Aten 100

Tablet · Zydus
PRESCRIPTION MEDICINE

Aten 100 is a tablet made by Zydus that contains Atenolol 100 mg. Atenolol is a beta blocker: lowers blood pressure and heart rate; prevents angina.

Ingredient (salt)Amount
Atenolol100 mg

What it is used for

Lowers blood pressure and heart rate; prevents angina.

How it works

A beta blocker that slows the heart and lowers its workload; for high blood pressure, angina and irregular heartbeat.

How to take it

Usually 25 to 100 mg once a day.

Common side effects

  • Tiredness
  • Cold hands and feet
  • Slow pulse
  • Dizziness
  • Vivid dreams

Get medical help straight away if

  • Breathlessness or wheeze
  • Very slow pulse or fainting
  • Swollen ankles or rapid weight gain

Be careful

Do not stop suddenly. Can cause tiredness or cold hands.

Other medicines and interactions

Do not stop suddenly (it can trigger chest pain or a heart attack); taper as advised. Verapamil and diltiazem together can slow the heart dangerously. Can hide low sugar warning signs in diabetes.

Pregnancy and breastfeeding

Some beta blockers (such as labetalol) are used in pregnancy; ask your doctor whether yours is suitable. Babies may need watching for slow heart rate or low sugar after birth.

Same ingredients, different strength or form

Aten 50Aten 25

Common questions

What is Aten 100?

Aten 100 is a tablet by Zydus containing Atenolol 100 mg.

What is Aten 100 used for?

Lowers blood pressure and heart rate; prevents angina.

How should I take Aten 100?

Usually 25 to 100 mg once a day. Always follow the dose your doctor or the pack gives.

What are the side effects of Aten 100?

Common side effects include: Tiredness, cold hands and feet, slow pulse, dizziness, vivid dreams. Get medical help straight away for: Breathlessness or wheeze, very slow pulse or fainting, swollen ankles or rapid weight gain.

Does Aten 100 need a prescription?

Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.

Can I take Aten 100 in pregnancy or while breastfeeding?

Some beta blockers (such as labetalol) are used in pregnancy; ask your doctor whether yours is suitable. Babies may need watching for slow heart rate or low sugar after birth.

What are the substitutes for Aten 100?

We have no other brand with exactly the same composition and strength in our list yet. Ask your pharmacist for an equivalent.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Composition checked against pack details from large Indian online pharmacies. Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.