Blood pressure and cold medicine: what to know

Decongestants such as pseudoephedrine or phenylephrine narrow blood vessels to ease a blocked nose. That same action may increase blood pressure, cause palpitations, or make some people feel restless. Combination products can hide a decongestant in a cough, cold, or flu formula. Pain relievers and duplicate paracetamol in several products are also reasons to read the label carefully.

A cough or blocked nose may come from a Common Cold, Allergic Rhinitis, or another respiratory problem. The symptom does not identify its cause by itself.

Tell the pharmacist that you have high blood pressure and list every medicine, supplement, and inhaler you use. Prefer a single-ingredient product when possible, follow the package directions, and avoid taking two cold remedies together without checking their ingredients. Saline nasal spray, warm fluids, rest, and humidified air may relieve congestion without a decongestant.

Do not stop prescribed blood-pressure medicine because you have a cold. If a product causes a racing heartbeat, marked headache, or an unusual rise in your readings, stop and seek advice about an alternative.

Seek urgent help for chest pain, severe breathlessness, fainting, new confusion, weakness on one side, or a severe sudden headache. Arrange medical review if fever persists, breathing becomes difficult, a cough lasts beyond the expected illness, or symptoms are worsening rather than settling.

Ask which decongestants and pain relievers are suitable with your blood-pressure treatment, whether a nasal spray is a safer option, and how to monitor your readings while you are unwell.