What should you know about over the counter for high blood pressure?

High blood pressure often has no noticeable symptoms, so a normal-feeling day does not show whether treatment is working. Decongestants, some pain medicines, and products containing stimulants can raise blood pressure or interfere with prescribed medicines. Herbal products may also affect treatment. Do not stop or change prescribed blood-pressure medicine because of a home reading without advice.

Long-standing hypertension can affect the heart, kidneys, and blood vessels. Obesity and obstructive sleep apnoea may contribute, while chronic kidney disease can alter medicine choices.

Tell the pharmacist that you have hypertension and provide your complete medicine list before buying a cold remedy, painkiller, supplement, or weight-loss product. Check your blood pressure using the same validated monitor and a consistent resting position, then record readings and symptoms for your clinician.

Take prescribed treatment as directed and keep follow-up appointments. Ask about practical changes to salt intake, activity, alcohol, sleep, and weight if these are relevant to you; individual advice matters when heart or kidney disease is present.

Get emergency help for very high readings accompanied by chest pain, severe breathlessness, confusion, fainting, new weakness or numbness, vision loss, or difficulty speaking. These symptoms may signal angina, heart failure, stroke, or a transient ischaemic attack and should not be managed with a shop-bought product.

Ask which painkillers, cold remedies, supplements, and monitoring schedule are suitable for you, and what reading or symptom should prompt urgent contact.