Decongestants and blood pressure: what to know

Oral decongestants such as pseudoephedrine and phenylephrine stimulate or narrow blood vessels to reduce nasal swelling. The same action can push blood pressure upward or cause a fast, pounding heartbeat. A product sold for a cold, flu, or sinus problem may contain one without making it prominent on the front label. Caution is especially relevant with hypertension, angina, heart failure, kidney disease, or a history of stroke or transient ischaemic attack.

Show the full medicine list to a pharmacist before buying a decongestant, including regular pain medicines and supplements. Consider saline spray, nasal rinsing, fluids, and humidified air for simple blockage. If a clinician recommends a product, follow the dose and duration instructions and avoid combining it with another cold remedy containing the same ingredient. Keep taking prescribed blood-pressure medicine unless your prescriber tells you otherwise, and monitor how you feel.

Call emergency services for chest pain, severe breathlessness, collapse, sudden weakness, trouble speaking, or a new severe headache. Seek prompt advice for persistent palpitations, severe dizziness, or blood-pressure readings that remain above your personal target after a decongestant. Stop and ask for guidance if symptoms begin soon after a dose.

Which decongestant ingredients should I avoid? Is a nasal option appropriate for me? How should I respond if my pressure or pulse changes after taking it?