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Home > Drug Category > Blood Pressure Medications (Calcium & Beta Blockers) > Tenormin and Equivalent

Tenormin Information

Tenormin (atenolol) is a beta-adrenergic receptor blocker used primarily to treat hypertension (high blood pressure) and angina pectoris (chest pain). It works by blocking the effects of adrenaline (epinephrine) on the heart and blood vessels. This action results in a slower heart rate, reduced blood pressure, and decreased strain on the heart. In hypertension, lowering blood pressure reduces the risk of serious cardiovascular events such as stroke and heart attack. In angina, it helps to reduce the frequency and severity of chest pain by decreasing the heart's need for oxygen, particularly during physical activity or stress. Atenolol selectively blocks beta-1 adrenergic receptors, which are mainly located in the heart. This selectivity means it has less effect on beta-2 receptors found in the lungs and blood vessels, potentially leading to fewer side effects compared to non-selective beta-blockers. By slowing the heart rate and reducing the force of contraction, atenolol helps the heart work more efficiently. It is usually taken once daily.

Tenormin Side Effects

Common side effects of Tenormin may include dizziness, fatigue, lightheadedness, drowsiness, nausea, vomiting, diarrhea, cold extremities, bronchospasm (especially in patients with asthma or COPD), and slow heartbeat. These side effects are usually mild and may lessen as your body adjusts to the medication. Inform your doctor promptly if you experience any serious side effects, such as:
• Allergic reactions (rash, hives, itching, swelling of the face, lips, tongue, or throat, difficulty breathing)
• Changes in mental status (including confusion, hallucinations, or memory loss)
• Confusion
• Decreased sexual ability
• Depression
• Dry eyes
• Hair loss
• Increased sweating
• Irregular heartbeat
• Muscle cramps or weakness
• Shortness of breath or wheezing
• Swelling of the ankles or feet
• Unusual tiredness or weakness
• Severe dizziness or fainting
• Significant decrease in blood pressure (hypotension)
• Worsening heart failure symptoms (increased shortness of breath, swelling, rapid weight gain)

Tenormin Precautions

Do not use Tenormin if you are allergic to atenolol or other beta-blockers. Also, do not use this medication if you have certain serious heart conditions, such as severe bradycardia (very slow heartbeat), sick sinus syndrome or AV block (unless you have a pacemaker), uncontrolled heart failure, severe peripheral arterial circulatory disturbances, or acute heart failure. Before taking Tenormin, it is essential to discuss your complete medical history with your doctor, especially if you have asthma or other lung diseases, diabetes, kidney disease, liver disease, thyroid problems, psoriasis, myasthenia gravis, Wolff-Parkinson-White syndrome, depression, electrolyte imbalances, or poor circulation (peripheral vascular disease). Inform your doctor if you are pregnant or planning to become pregnant, or if you are breastfeeding or planning to breastfeed. Atenolol can cross the placenta and may affect the fetus. It also passes into breast milk and may harm a nursing infant. Tell your doctor about all the medications you are currently taking, including prescription and over-the-counter drugs, vitamins, and herbal supplements, as Tenormin can interact with other medicines. These include other blood pressure medications (such as other beta-blockers and alpha-blockers), certain heart medications (such as digoxin, other antiarrhythmics like amiodarone, propafenone, and quinidine, and calcium channel blockers like diltiazem and verapamil), nonsteroidal anti-inflammatory drugs (NSAIDs), and certain antidepressants (including tricyclic antidepressants and selective serotonin reuptake inhibitors like fluoxetine and paroxetine). Interactions can also occur with insulin and oral diabetes medications, monoamine oxidase inhibitors (MAOIs), the bronchodilator theophylline, and the antiarrhythmic lidocaine. Certain substances like alcohol and the H2 receptor antagonist cimetidine can also interact with Tenormin. If you have diabetes, Tenormin may mask the symptoms of low blood sugar (hypoglycemia), such as a rapid heartbeat. Regular monitoring of your blood sugar is essential as directed by your doctor. If you are scheduled for dental surgery, inform your doctor or dentist that you are taking Tenormin. Do not stop taking Tenormin suddenly without talking to your doctor, as this can worsen your condition and may lead to serious problems such as chest pain or heart attack. Your doctor will usually want to gradually reduce your dose if you need to stop taking it. Tenormin may increase triglyceride levels and decrease HDL cholesterol. Monitoring may be necessary.

Use Tenormin exactly as prescribed by your doctor. It is usually taken once daily. Swallow the tablet whole and do not crush, chew, or break it. You can take Tenormin with or without food, but it is essential to be consistent with how you take it daily. Taking it at the same time each day will help you remember. Your doctor may adjust your dose based on your blood pressure and how you respond to the medication. Continue to take Tenormin even if you feel well. It may take several weeks for the full benefits of the medication to be seen. Tenormin is often part of a comprehensive treatment plan for hypertension or angina, which may also include lifestyle modifications such as diet and exercise. Store Tenormin at room temperature, away from moisture and heat. Keep all medications out of the reach of children.

Do I need a prescription to order Tenormin?

Yes, a prescription is required from your physician to order Tenormin.