Decongestants and hypertension: what to know

Oral decongestants such as pseudoephedrine or phenylephrine may tighten blood vessels. That action can increase blood pressure, make the heart work harder, or cause palpitations. Combination cold products may contain a decongestant even when the front label emphasises another symptom. Nasal sprays may act more locally, but they still need careful use and can cause rebound blockage if used too long. Risk is more relevant if you have poorly controlled hypertension, angina, heart failure, kidney disease, or a previous stroke.

Read the active-ingredient panel rather than choosing by brand name. Ask a pharmacist to check the product against your blood-pressure medicines and other conditions. Saline spray, gentle nasal rinsing with sterile or previously boiled and cooled water, fluids, and a humid environment may ease blockage without a stimulant decongestant. Do not stop prescribed blood-pressure treatment to use a cold remedy, and do not combine several cold products without checking their ingredients.

Seek urgent help for chest pain, severe breathlessness, fainting, sudden weakness, facial drooping, trouble speaking, or a severe unusual headache. Contact a clinician promptly if your blood pressure is repeatedly higher than your personal target after taking a product, or if pounding heartbeat, marked dizziness, or worsening swelling develops.

Which congestion treatments fit my blood-pressure history? Could any of my regular medicines interact with a decongestant? What symptoms should make me stop a product and seek advice?