What side effects may I notice from receiving Meclizine Hydrochloride?

Side effects that you should report to your doctor or health care professional as soon as possible:

-feeling faint or lightheaded, falls
-fast, irregular heartbeat

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-constipation
-headache
-trouble passing urine or change in the amount of urine
-trouble sleeping
-upset stomach

This list may not describe all possible side effects for Meclizine Hydrochloride. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.