Atenolol belongs to a group of medicines called beta blockers. Atenolol is a medicine used in patients with heart problems to lower the blood pressure and lower the heart rate. This information sheet describes how this medicine is given and some of its possible side effects.

How is it given?

Atenolol is usually taken once or twice a day. It is available as 25mg, 50mg or 100mg tablets, or a liquid (25mg in 5mLs). Small doses can be given using an oral syringe provided. It is important not to stop taking atenolol suddenly.

Who should not take atenolol (contraindications)?

People with the following conditions should discuss taking atenolol with their doctor

  • asthma
  • kidney disease
  • diabetes or low blood glucose
  • uncontrolled heart failure or heart block
  • Pregnant, could be pregnant, planning to become pregnant or breast-feeding
  • Raynaud’s disease

What are the side effects?

  • Gastro intestinal disturbances such as indigestion and constipation
  • Slow heart rate or low blood pressure: dizziness or fainting could be a sign of low blood pressure or slow heart rate. Please see your doctor for a check if this occurs.
  • Cold fingers and toes: beta blockers can reduce the blood flow to these areas.
  • Headache
  • Tiredness
  • Sleep disturbances such as bad dreams and difficulty sleeping
  • Low mood
If you are concerned about any of these side effects, please discuss them with your doctor.

Atenolol and other medications

Some medicines can interact with atenolol. Always check with your doctor or pharmacist before giving your child any other medicines, including herbal or complementary medicines. The following medicines are known to react with atenolol

  • Other medicines that slow the heart rate such as digoxin, verapamil and diltiazem
  • Other medicines that reduce blood pressure such as diuretics, ACE inhibitors and calcium channel blockers. Please discuss with your doctor or pharmacist before giving them to your child.

Important Information

  • Keep medicines in a safe place where children cannot reach them.
  • Keep medicines in a cool, dry place out of direct sunlight and away from heat.
  • If your doctor decides to stop treatment with atenolol, return any unused medicine to the pharmacist. Do not flush down the toilet or throw it away.
  • If you forget to give your child a dose, give it as soon as you remember. Do not give a double dose.
  • If you child vomits after taking the medicine, do not give a double dose.
  • Your family doctor (GP) will need to give you a repeat prescription for atenolol. Some medicines will need to be ordered by your community pharmacy (chemist) so arrange this in plenty of time.
Compiled by:
the Pharmacy department in collaboration with the Child and Family Information Group
Last review date:
January 2018