What should you know about non-drying antihistamines?

These medicines block histamine, a chemical involved in sneezing, itching, watery eyes, and a runny nose. They are often used for Allergic Rhinitis, Allergic Conjunctivitis, and reactions to triggers such as pets or house dust mites. Less-drying products are generally less likely to cause a dry mouth than older antihistamines, but some people still experience sleepiness, headache, dizziness, or a dry mouth.

An antihistamine may not clear a severely blocked nose or treat wheezing. The right product and dose depend on age, pregnancy, kidney or liver problems, and other medicines.

Check the active ingredient and use the label directions. Avoid taking two antihistamines together unless a clinician specifically advises it. Alcohol and medicines that cause sleepiness can increase impairment, so avoid driving until you know your response. Reduce exposure to a known trigger when practical; washing after pet contact or keeping sleeping areas free from dust can support symptom control. Ask a pharmacist before giving a product to a child.

Get emergency help for swelling of the lips, tongue, or throat, trouble breathing, faintness, or a rapidly spreading reaction. Arrange medical advice for symptoms that keep returning, disturb sleep, affect vision, or do not improve with appropriate use. Persistent throat symptoms should be assessed rather than repeatedly covered with medicine.

Which antihistamine suits my age and health conditions? Could another medicine be causing or worsening my symptoms? Should I use a nasal or eye treatment as well? How will I know if the problem is an allergy?