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Atenolol (Tenormin) - Purchase Online


Brand name: Tenormin
Generic name: Atenolol
Systematic (IUPAC) name: 2-[4-[2-hydroxy-3-(1-methylethylamino)propoxy]phenyl]ethanamide OR 2-(4-(2-hydroxy-3-(isopropylamino)propoxy)phenyl)acetamide
Chemical formula: C14H22N2O3

Atenolol (Tenormin) is a drug belonging to betablockers, a class of drugs used primarily in cardiovascular diseases. The chemical works by slowing down the heart and reducing its workload.

Atenolol is used to treat hypertension, coronary heart disease, arrhythmias, angina (chest pain) and to treat and reduce the risk of heart complications following myocardial infarction (heart attack).

Provisional data suggests that antihypertensive therapy with atenolol provides weaker protective action against cardiovascular complications (e.g. myocardial infarction and stroke) compared to other antihypertensive drugs. In particular, diuretics are superior. However, controlled studies are lacking.


Atenolol should be avoided or used with caution with patients having:

  • bradycardia (pulse less than 50 bpm)
  • cardiogenic shock
  • asthma (may cause broncho-constriction), although unlikely as atenolol is cardioselective
  • symptomatic hypotension (blood pressure of less than 100/60 mm Hg with dizziness, vertigo etc.)
  • angina of the Prinzmetal type (vasospastic angina)
  • metabolic acidosis (a severe condition with a more acid blood than normal)
  • severe disorders in peripheral arterial circulation
  • arrhythmia
  • acutely decompensated congestive heart failure (symptoms may be fluid retention with peripheral edema and/or abdominal fluid retention (ascites), and/or lung edema)
  • hypersensitivity and/or allergy to atenolol
  • phaeochromocytoma (a rare type of tumor above the kidneys)


  • The drug crosses the placenta barrier freely. In the milk of breastfeeding mothers, approximately 3 times the plasma concentrations are measured. Atenolol may retard fetal growth and possibly causes other abnormalities. If you are pregnant or plan to become pregnant, or feeding a baby, ask your doctor.

    Side effects include:

  • indigestion, constipation
  • dry mouth
  • fatigue or dizziness
  • hair loss
  • problems with sexual function
  • runny/blocked nose
  • depression and confusion
  • difficulty sleeping, nightmares
  • weakness or lack of energy

  • These side effects may or may not be experienced, but if they are, you should notify your doctor.

    More serious side effects can include:

  • hallucinations
  • low blood pressure (hypotension)
  • skin reactions, eg. rash, hives, flaking of skin, worsening of psoriasis
  • sensation of 'pins and needles' hands or feet
  • irritated eyes, visual disturbances
  • difficulty hearing
  • difficulty speaking
  • unsteadiness when walking

  • These side effects can be serious and may indicate urgent medical attention is necessary. All of these side effects are very rare, and others not mentioned in the above list can occur in some people.

    Dosage can vary from as little as 25mg to 200mg a day. In cases of doses over 100mg, the dosage is usually divided and taken twice daily. Action of the usual oral dose of 25 to 100mg lasts over a period of 24 hours.

    Symptoms of overdose include bradycardia, severe hypotension with shock, acute heart failure, hypoglycemia and bronchospastic reactions. Treatment is largely symptomatic. Hospitalization and intensive monitoring is indicated. In early cases emesis can be induced. Activated charcoal is useful to absorb the drug.


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  • Order Tenormin (Atenolol) 50mg