxacin, isoniazid, fluvoxamine, ritonavir, zileuton, theophylline, zolmitriptan, and rizatriptan.
Substrates or Inhibitors of CYP2C19
Blood levels and/or toxicity of Inderal (Propranolol HCl) may be increased by co-administration with substrates or inhibitors of CYP2C19, such as cimetidine, fluconazole, fluoxetine, tenioposide, fluvoxamine, and tolbutamide. No interaction was observed with omeprazole.
Inducers of Hepatic Drug Metabolism
Blood levels of Inderal (Propranolol HCl) tablets may be decreased by co-administration with inducers such as ethanol, phenytoin, rifampin, and phenobarbital. Cigarette smoking also induces hepatic metabolism and has been shown to increase up to 77% the clearance of propranolol, resulting in decreased plasma concentrations.
The AUC of propafenone is increased by more than 200% by co-administration of Inderal (Propranolol Hydrochloride).
The metabolism of propranolol is reduced by co-administration of quinidine, leading to a two-three fold increased blood concentration and greater degrees of clinical beta-blockade.
The metabolism of lidocaine is inhibited by co-administration of Inderal (Propranolol Hydrochloride) tablets, resulting in a 25% increase in lidocaine concentrations.
Calcium Channel Blockers
The mean Cmax and AUC of propranolol are increased, respectively, by 50% and 30% by co-administration of nisoldipine and by 80% and 47%, by co-administration of nicardipine.
The mean Cmax and AUC of nifedipine are increased by 64% and 79%, respectively, by co-administration of Propranolol (Inderal).
Propranolol does not affect the pharmacokinetics of verapamil and norverapamil. Verapamil does not affect the pharmacokinetics of Propranolol (Inderal) tablets.
Administration of zolmitriptan or rizatriptan with propranolol resulted in increased concentrations of zolmitriptan (AUC increased by 56% and Cmax by 37%) or rizatriptan (the AUC and Cmax were increased by 67% and 75%, respectively).
Co-administration of theophylline with Propranolol HCl (Inderal) decreases theophylline oral clearance by 30% to 52%.
Propranolol HCl (Inderal) tablets can inhibit the metabolism of diazepam, resulting in increased concentrations of diazepam and its metabolites. Diazepam does not alter the pharmacokinetics of propranolol.
The pharmacokinetics of triazolam, oxazepam, lorazepam, and alprazolam are not affected by co-administration of propranolol.
Co-administration of long-acting propranolol at doses greater than or equal to 160 mg/day resulted in increased thioridazine plasma concentrations ranging from 55% to 369% and increased thioridazine metabolite (mesoridazine) concentrations ranging from 33% to 209%.
Co-administration of chlorpromazine with Propranolol Hydrochloride (Inderal) resulted in a 70% increase in propranolol plasma level.
Co-administration of propranolol with cimetidine, a non-specific CYP450 inhibitor, increased propranolol AUC and Cmax by 46% and 35%, respectively. Co-administration with aluminum hydroxide gel (1200 mg) may result in a decrease in propranolol concentrations.
Co-administration of metoclopramide with the long-acting Propranolol Hydrochloride (Inderal) tablets did not have a significant effect on propranolol's pharmacokinetics.
Lipid Lowering Drugs
Co-administration of cholestyramine or colestipol with propranolol resulted in up to 50% decrease in propranolol concentrations.
Co-administration of Inderal (Propranolol) with lovastatin or pravastatin, decreased 18% to 23% the AUC of both, but did not alter their pharmacodynamics. This drug did not have an effect on the pharmacokinetics of fluvastatin.
Concomitant administration of propranolol and warfarin has been shown to increase warfarin bioavailability and increase prothrombin time.
Concomitant use of alcohol may increase plasma levels of Inderal (Propranolol HCl).
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