When the sun is out and the grass pollen count is high, many of us reach for an antihistamine to avoid the streaming eyes and ...

Taking too much antihistamine can lead to adverse side effects and a potential antihistamine overdose. Signs may include fast heart rate, fever, and dilated pupils. People should follow the dosage ...

Xyzal (levocetirizine) and Zyrtec (cetirizine) are over-the-counter (OTC) allergy medications. Learn about their key differences, their side effects, and which one may be right for you.

especially if you enjoy eating foods high in histamine. Side effects like headaches, hives, and gastrointestinal problems can quickly spoil your day. This is the point where DAO supplements come ...