Common side effects of Zyrtec include sleepiness, tiredness, and dry mouth. Zyrtec can interact with other medications that cause drowsiness, such as opioids and sleeping pills. Rarely, Zyrtec can ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Allergy season is in full swing, and chances are, if you're one of the 25 percent of adults who suffer ...