Metoprolol Pharmacology


About Metoprolol
A selective ?1 blocker, Anti-hypertensive.
Mechanism of Action of Metoprolol
Metoprolol is a cardio selective beta-1 adrenergic antagonist.
It have negative chronotropic and negative inotropic effects on heart. It decreases oxygen consumption; cardiac work and aortic pressure It decreases nor adrenaline and renin releases. It decreases central sympathetic out flow. In sympathetic over activity, it prolongs systole by retarding conduction. It increases oxygen supply and exercise tolerance in angina patients. The drug decreases BP in hypertensive individuals.
Antimigraine action: Metoprolol is useful in migraine due to its beta blockade action. Through beta blockade action it inhibits vasodilation and relieves migraine.
Pharmacokinets of Metoprolol
Absorption: well absorbed orally, bioavailabity is increased by administering along with food. Distribution: Widely distributed. Metabolism: Metabolized in liver by hydroxylation. Excretion: Excreted through urine.
Onset of Action for Metoprolol
Duration of Action for Metoprolol
Up to 1 to12 hours
Half Life of Metoprolol
Side Effects of Metoprolol
1.Heart failure
3.Gastrointestinal problems
6.Sinus bradycardia
Contra-indications of Metoprolol
1.Hypersensitivity to the drug
2.Second or third degree heart block
3.Congestive heart failure
4.Cardiogenic shock
6.Bronchial asthma
7.Diabetes mellitus
Special Precautions while taking Metoprolol
1.Congestive heart failure
2.Hepatic impairment
3.The drug should be gradually withdraw with caution
4.Respiratory disorders
Pregnancy Related Information
Old Age Related Information
Use with caution
Breast Feeding Related Information
Children Related Information
Indications for Metoprolol
5.Prophylaxis of myocardial infarction
Interactions for Metoprolol
Thioamines: Increased efficacy of metoprolol.
Thyroid hormones: Decreased efficacy of metoprolol.
Benzodiazepines: Increased efficacy of benzodiazepines.
Clonidine: Abrupt withdrawal of clonidine may lead to hypertensive crisis.
Ergot alkaloids: Peripheral ischaemia, possible peripheral gangrene.
Lidocaine: Increased lidocaine level may occur leading to toxicity.
Prazosin: Increased postural hypotension produced by parzosin.
Sulphonylureas: Hypoglycaemic effects may be attenuated.
Typical Dosage for Metoprolol
Adult: 50 to 450mg/day
Hypertension: Starts with 50mg to 100mg/day once daily or in divided doses and gradually increases up to 450mg/day based on patient`s response
Oral: 100mg to 150mg/day in 2 to 3 divided doses
I.V.: Dose range: 10 to 15mg. Starts with 5mg infused within 5minutes. Then repeat the therapy with the same dose at every 5minutes interval based on patient`s response
Maximum dose: 20mg
Angina: 50mg twice daily, gradually increases based on patient`s response at one week intervals
Maximum dose: 0.4gm/day
Migraine: 0.1 to 0.2gm/day in divided doses in 12th hourly to 6th hourly.
Prophylaxis of myocardial infarction: 0.1 to 0.2gm/day in divided doses
Myocardial infarction: 15mg in 3divided doses at 2minutes interval as I.V.bolus administration. Then 200mg orally in four divided doses for 2days.

Schedule of Metoprolol
Storage Requirements for Metoprolol
Store at controlled room temperature between 20 to 25 degree C in a well closed container

Effects of Missed Dosage of Metoprolol
Take the missed dose as soon as noticed and if it is the time for next dose then skip the missed dose. Continue the regular schedule. Do not double the dose.
Effects of Overdose of Metoprolol
Treatment is supportive and symptomatic. After ingestion empty the stomach by induced emesis or gastric lavage. Administer activated charcoal. Treat Bradycardia with atropine 0.5 to 1mg.If required administer isoproterinol with caution. Treat hypotension with glucagons and vasopressors like epinephrine. Treat cardiac failure with diuretics and cardiac glycosides. Treat bronchospasm with isoproterinol and aminophylline

Home Delivery for Metoprolol in Your City

Medicine India is just a publishing medium for medicine related information and does not provide services or sales of medicines including metoprolol.

However, we do publish a comprehensive directory of Pharmacies, Chemists and Druggists in cities all over India. You can use this directory to find the medicine stores in your city (or area) that provide home delivery services for metoprolol and other medicines and health products. Home delivery services for metoprolol may be free or they may cost you depending on the pharmacy and the minimum order requirements. It would be best to get this clarified while placing the order.

Please be aware that you should take metoprolol only if a doctor has recommended or prescribed it. Some or all pharmacies who provide a home delivery service for medicines might insist on a prescription for metoprolol before they complete the sale. You can get this information while placing the order for metoprolol with the pharmacy.

Metoprolol is a generic medicine name and there are several brands available for it. Some of the brands for metoprolol might be better known than metoprolol itself. If the pharmacy that's willing to deliver medicines to your home doesn't have metoprolol in stock, you can ask for one of the branded alternatives for metoprolol.