Decongestants work by narrowing blood vessels in the nose to relieve congestion, but they can narrow vessels elsewhere too, which may raise blood pressure and speed up the heart. For people with high blood pressure, heart disease, or an irregular heartbeat, this can be a problem, especially with regular use.
Safer options for nasal congestion include saline rinses, steam, and steroid nasal sprays, and a pharmacist can recommend products formulated for people with high blood pressure. Always check combination cold remedies, as many contain a decongestant.
If you have hypertension, ask your pharmacist before buying a decongestant. Seek care if you experience a severe headache, chest pain, palpitations, or a sharp rise in your blood pressure after taking one.