TENORMIN TABLET 50mg

Atenolol

Source of information: Drugbank (External Link). Last updated on: 3rd July 18
*Trade Name used in the content below may not be the same as the HSA-registered product.

Active Ingredient / Synonyms

1-p-Carbamoylmethylphenoxy-3-isopropylamino-2-propanol | 2-(p-(2-Hydroxy-3-(isopropylamino)propoxy)phenyl)acetamide | 4-(2-Hydroxy-3-((1-methylethyl)amino)propoxy)benzeneacetamide | Atenololum | Atenolol |

Description

A cardioselective beta-adrenergic blocker possessing properties and potency similar to propranolol, but without a negative inotropic effect.

Indication

For the management of hypertention and long-term management of patients with angina pectoris

Mechanism of Action

Like metoprolol, atenolol competes with sympathomimetic neurotransmitters such as catecholamines for binding at beta(1)-adrenergic receptors in the heart and vascular smooth muscle, inhibiting sympathetic stimulation. This results in a reduction in resting heart rate, cardiac output, systolic and diastolic blood pressure, and reflex orthostatic hypotension. Higher doses of atenolol also competitively block beta(2)-adrenergic responses in the bronchial and vascular smooth muscles.

Pharmacodynamics

Atenolol, a competitive beta(1)-selective adrenergic antagonist, has the lowest lipid solubility of this drug class. Although it is similar to metoprolol, atenolol differs from pindolol and propranolol in that it does not have intrinsic sympathomimetic properties or membrane-stabilizing activity. Atenolol is used alone or with chlorthalidone in the management of hypertension and edema.

Pharmacokinetics

Absorption:

Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces.

Distribution:

Not Available

Metabolism:

Hepatic (minimal)

Elimination:

Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces. Unlike propranolol or metoprolol, but like nadolol, atenolol undergoes little or no metabolism by the liver, and the absorbed portion is eliminated primarily by renal excretion.

Half-life

6-7 hours

Clearance

Not Available

Toxicity

LD50=2000-3000 mg/kg(orally in mice). Symptoms of an atenolol overdose include a slow heart beat, shortness of breath, fainting, dizziness, weakness, confusion, nausea, and vomiting.

References

  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank

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Approval Information

TENORMIN TABLET 50mg was registered with Health Science Authority of Singapore by ASTRAZENECA SINGAPORE PTE LTD. It is marketed with the registration number of SIN00348P with effective from 1988-04-22.

This product contains 50mg of Atenolol in the form of TABLET, FILM-COATED.

The medicine was manufactured by ASTRAZENECA UK LTD in UNITED KINGDOM

It is a Presciption Only Medicine which can only be obtained from a doctor or a dentist, or from a pharmacist with a prescription from a Singapore-registered doctor or dentist.

Anatomical Therapeutic Chemical (ATC) Classification

ATC Code: C07AB03

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