Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
dry mouth that causes trouble talking or swallowing;
little or no urination;
uncontrolled muscle movements;
vomiting, severe constipation;
fast heartbeats;
muscle weakness;
blurred vision, tunnel vision, eye pain, or seeing halos around lights;
confusion, hallucinations; or
severe skin rash.
Common side effects may include:
dry mouth;
blurred vision;
constipation; or
nausea.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Benztropine side effects (more detail)
