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Rarely, this medication can cause a serious (rarely fatal) allergic reaction. Get medical help right away if you notice any symptoms of a serious allergic reaction, including: flushing/rash, itching/swelling (especially of the face, tongue, throat), severe dizziness, fast/weak heartbeat, or trouble breathing. To be sure that you do not have a serious reaction, you will need to stay in a health care setting for 30 minutes after taking this drug for the first time so your doctor can carefully monitor you and provide medical help if needed. Your doctor will also prescribe another medication (epinephrine) to use if you have a serious allergic reaction outside the health care setting. Read the Patient Information Leaflet for this medication provided by your pharmacist. Learn ahead of time when and how to use your brand of epinephrine, and get medical help right away if you have to use it. Certain medical conditions may increase the seriousness of an allergic reaction or your risk for an allergic reaction. These include high blood pressure, breathing disorders such as asthma, or heart problems such as angina/irregular heartbeat/previous heart attack. Also, some medications (including beta blockers such as atenolol) may make epinephrine or other rescue medications not work as well or increase your risk for side effects from these medications. Be sure to tell your doctor about all the drugs you use (including prescription/nonprescription drugs and herbal products).

Mild mouth/eye/ear/throat itching, throat dryness/irritation, cough, mouth/tongue swelling, or mouth blisters may occur, especially during the first few days of treatment. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor 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. Get medical help right away if you have any very serious side effects, including: throat tightness/swelling, trouble swallowing/breathing, chest pain, voice changes. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction (see also Warning Section). This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

See also Warning Section.