Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.Call your doctor at once if you have a serious side effect such as:
fast or slow heart rate;
pounding heartbeats, chest tightness;
numbness or tingling; or
feeling like you might pass out.
Less serious side effects may include:
drowsiness, dizziness, tired feeling;
dry mouth;
constipation;
stomach pain;
weight gain;
headache; or
feeling irritable.
