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Do antihistamines affect blood pressure?

Antihistamines on their own do not raise blood pressure. Second-generation types, which are non-sedating, are safe for people with high blood pressure. However, some combination products with added ingredients like decongestants can increase blood pressure.

Key points:

• Antihistamines alone have little or no effect on blood pressure.
• Second-generation antihistamines are safe for those with high blood pressure.
• First-generation sedating antihistamines may cause dizziness or low blood pressure in some cases.
• Products combining antihistamines with decongestants can raise blood pressure.

This text has been fact-checked for accuracy by medino's clinical team.