Using Glyceryl Trinitrate (GTN) tablets to treat chest pain

Nikki Harrison

  • Reference Number: HEY1233/2024
  • Departments: Cardiology, Pharmacy
  • Last Updated: 31 May 2024
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Introduction

This leaflet has been produced to give you general information. Most of your questions should be answered by this leaflet. It is not intended to replace the discussion between you and the healthcare team but may act as a starting point for discussion. If after reading it you have any concerns or require further explanation, please discuss this with a member of the healthcare team.

What are GTN tablets and how do they work?

GTN is medication used to relieve angina (chest pain). When a GTN tablet is placed under the tongue, it relaxes and widens blood vessels, which increases blood flow to the heart.

How do I use the medicine?

You should carry your GTN tablets with you at all times, and do not hesitate to use it if you develop chest pain or discomfort. Place one tablet under your tongue and follow the instructions overleaf.

Are there any side effects?

GTN widens the blood vessels that go to the brain, commonly causing headaches. Although unpleasant, this is not anything to worry about and can be relieved by taking paracetamol. People who suffer from headaches can remove the tablet as soon as their chest pain is relieved to prevent a headache from occurring.

GTN can also cause a drop in blood pressure, so use the tablets while sitting down to avoid the risk of dizziness and fainting.

These side effects happen more often with the first few doses and are likely to become less of a problem over time. If these side effects continue to be a problem, please speak to your GP.

Is there anything else I need to know?

You should continue to carry around your GTN tablets with you unless otherwise instructed by your doctor. Always read the leaflet that comes with your GTN tablets and see your doctor or pharmacist if you have any questions or concerns. Alternatively, you can contact your cardiac rehabilitation team (your team is the area in which your GP is located):

Regularly check the expiry date of your GTN tablets, and ensure you get a new prescription from your GP before this has passed. GTN tablets expire 8 weeks after opening, so write the date of opening on the tablet bottle.

Please report to your GP if you have an increase in your chest pain symptoms (e.g. if you are using your GTN tablets more than three times a week) or if they start to occur at rest.

GTN is also useful for preventing “predictable” angina symptoms. This means you can use it before undertaking an activity you know will bring on your angina. You should only use it this way if advised by your doctor.

General Advice and Consent

Most of your questions should have been answered by this leaflet, but remember that this is only a starting point for discussion with the healthcare team.

Consent to treatment

Before any doctor, nurse or therapist examines or treats you, they must seek your consent or permission. In order to make a decision, you need to have information from health professionals about the treatment or investigation which is being offered to you. You should always ask them more questions if you do not understand or if you want more information.

The information you receive should be about your condition, the alternatives available to you, and whether it carries risks as well as the benefits. What is important is that your consent is genuine or valid. That means:

  • you must be able to give your consent
  • you must be given enough information to enable you to make a decision
  • you must be acting under your own free will and not under the strong influence of another person

Information about you

We collect and use your information to provide you with care and treatment. As part of your care, information about you will be shared between members of a healthcare team, some of whom you may not meet. Your information may also be used to help train staff, to check the quality of our care, to manage and plan the health service, and to help with research. Wherever possible we use anonymous data.

We may pass on relevant information to other health organisations that provide you with care. All information is treated as strictly confidential and is not given to anyone who does not need it. If you have any concerns please ask your doctor, or the person caring for you.

Under the General Data Protection Regulation and the Data Protection Act 2018 we are responsible for maintaining the confidentiality of any information we hold about you. For further information visit the following page: Confidential Information about You.

If you or your carer needs information about your health and wellbeing and about your care and treatment in a different format, such as large print, braille or audio, due to disability, impairment or sensory loss, please advise a member of staff and this can be arranged.

This leaflet has been produced by the Hull University Teaching Hospitals NHS Trust and is available as a download:

Download the “Using Glyceryl Trinitrate (GTN) tablets to treat chest pain” leaflet

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