Tenormin Medication Information:

Price Break On Tenormin
Generic is available for less money: Generic Atenolol

Tenormin medication comes in several different strengths; click on the strength you need to view prices from pharmacies competing to earn your business.

Tenormin 25 mg
Tenormin 50 mg
Tenormin 100 mg

Tenormin General Information

Tenormin is the brand name for the drug atenolol, which is a selective beta-1 adrenergic antgonist. Tenormin is used to treat cardiovascular diseases, specifically hypertension.

How does Tenormin work & What does it do?

Tenormin is a drug in the class known as beta blockers, which help to prevent "fight or flight" activation of certain bodily functions normally caused by epinephrine. By selectively blocking only certain types of beta adrenergic receptors, Tenormin can reduce hypertension without many of the side effects which occurred with older beta blocker drugs. In essence, by blocking the effects of epinephrine, Tenormin slows down the heart, and reduces its need to pump rapidly, thus reducing hypertension. Tenormin may be used to help treat other heart ailments, such as angina, coronary heart disease, heart arrhythmia, and heart complications which may arise after a heart attack. Since Tenormin is excreted by the kidneys, patients with liver disease or permanent liver damage may still safely take this medication, which makes it a useful pharmacological option for treating certain patients. Tenormin may be administered on its own, or in conjunction with other anti-hypertensive medications, such as certain types of diuretics.

When/How is Tenormin taken/used/applied?

Tenormin is taken orally as a tablet for most conditions, but the dosage regimen may vary depending on what types of symptoms are being treated. For hypertension, a 25 to 50 mg per day dosage is usually sufficient, given all at once. For angina pectoralis and arrhythmia, a 50 mg per day dosage, given once a day. These dosages may be increased to 100 to 200 mg a day, but in these cases, the dosages are usually split into two equal doses taken separately throughout the day. In the case of acute myocardial infarction (heart attack), 5 mg Tenormin is administered intravenously, with another 5 mg IV given ten minutes later. These initial IV doses are followed up with oral administration of 50 mg Tenormin ten minutes after the last IV dose. Treatment continues with another 50 mg dose of Tenormin for the patient twelve hours later, and then therapy proceeds with daily doses of Tenormin, similar to using this medication for treatment of hypertension, angina pectoralis, or arrhythmia.

Side Effects

Since Tenormin does not generally get inside of the central nervous system like other beta blockers, fewer CNS side effects are seen than with similar medications such as propranolol. One of the main side effect risks may be that it can promote the development of type II diabetes. Other side effects have also been observed, but most patients describe them as being mild and not lasting very long. Both hypertensive and myocardial infarction patients treated with Tenormin have reported indigestion, constipation, dry mouth, fatigue, depression, hair loss, dizziness, nausea, and difficulties with sexual function. Patients being treated with Tenormin for acute myocardial infarction noted an increase in bradycardia and hypotension (which would occur with any beta blocker treatment), and these side effects were successfully treated by administration of atropine or reducing the dosage of Tenormin. Rarely, skin rashes and dry, reddened eyes have been reported by patients taking Tenormin, which required immediate discontinuation of Tenormin therapy if other reasons for these phenomena could not be found. The most rare and severe side effects which would require immediate medical attention were hypotension, hallucinations, unsteady gait when walking, and difficulty hearing or seeing.

Other Brand Names for Tenormin:

Tenormin (atenolol) is currently only available as a brand name in the United States, so generic versions or alternate brand names are non-existent.

Safety Information:

Tenormin should not be used with patients who have a sensitivity to atenolol or beta-blocker type drugs. Tenormin should be avoided in patients with sinus bradycardia (a slow, but regular heart beat), cardiogenic shock, overt cardiac failure, and patients with heart blockage greater than the first degree. Caution should be used when administering Tenormin with other beta blockers or calcium channel blockers, as bradycardia or heart blockage may result. Continued usage of Tenormin in patients with coronary artery disease should be cautiously monitored by a medical professional, since repeated depression of the myocardium with Tenormin can lead to cardiac failure. Patients taking Tenormin for coronary artery disease, angina pectoralis, or heart arrhythmias should be be advised against sudden cessation of this medication, since angina and myocardial infarction may result. Instead, gradual reduction of the medication under medical supervision is necessary. Patients taking drugs such as clonidine, MAO inhibitors, allergy or cold medications, heart medications, stimulant medications, or digoxin should consult their doctor before beginning Tenormin treatment, since potentially dangerous interactions could result.


  • Tablet - 25 mg
  • Tablet - 50 mg
  • Tablet - 100 mg

Visual Description:

  • Tablet - 25 mg - Round, white tablet with a "T" on one side and "107" on the other side.
  • Tablet - 50 mg - Round, white, scored tablet with "Tenormin" on one side and "105" on the scored side.
  • Tablet - 100 mg - Round, white tablet with "Tenormin" on one side and "101" on the other side.


Technical Information