Safety of Cetirizine in Stage 2 Hypertension

Key Safety Considerations

Cetirizine does not elevate blood pressure and is a second-generation antihistamine with no sympathomimetic activity, making it appropriate for hypertensive patients 1
The concern with cold medications in hypertension relates specifically to oral decongestants (pseudoephedrine, phenylephrine, phenylpropanolamine), not antihistamines 1
Oral decongestants should be used with extreme caution in patients with stage 2 hypertension, as they can elevate blood pressure through alpha-adrenergic stimulation 1
Pseudoephedrine and phenylephrine can cause blood pressure elevation, though this is "very rarely noted in normotensive patients and only occasionally in patients with controlled hypertension" 1

Do not confuse antihistamines with decongestants: Many combination cold products contain both cetirizine AND pseudoephedrine—ensure the patient receives cetirizine alone 1
Monitor blood pressure if any decongestant is added: If nasal congestion requires treatment beyond antihistamines, topical decongestants (oxymetazoline) for short-term use (<3 days) are safer than oral agents 1
Continue antihypertensive therapy: Stage 2 hypertension requires ongoing pharmacological treatment with combination therapy (ACE inhibitor/ARB plus CCB or thiazide diuretic), which should not be interrupted 2