Treatment with Benicar was well tolerated, with an incidence of adverse reactions similar to placebo. Events generally were mild, transient and had no relationship to the dose of Benicar. The overall frequency of adverse reactions was not dose-related.
Sometimes you may also get an itchy rash on your skin, called hives. Antihistamines reduce or block histamines, so they stop allergy symptoms. Antihistamines work well to relieve symptoms of different types of allergies, including seasonal (hay fever), indoor, and food allergies, but they can't relieve every symptom. To treat nasal congestion, your doctor may recommend taking a decongestant.
Allergy medication list. Antihistamines used to treat allergy symptoms fall into two broad categories: sedating and non-sedating. The first category includes the older antihistamines. These allergy drugs relieve allergy symptoms but cause drowsiness and other side effects, including dry mouth. Newer antihistamines are said to be non-sedating, although some users may experience drowsiness even from these.