Symptoms of a serious allergic reaction may include: rash, itching /swelling (especially of the face/ tongue /throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects.If you notice other effects not listed above, contact your doctor or pharmacist.f any of these effects persist or worsen, notify your doctor or pharmacist promptly. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.