Management of Over‑the‑Counter Allergy Medications in Relation to Blood Pressure

Antihistamine Safety

Second‑generation oral antihistamines (e.g., loratadine, cetirizine, fexofenadine) do not raise blood pressure and are the preferred agents for treating allergic rhinitis. 1
First‑generation antihistamines may cause sedation and anticholinergic effects but are not associated with blood pressure elevation. 1

Oral decongestants (pseudoephedrine, phenylephrine) act as α‑adrenergic agonists and can significantly increase blood pressure. [3][4][5][6]
Meta‑analysis data show that pseudoephedrine raises systolic blood pressure by ≈1 mm Hg (95 % CI 0.08–1.90) and heart rate by 2.8 beats/min in the general adult population. 3
The withdrawn agent phenylpropanolamine was found to increase systolic pressure by 5.5 mm Hg and diastolic pressure by 4.1 mm Hg. 3
The ACC/AHA hypertension guidelines explicitly list decongestants among medications that may cause elevated blood pressure. [4][5][6][7]8

Oral decongestants should be avoided in individuals with severe or uncontrolled hypertension. [4][5][6][7]
If a decongestant is deemed absolutely necessary, it should be used for the shortest possible duration. [4][5]7
Patients with pre‑existing hypertension who receive a decongestant should have their blood pressure monitored, as elevations occur more frequently than in normotensive individuals. [1][3]
Blood pressure rises are rarely observed in normotensive persons and only occasionally in those with controlled hypertension; nevertheless, inter‑individual variability warrants monitoring. 1

The ACC/AHA guidelines advise using alternative, non‑decongestant strategies for allergic symptoms. [4][5][6][7]
Nasal saline irrigation is an effective non‑pharmacologic option. 1
Intranasal corticosteroids are the most effective medication class for controlling the four major symptoms of allergic rhinitis (sneezing, itching, rhinorrhea, nasal congestion). [1][2]
Oral second‑generation antihistamines alone are appropriate for managing rhinorrhea, sneezing, and itching. 1
Leukotriene‑receptor antagonists can be added as adjunctive therapy. 1

Many over‑the‑counter “allergy” products combine an antihistamine with a decongestant; label review is essential to avoid inadvertent decongestant exposure. [9][10]
Products labeled “allergy and congestion” or “allergy‑D” typically contain a decongestant component. 1
Pure antihistamine formulations are safe for blood pressure, whereas combination products are not. [1][4]

Approximately one‑fifth of adults with hypertension regularly use OTC medications that can raise blood pressure. 11
Decongestants and non‑steroidal anti‑inflammatory drugs should be reviewed and, when possible, discontinued during evaluation of resistant hypertension. [11][10]

Over‑the‑counter cough and cold medicines, including decongestants, should generally be avoided in children younger than six years because of limited efficacy and potential toxicity. 2
Use of these agents in infants and young children has been linked to severe adverse events such as agitation, psychosis, ataxia, hallucinations, and death. 3