Tenormin is the brand name for the medication known as atenolol. It belongs to a class of drugs called beta blockers. Atenolol is primarily used to treat high blood pressure (hypertension) and certain heart conditions such as angina (chest pain) and irregular heart rhythms.

Drug Name: Tenormin

Active Ingredient: Atenolol

Tenormin tablets



Form: Tablet

Type: Generic

Prescription Required: Rx

Availability: In Stock

Tenormin works by blocking the action of certain chemicals in the body, specifically adrenaline (epinephrine), which can cause an increase in heart rate and blood pressure. By blocking these effects, atenolol helps to relax and widen the blood vessels, reducing the workload on the heart and lowering blood pressure.

In addition to its use in treating hypertension and heart conditions, Tenormin may also be prescribed for other purposes such as prevention of migraine headaches or as part of the treatment for heart attack and heart failure.

How to use

Here are some general guidelines for using Tenormin:

  1. Timing: Take Tenormin at the same time each day to maintain consistent blood levels. It can be taken with or without food, but try to take it consistently in relation to your meals.
  2. Swallowing: Take the tablet whole with a glass of water. Do not crush or chew it.
  3. Compliance: It's important to take Tenormin regularly and not skip any doses. If you accidentally miss a dose, take it as soon as you remember. However, if it's close to the time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule.
  4. Precautions: Some drugs and conditions can interact with Atenolol or require special monitoring.


The dosage of Tenormin can vary depending on the individual's condition, age, and response to the medication. The following are general dosage guidelines:

Hypertension (High Blood Pressure):

  • The usual starting dose is 50 mg taken once daily.
  • The dosage may be increased to 100 mg per day or higher based on your blood pressure response.
  • In some cases, lower doses, such as 25 mg per day, may be sufficient.

Angina (Chest Pain):

  • The typical starting dose is 50 mg taken once daily.
  • Depending on your response, the dosage may be increased to 100 mg per day.

Arrhythmias (Irregular Heart Rhythms):

  • The initial dosage is often 50 mg taken once daily.
  • Your doctor may increase the dose up to 100 mg per day or more if necessary.
  • The specific dosage will be determined based on your heart rhythm and response to treatment.

Heart Attack (Myocardial Infarction) or Heart Failure:

  • The usual starting dose is 50 mg taken within the first 12 hours after a heart attack.
  • The dosage may be increased to 100 mg per day over time.

Side effects

Here are some common side effects associated with Tenormin:

  1. Fatigue or tiredness
  2. Dizziness or lightheadedness
  3. Cold hands or feet due to decreased blood circulation
  4. Slow heart rate (bradycardia)
  5. Low blood pressure (hypotension)
  6. Nausea or stomach discomfort
  7. Diarrhea or constipation
  8. Headache
  9. Depression or mood changes
  10. Difficulty sleeping (insomnia)
  11. Sexual dysfunction, such as decreased libido or impotence
  12. Dry eyes or blurred vision
  13. Rash or itching
  14. Shortness of breath or wheezing (in people with asthma)
  15. Masking of low blood sugar symptoms in people with diabetes (monitor blood sugar levels carefully)

These side effects are generally mild and may subside as your body adjusts to the medication. However, if any of these side effects persist or worsen, or if you experience severe or unusual symptoms, seek medical attention.

In rare cases, Tenormin may cause more serious side effects:

  1. Allergic reactions, such as difficulty breathing, hives, or swelling of the face, lips, tongue, or throat.
  2. Very slow or irregular heartbeat
  3. Chest pain or worsening angina
  4. Signs of liver problems, including yellowing of the skin or eyes, dark urine, or persistent nausea.
  5. Signs of a serious allergic skin reaction, such as a severe rash with blistering or peeling.


To ensure the stability and effectiveness of Tenormin, it is important to store it properly. Here are some guidelines for storing:

  1. Temperature: Store medicine at room temperature, ideally between 20°C to 25°C (68°F to 77°F).
  2. Protect from moisture: Keep the medication in its original packaging or container to protect it from moisture. Avoid storing it in areas with high humidity, such as the bathroom.
  3. Avoid exposure to light: Protect tablets from excessive light exposure. Keep it in a dark place, away from direct sunlight or bright artificial light.
  4. Keep out of reach of children: Store Tenormin in a secure location where children cannot access it. It is important to prevent accidental ingestion.
  5. Follow expiration date: Check the expiration date on the packaging and do not use Atenolol beyond that date. Expired medications may not be as effective or safe to use.

If you have any unused or expired tablets, it is recommended to consult with a pharmacist or local waste disposal authorities on the appropriate disposal methods. Do not dispose of medications in the regular household trash or flush them down the toilet, as it can pose risks to the environment.


An overdose of Atenolol can be potentially serious and may require immediate medical attention. If you suspect an overdose or have taken more than the prescribed amount of Tenormin, here's what you should do:

  1. Seek emergency medical help: Contact your local emergency services or go to the nearest emergency room immediately. Prompt medical attention is crucial in case of an overdose.
  2. Call your local poison control center: If available in your country, you can also call the national poison control helpline for guidance. They can provide further instructions on what steps to take.
  3. Provide information: When seeking medical assistance, provide accurate and detailed information about the medication, the dosage taken, and the timing of the overdose.
  4. Medical management: Treatment for a Tenormin overdose typically involves supportive care to manage symptoms and stabilize vital signs. Depending on the severity of the overdose, medical professionals may employ techniques such as pumping the stomach (gastric lavage) or using activated charcoal to reduce absorption of the medication.

It is crucial to remember that an overdose of Tenormin can have serious effects on the cardiovascular system and may result in low blood pressure, slow heart rate, breathing difficulties, dizziness, fainting, or even cardiac arrest. It is important to seek immediate medical attention in such situations.

Missed Doses

If you happen to miss a dose of Tenormin, here are some general guidelines to follow:

  1. Take it as soon as you remember: If you realize you missed a dose and it is not close to the time of your next scheduled dose, take the missed dose as soon as you remember.
  2. Skip the missed dose if it's close to the next dose: If it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not double up on doses to make up for the missed one.
  3. Do not take extra doses: To compensate for a missed dose, avoid taking an additional dose at the same time or close to the missed one. This can lead to an overdose and potential side effects.
  4. Follow the regular schedule: Resume taking Tenormin according to your usual dosing schedule after the missed dose. It's important to maintain consistency with your medication routine.

top page