Antihistamines and Blood Pressure Management

Key Considerations for Hypertensive Patients

The American College of Cardiology recommends intranasal corticosteroids and antihistamines as alternative therapies to decongestants for patients with hypertension who need treatment for nasal congestion 2
Second-generation antihistamines (cetirizine, fexofenadine, loratadine, desloratadine) do not elevate blood pressure and are preferred for patients with hypertension due to their lack of cardiovascular effects 1, 3
First-generation antihistamines (diphenhydramine, hydroxyzine, chlorpheniramine) also do not directly increase blood pressure, though they carry other risks including sedation and anticholinergic effects 1, 4, 5
Oral decongestants (pseudoephedrine, phenylephrine) can elevate blood pressure through alpha-adrenergic receptor stimulation 1, 2
The American Academy of Allergy, Asthma, and Immunology guidelines state that elevation of blood pressure after taking an oral decongestant is very rarely noted in normotensive patients and only occasionally in patients with controlled hypertension 1
NSAIDs can increase blood pressure by an average of 5 mm Hg, which is a separate and more significant concern than antihistamines 6, 7

For patients with hypertension needing allergy/cold relief, the American College of Cardiology recommends using pure antihistamines without decongestants as first-line therapy 1
Intranasal corticosteroids are recommended as first-line therapy for nasal congestion due to their effectiveness and lack of blood pressure effects 1
If oral decongestants are necessary, they should only be used in patients with controlled hypertension, and blood pressure should be monitored closely due to unpredictable individual responses 1, 2
The International Society of Hypertension guidelines note that sympathomimetics, including decongestants, are listed as blood pressure exacerbators 6