Nervousness, dry mouth, fatigue, and drowsiness are some of the more common side effects that have been reported with Claritin-D®. Side effects of the medication are typically minor and don't require medical attention, but it is possible to develop serious side effects of Claritin-D. Notify your healthcare provider immediately if you experience difficulty passing urine, seizures, or breathing problems.
(Click Side Effects of Claritin-D for more information on other side effects that may occur with the drug, including rare but potentially serious side effects that require immediate medical attention.)