Blurred vision, dizziness, dry mouth, sleeplessness, irritability, stomach upset or constipation may occur the first few days as your body adjusts to the medication. If these effects persist or become bothersome, inform your doctor. Notify your doctor if you experience: chest pain, nervousness, pounding heart, difficulty urinating, mood changes, breathing difficulties, swelling. If this medication makes you dizzy or lightheaded, avoid driving or engaging in activities requiring alertness. If you notice other effects not listed above, contact your doctor or pharmacist.