May cause drowsiness, dizziness, headache, loss of appetite, stomach upset, vision changes, irritability, dry mouth and nose. These effects should subside as your body adjusts to the medication. If they persist or become bothersome, inform your doctor. Notify your doctor if you develop: breathing difficulties, pounding or irregular heartbeat, ringing in the ears, difficulty urinating. If you notice other effects not listed above, contact your doctor or pharmacist.