Side effects that may occur while taking this medication include: Dizziness, Drowsiness, Dry mouth, Anxiety, Loss of balance, Headache, Upset stomach, Diarrhea, Constipation, Vomiting, Loss of appetite, Taste changes, Gas, Blurred vision Seek immediate medical help if you have a serious side effect such as: Feeling short of breath, Swelling, Rapid weight gain, Chest pain, Rapid heart rate, Fever, Chills, Sore throat, Flu symptoms, Weakness, Confusion, Seizure, Slow heart rate, weak pulse or fainting In case of an allergic reaction like skin rash, swelling of lips, face, tongue, etc. contact your doctor immediately.