Propranolol pharmacology

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    Propranolol pharmacology


    Due to its extensive first-pass hepatic effect by the peroral route, the drug shows a short plasma half-life (4). Propranolol is a lipid-soluble compound and its dosage form as tablet is completely absorbed by the peroral route. Propranolol, a prototype of this class of drugs based on competitive inhibition of catecholamine binding at beta-adrenoceptor sites, is conventionally prescribed by the peroral route, but intravenous administration is also available and usually prescribed for patients with acute syndromes (3). These drugs have proved to be effective and safe (1,2). Key words: propranolol, pharmacokinetics, pharmacodynamics, arterial hypertension, sublingual vs peroral administration For many years, beta-adrenergic antagonists were prescribed to patients with essential arterial hypertension, ischemic heart disease, cardiac arrhythmias and other cardiovascular diseases. Sublingual propranolol administration showed a better pharmacokinetic profile and this route of administration may be an alternative for intravenous or oral administration. Mouth paresthesia was the main adverse effect observed after sublingual administration. Prophylaxis 80 mg/day PO divided q6-8hr initially; may be increased by 20-40 mg/day every 3-4 weeks; not to exceed 160-240 mg/day divided q6-8hr Inderal LA: 80 mg/day PO; maintenance: 160-240 mg/day Withdraw therapy if satisfactory response not seen after 6 weeks Hemangeol: Indicated for treatment of proliferating hemangioma requiring systemic therapy Initiate treatment at aged 5 weeks to 5 months Starting dose: 0.6 mg/kg (0.15 m L/kg) PO BID for 1 week, THEN increase dose to 1.1 mg/kg (0.3 m L/kg) BID; after 2 more weeks, increase to maintenance dose of 1.7 mg/kg (0.4 m L/kg) BID PO: 0.5-1 mg/kg/day divided q6-8hr; may be increased every 3-7 days; usual range: 2-6 mg/kg/day; not to exceed 16 mg/kg/day or 60 mg/day IV: 0.01-0.1 mg/kg over 10 minutes; repeat q6-8hr PRN; not to exceed 1 mg for infants or 3 mg for children PO: 1 mg/kg/day divided q6hr; after 1 week, may be increased by 1 mg/kg/day to maximum of 10-15 mg/kg/day if patient refractory; allow 24 hours between dosing changes IV: 0.01-0.2 mg/kg over 10 minutes; not to exceed 5 mg Immediate-release: 40 mg PO q12hr initially, increased every 3-7 days; maintenance: 80-240 mg PO q8-12hr; not to exceed 640 mg/day Inderal LA: 80 mg/day PO initially; maintenance: 120-160 mg/day; not to exceed 640 mg/day Inno Pran XL: 80 mg/day PO initially; may be increased every 2-3 weeks until response achieved; maintenance: not to exceed 120 mg/day PO Consider lower initial dose PO: 10 mg q6-8hr; may be increased every 3-7 days IV: 1-3 mg at 1 mg/min initially; repeat q2-5min to total of 5 mg Once response or maximum dose achieved, do not give additional dose for at least 4 hours Aggravated congestive heart failure Bradycardia Hypotension Arthropathy Raynaud phenomenon Hyper/hypoglycemia Depression Fatigue Insomnia Paresthesia Psychotic disorder Pruritus Nausea Vomiting Hyperlipidemia Hyperkalemia Cramping Bronchospasm Dyspnea Pulmonary edema Respiratory distress Wheezing Allergic: Hypersensitivity reactions, including anaphylactic/anaphylactoid; agranulocytosis, erythematous rash, fever with sore throat Skin: Stevens-Johnson syndrome, toxic epidermal necrolysis, exfoliative dermatitis, erythema multiforme, urticaria Musculoskeletal: Myopathy, myotonia May exacerbate ischemic heart disease after abrupt withdrawal Hypersensitivity to catecholamines has been observed during withdrawal Exacerbation of angina and, in some cases, myocardial infarction occurrence after abrupt discontinuance When discontinuing long-term administration of beta blockers (particularly with ischemic heart disease), gradually reduce dose over 1-2 weeks and carefully monitor If angina markedly worsens or acute coronary insufficiency develops, reinstate beta-blocker administration promptly, at least temporarily (in addition to other measures appropriate for unstable angina) Warn patients against interruption or discontinuance of beta-blocker therapy without physician advice Because coronary artery disease is common and may be unrecognized, slowly discontinue beta-blocker therapy, even in patients treated only for hypertension Asthma, COPD Severe sinus bradycardia or 2°/3° heart block (except in patients with functioning artificial pacemaker) Cardiogenic shock Uncompensated congestive heart failure Hypersensitivity Overt heart failure Sick sinus syndrome without permanent pacemaker Do not use Inno Pran XL in pediatric patients Long-term beta blocker therapy should not be routinely discontinued before major surgery; however, the impaired ability of the heart to respond to reflex adrenergic stimuli may augment the risks of general anesthesia and surgical procedures Use caution in bronchospastic disease, cerebrovascular insufficiency, congestive heart failure, diabetes mellitus, hyperthyroidism/thyrotoxicosis, liver disease, renal impairment, peripheral vascular disease, myasthenic conditions Sudden discontinuance can exacerbate angina and lead to myocardial infarction Use in pheochromocytoma Increased risk of stroke after surgery Hypersensitivity reactions, including anaphylactic and anaphylactoid reactions, have been reported Cutaneous reactions, including Stevens-Johnson syndrome, toxic epidermal necrolysis, exfoliative dermatitis, erythema multiforme, and urticaria, have been reported Exacerbation of myopathy and myotonia has been reported Less effective than thiazide diuretics in black and geriatric patients May worsen bradycardia or hypotension; monitor HR and BP Avoid beta blockers without alpha1-adrenergic receptor blocking activity in patients with prinzmetal variant angina; unopposed alpha-1 adrenergic receptors may worsen anginal symptoms May induce or exacerbate psoriasis; cause and effect not established Prevents the response of endogenous catecholamines to correct hypoglycemia and masks the adrenergic warning signs of hypoglycemia, particularly tachycardia, palpitations, and sweating May cause or worsen bradycardia or hypotension Pregnancy category: C; intrauterine growth retardation, small placentas, and congenital abnormalities reported, but no adequate and well-controlled studies conducted Lactation: Use is controversial; an insignificant amount is excreted in breast milk Nonselective beta adrenergic receptor blocker; competitive beta1 and beta2 receptor inhibition results in decreases in heart rate, myocardial contractility, myocardial oxygen demand, and blood pressure Class 2 antidysrhythmic Bioavailability: 30-70% (food increases bioavailability) Onset: Hypertension, 2-3 wk; beta blockade, 2-10 min (IV) or 1-2 hr (PO) Duration: 6-12 hr (immediate release); 24-27 hr (extended release) Peak plasma time: 1-4 hr (immediate release); 6-14 hr (extended release) Solution: Most common solvents Additive: Dobutamine, verapamil Syringe: Inamrinone, milrinone Y-site: Alteplase, fenoldopam, gatifloxacin, heparin, hydrocortisone, sodium succinate, inamrinone, linezolid, meperidine, milrinone, morphine, potassium chloride, propofol, tacrolimus, tirofiban, vitamins B and C IV administration rate should not exceed 1 mg/min IV dose is much smaller than oral dose Give by direct injection into large vessel or into tubing of free-flowing compatible IV solution Continuous IV infusion generally is not recommended The above information is provided for general informational and educational purposes only. Individual plans may vary and formulary information changes. Contact the applicable plan provider for the most current information.

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    Propranolol pharmacology. Common Questions and Answers about Propranolol pharmacology. inderal. My cardiologist has put me on 120 mg of propranolol for the PVC's, and. Plasma propranolol levels in adults with observation in four children. Clinical Pharmacology and Therapeutics, 11 112-120. Links 29. Lennard MS, Jackson PR, Freestone S, Tucker GT, Ramsay LE & Woods HF 1984. The relationship between debrisoquine oxidation phenotype and the pharmacokinetics and pharmacodynamics of propranolol. Propranolol is the most widely studied non-selective, beta-1 and beta-2-blocker that can treat the increased heart rate and tremor. Pharmacology The Mechanism.

    Propranolol is a non selective beta receptor antagonist. You can use this directory to find the medicine stores in your city (or area) that provide home delivery services for propranolol and other medicines and health products. It have negative chronotropic and negative inotropic effects on heart. Home delivery services for propranolol may be free or they may cost you depending on the pharmacy and the minimum order requirements. It decreases oxygen consumption; cardiac work and aortic pressure It decreases nor adrenaline and renin releases. In sympathetic over activity, it prolongs systole by retarding conduction. It would be best to get this clarified while placing the order. It increases oxygen supply and exercise tolerance in angina patients. Please be aware that you should take propranolol only if a doctor has recommended or prescribed it. It decrease automaticity and abbreviates refractory period of myocardial fibers and decreases rate of depolarization in SA node, Purkinje fibers, and other ectoptic foci. Increases free fatty acid levels and increase LDL to HDL ratio 9. Some or all pharmacies who provide a home delivery service for medicines might insist on a prescription for propranolol before they complete the sale. Prolong effective refractory period of AV node and AV conduction is delayed. You can get this information while placing the order for propranolol with the pharmacy. At higher doses direct depressant membrane stabilizing action is exerted. Initially total peripheral resistance increases due to blockade of beta mediated vasodilatation and decrease in cardiac output; so little change in BP. Propranolol is a generic medicine name and there are several brands available for it. And other beta adrenergic receptor antagonists are widely used to treat cardiovascular disorders including hypertension, angina, arrhythmias, myocardial infarction, congestive heart failure, and hypertrophic subaortic stenosis. is indicated in canine and feline patients with ventricular and supraventricular tachyarrhythmias. It is commonly used with digoxin to slow the ventricular rate in patients with atrial fibrillation. It is effective for terminating and preventing the recurrence of supraventricular tachycardia. (Inderal, Wyeth-Ayerst Laboratory, Philadelphia) is a non-selective β-adrenergic antagonist that is used widely for the treatment of a diverse group of medical conditions including arrhythmia, angina, hypertension, and migraine. has effects on the sodium channels and at high concentrations on calcium channels as well. It seems that conduction tissues of neonates are more sensitive to the drug than those of older children and adults., the prototypic type II antiarrhythmic, has two types of effects on the heart: indirect effects as a consequence of blockade of β-adrenergic receptors and “membrane-stabilizing” effects similar to those of quinidine.

    Propranolol pharmacology

    Propranolol Ligand page IUPHAR/BPS Guide to PHARMACOLOGY, Pharmacokinetics and pharmacodynamics of propranolol in.

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  5. Pharmacology FAQ about this section. Metabolism liver extensively; CYP450 1A2, 2C19, 2D6 primary substrate. Excretion urine 1% unchanged; Half-life.

    • Propranolol hydrochloride Pharmacology - Epocrates Online.
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    The student should be able to explain or describe;. 1 The pharmacologic properties and toxicities of beta-adrenergic blockers as exemplified by propranolol and. Medscape - Hypertension-specific dosing for Inderal, Inderal LA propranolol, frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. Jul 31, 1975. THE β-adrenoceptor antagonist propranolol is an effective antihypertensive drug in man1 but it is not known how the fall in blood pressure is.

     
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