First-generation meds cause drowsiness (by interacting with histamine ... They're particularly good if you have congestion ...

Newer antihistamines like Claritin (loratidine) and Zyrtec (cetirizine) don't cause drowsiness but may not be as helpful with allergy cough symptoms. Research continues into how specific ...

Some antihistamines can cause drowsiness. So you want to be aware of that before you take it, and you have to start a full day of doing something. Dry mouth is a great big side effect for most ...