Tenolol 5mg Injection

Atenolol (5mg)

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Tenolol 5mg Injection belongs to a group of medicines called beta-blockers. It is used to treat angina (heart-related chest pain), arrhythmia (irregular heart rhythms), and hypertension (high blood pressure). It also helps to prevent future heart attacks.

Written By Dr. Swati Mishra, BDS,
Reviewed By Dr. Sachin Gupta, MD Pharmacology, MBBS,
Last updated on 03 Aug 2026 | 01:04 AM (IST)

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General Information

Contains

Atenolol (5mg)

Marketer

Ipca Laboratories Ltd

Storage

Store below 30°C

The content is shown in English

Product introduction

Tenolol 5mg Injection is given under the supervision of medical professionals along with regular monitoring of blood pressure. The dose and frequency depend on what you are taking it for and the severity of your condition. It may take several weeks before you get the full benefit of this medicine and you may need to take it for the rest of your life. However, it is important to continue taking the injection even if you feel well. Most people with high blood pressure do not feel ill and if you stop taking it, your condition may worsen.

The main side effects of this medicine are diarrhea, cold extremities, tiredness, and nausea. These are usually mild and short-lived. It may also cause shortness of breath or low blood pressure in some people. To reduce the risk of side effects your doctor will probably start the medicine at a low dose and gradually increase it. Consult your doctor if the side effects bother you or do not go away.

Before taking it, let your doctor know if you have any liver problems. It may also not be suitable for people who have a slow heart rate, severe circulation problems, severe heart failure, or low blood pressure. Pregnant or breastfeeding mothers should also consult their doctor before taking it. You must talk to your doctor to find out whether this medicine is suitable for you to use. If you get affected by dizziness, rise slowly when rising from a sitting or lying position.

Uses of Tenolol Injection

Benefits of Tenolol Injection

Treatment of Angina (heart-related chest pain)
Tenolol 5mg Injection relaxes the blood vessels so that blood can flow more easily around your body and makes sure that your heart is getting a good supply of oxygen. This makes it less likely that you will suffer chest pain caused by angina. This medicine can help increase your ability to exercise and go about your daily life more easily. It is given as an injection under the supervision of your doctor.

Treatment of Arrhythmia
Tenolol 5mg Injection is used to stabilize heart rhythms (particularly atrial fibrillation). It helps in normalizing an abnormal heart rhythm, preventing it from occurring in the first place, or slowing down the heart rate during an episode.

Treatment and prevention of Heart attack
Tenolol 5mg Injection helps lower your blood pressure and make it easier for your heart to pump blood around your body. This reduces the chances of you having a heart attack. It can also reduce the risk of dying if it is given immediately after a heart attack. It is given as an injection under the supervision of your doctor. It is given as an injection under the supervision of your doctor.

Treatment of Hypertension (high blood pressure)
Tenolol 5mg Injection belongs to a group of medicine called long-acting beta-blocker. It works by blocking the effects of some chemicals on your heart and blood vessels. It slows down your heart rate and helps the heart beat with less force. This lowers your blood pressure and helps in reducing your risk of having a stroke, a heart attack, other heart problems, or kidney problems in the future. It is given as an injection under the supervision of your doctor.

Side effects of Tenolol Injection

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Tenolol

Fatigue
Tiredness
Cold extremities
Gastrointestinal disturbance
Slow heart rate
Limited data available

How to use Tenolol Injection

Your doctor or nurse will give you this medicine. Kindly do not self administer.

How Tenolol Injection works

Tenolol 5mg Injection is a beta blocker that works specifically on the heart. It works by slowing down the heart rate and makes the heart more efficient at pumping blood throughout the body. The exact mechanism by which Tenolol 5mg Injection prevents migraines is not established yet and may vary from person to person. Tenolol 5mg Injection can prevent migraines by decreasing the excitability of the nervous system. Tenolol 5mg Injection is also believed to decrease the dilation of blood vessels that are responsible for migraine.

All substitutes for Tenolol 5mg Injection

For information purposes only. Consult a doctor before taking any medicine.

Cardaten 5mg Injection

by Ferring Pharmaceuticals

₹37.5/injection

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Quick tips

It may cause dizziness. If this happens to you, get up slowly when rising from a sitting or lying position.
It can hide symptoms of low blood sugar if you are diabetic. Monitor your blood sugar levels regularly.
Do not stop taking Tenolol 5mg Injection suddenly as it can cause your blood pressure to rise suddenly, thereby increasing the risk of heart attack and stroke.

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Tenolol 5mg Injection. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

The safety of Tenolol 5mg Injection during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.

Breast feeding

CONSULT YOUR DOCTOR

Tenolol 5mg Injection may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.

Driving

SAFE

Tenolol 5mg Injection does not usually affect your ability to drive.

Kidney

CAUTION

Tenolol 5mg Injection should be used with caution in patients with severe kidney disease. Dose adjustment may be needed.
Regular monitoring of blood pressure is recommended and can help in better dose adjustment.

Liver

CONSULT YOUR DOCTOR

There is limited data available on the use of Tenolol 5mg Injection in patients with liver disease.

Interaction with drugs

Taking Tenolol with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Life-threatening

Aminophylline (Oral Route)

If used together, Atenolol may interrupt the efficacy of Aminophylline.

Life-threatening

Theophylline (Oral Route)

Do not consume Theophylline with Atenolol in case of asthma or COPD (chronic obstructive pulmonary disease). If concurrent use is essential, watch out for breathlessness and dizziness and consult your doctor if you experience them.

Life-threatening

Theophylline (Injection Route)

Life-threatening

Aminophylline (Injection Route)

Do not consume Aminophylline with Atenolol in case of asthma or COPD (chronic obstructive pulmonary disease). If concurrent use is essential, watch out for breathlessness and dizziness and consult your doctor if you experience them.

Severe

Diltiazem (Oral Route)

watch out for symptoms such as breathlessness, fatigue, drowsiness, sedation or faintness or vomiting and consult your doctor if you experience them.

Frequently asked questions

How many hours does Tenolol 5mg Injection take to reduce high blood pressure?

Usually, Tenolol 5mg Injection starts working within 3 hours, but it can take up to 2 weeks to reach its full effect. You may not feel any difference in blood pressure after taking the medicine, but this does not mean that the medicine is not working. It is important to keep taking your medicine in the prescribed dose and duration to get the maximum benefit of Tenolol 5mg Injection.

Should I take Tenolol 5mg Injection in the morning or at night?

Tenolol 5mg Injection can be taken anytime in the morning or evening, usually prescribed once or twice daily. However, your very first dose of Tenolol 5mg Injection may make you feel dizzy, so it is better to take your first dose at bedtime. After that, if you do not feel dizzy, you may take it any time of the day. Follow the advice of your doctor. It is advised to take it at the same time each day so that you remember to take it and consistent levels of medicine are maintained in the body.

What if I forget to take a dose of Tenolol 5mg Injection?

If you have missed a dose of Tenolol 5mg Injection, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and take the next scheduled dose. Do not double the dose to make up for the missed one as this may increase the chances of developing side effects.

What if I take more than the prescribed dose of Tenolol 5mg Injection?

If you take more than the prescribed dose, your heart rate may slow down and you may find it difficult to breathe. It can also cause dizziness and trembling. If you experience any of such side effects, seek immediate medical assistance. Avoid driving yourself to avoid any mishap. Get someone else to drive you or call for an ambulance. Take the Tenolol 5mg Injection packet or leaflet inside it, plus any remaining medicine, with you.

What are the most common side effects of Tenolol 5mg Injection?

The most common side effects of Tenolol 5mg Injection include cold extremities (feeling extreme cold), fatigue, slow heart rate, nausea, diarrhea and dizziness. However, these are usually mild and short-lived and not everyone will experience these side effects. But, if these do not resolve and bother you, consult your doctor to know about ways of coping up with them. Your doctor may also suggest ways of preventing them in future.

Can Tenolol 5mg Injection cause dizziness? How do I prevent it?

Yes, Tenolol 5mg Injection can cause dizziness as a side effect. If this happens to you, you should sit or lie down until the symptoms pass. However, this is temporary and usually goes away as the treatment continues. It would be best to avoid alcohol while being on treatment, as it may worsen the dizziness.

What should I tell my doctor before taking Tenolol 5mg Injection?

Tenolol 5mg Injection is not suitable for everyone. Therefore, it is advised to inform your doctor if you are allergic to Tenolol 5mg Injection or any of its ingredients before starting treatment. You must tell the doctor if you have low blood pressure or a slow heart rate, serious blood circulation problems in your limbs (such as Raynaud's phenomenon), which may make your fingers and toes tingle or turn pale or blue. In addition to that, inform your doctor if you are suffering or have suffered from metabolic acidosis (when there's too much acid in your blood), lung disease or asthma. Let your doctor know about all the other medicines you are taking because they may affect, or be affected by, this medicine. Also, inform your doctor if you're trying to get pregnant, are already pregnant or breastfeeding to prevent any harmful effects on the baby.

Is Tenolol 5mg Injection effective?

Tenolol 5mg Injection is effective if used in the dose and duration advised by your doctor. Do not stop taking it even if you see improvement in your condition. If you stop using Tenolol 5mg Injection too early, the symptoms may return or worsen.

What other lifestyle changes should I make while taking Tenolol 5mg Injection?

Lifestyle changes play a major role in keeping you healthy if you are taking Tenolol 5mg Injection. Avoid taking excess salt in your diet and find ways to reduce or manage stress in your life. Practice yoga or meditation or take up a hobby. Ensure that you have a sound sleep every night as this also helps to reduce stress levels and helps to keep your blood pressure normal. Stop smoking and alcohol consumption as this helps in lowering your blood pressure and preventing heart problems. Exercise regularly and take a balanced diet that includes whole grains, fresh fruits, vegetables and fat-free products. Consult your doctor if you need any further guidance to get the maximum benefit of Tenolol 5mg Injection and to keep yourself healthy.

Can Tenolol 5mg Injection cause low blood potassium levels (hypokalemia)?

As per recent alert issued by government, Tenolol 5mg Injection may cause low blood potassium levels (hypokalemia) but intensity of this effect has not been established so far.

Fact Box

Chemical Class

Phenylacetamides

Habit Forming

Therapeutic Class

CARDIAC

Action Class

Beta blocker- Cardioselective

Related lab tests

Kidney Function Test

References

Westfall TC, Westfall DP. Adrenergic Agonists and Antagonists. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. p. 327.
Benowitz NL. Antihypertensive Agents. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. p. 176.
Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 98-102.
Chaves RG, Lamounier JA. Breastfeeding and maternal medications. J Pediatr (Rio J). 2004;80(5 Suppl):S189-S198. [Accessed 14 Mar. 2019] (online) Available from:

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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Ipca Laboratories Ltd
Address: 142 AB, Kandivli Industrial Estate, Kandivli (West), Mumbai - 400 067, Maharashtra

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Home

Cardiac

Beta Blocking Agents Plain

Tenolol 5mg Injection

Tenolol 5mg Injection

Save more with additional offers

General Information

Contains

Marketer

Storage

Product introduction

Uses of Tenolol Injection

Benefits of Tenolol Injection

Side effects of Tenolol Injection

How to use Tenolol Injection

How Tenolol Injection works

All substitutes for Tenolol 5mg Injection

Cardaten 5mg Injection

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Aminophylline (Oral Route)

Theophylline (Oral Route)

Theophylline (Injection Route)

Aminophylline (Injection Route)

Diltiazem (Oral Route)

Frequently asked questions

How many hours does Tenolol 5mg Injection take to reduce high blood pressure?

Should I take Tenolol 5mg Injection in the morning or at night?

What if I forget to take a dose of Tenolol 5mg Injection?

What if I take more than the prescribed dose of Tenolol 5mg Injection?

What are the most common side effects of Tenolol 5mg Injection?

Can Tenolol 5mg Injection cause dizziness? How do I prevent it?

What should I tell my doctor before taking Tenolol 5mg Injection?

Is Tenolol 5mg Injection effective?

What other lifestyle changes should I make while taking Tenolol 5mg Injection?

Can Tenolol 5mg Injection cause low blood potassium levels (hypokalemia)?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Kidney Function Test

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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