Fasting and blood pressure medication

If you take blood pressure medication, fasting may change your fluid intake, blood pressure, and medicine timing, so plan with your prescriber. Do not stop, move, or double a dose on your own; the right plan depends on the medicine, your health, and the type of fast.

Less fluid and food can alter blood pressure and may make dizziness more noticeable, particularly when standing. Some medicines are intended for a particular time or need food, while water tablets can increase urination. Missing treatment can leave hypertension less controlled and raises concern in people with a history of stroke or transient ischaemic attack. A headache or light-headed feeling may have several causes and should not be self-diagnosed.

Tell your prescriber or pharmacist when the fast starts and ends, whether water is allowed, and which medicines and supplements you take. Ask for a written schedule and what to do if you vomit or miss a dose. Check your blood pressure only as advised and record symptoms. During permitted hours, follow the fluid plan given to you. If readings are difficult to interpret, ambulatory blood pressure monitoring may provide a fuller picture.

Get emergency help for sudden weakness or numbness on one side, trouble speaking, new confusion, fainting, severe chest pressure, or severe breathlessness. Seek urgent advice for repeated dizziness, persistent vomiting, or a very unusual headache. End the fast and seek medical guidance if you feel unwell, especially if your prescriber has given you a specific sick-day plan.

Ask whether each tablet can be taken without food, whether its timing should change, how to monitor your pressure, and which symptoms mean you should seek help. Mention previous angina, stroke, or transient ischaemic attack.