Do not use Serevent if:

• you are allergic to any ingredient in Serevent;
• you are having an asthma attack (eg, sudden severe onset or worsening of asthma symptoms such as chest tightness, cough, shortness of breath, wheezing).

• Do not drive or perform other possibly unsafe tasks until you know how you react to it.
• Serevent will not stop an asthma attack once one has started. If you are also using another inhaler for asthma attacks, be sure to carry it with you at all times for use during an asthma attack.
• Try to avoid irritants that may trigger an asthma attack, such as smoke, pollen, pet dander, dust, or molds.
• If you have been regularly using a short-acting bronchodilator inhaler (eg, albuterol), talk with your doctor about how to use it with Serevent. Short-acting bronchodilators are normally only used with Serevent to treat breathing problems that may occur between doses.
• The risk of serious heart problems (eg, irregular heartbeat) may be greater if you use Serevent in high doses. Do not use more than the recommended dose or use more often than prescribed.
• If your symptoms do not get better within 1 week of starting Serevent, or if they get worse, contact your doctor right away.
• Tell your doctor at once if you notice that your short-acting bronchodilator inhaler does not work as well, if you need to use it often (eg, 4 or more times a day for more than 2 days in a row; more than 1 canister in 8 weeks), or if you have a decrease in your peak flow meter results.
• Serevent is not to be used in place of a corticosteroid. If you are using a corticosteroid medicine for asthma, do not stop or reduce the dose unless your doctor tells you to.
• Serevent may sometimes cause severe breathing problems right after you use a dose. If this happens, use your short-acting bronchodilator. Contact your doctor or seek other medical care at once.
• Diabetes patients - Serevent may affect your blood sugar. Check blood sugar levels closely. Ask your doctor before you change the dose of your diabetes medicine.
• Lab tests, including lung function tests and blood pressure, may be performed while you use Serevent. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
• Use Serevent with caution in the elderly; they may be more sensitive to its effects, especially effects on the heart.
• Serevent should not be used in children younger than 4 years old; safety and effectiveness in these children have not been confirmed.
• Pregnancy and breast-feeding: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Serevent while you are pregnant. It is not known if Serevent is found in breast milk. If you are or will be breast-feeding while you use Serevent, check with your doctor. Discuss any possible risks to your baby.

Check with your doctor if any of these most common side effects persist or become bothersome:

• headache; nasal or sinus congestion; nervousness; stuffy nose; throat irritation; tremor.

• severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, tongue, or throat; unusual hoarseness); chest pain; choking; fast or irregular heartbeat; fever; new or worsening asthma symptoms (eg, increased chest tightness, coughing, shortness of breath, or wheezing); overexcitement; severe or persistent headache or dizziness; severe or persistent muscle pain or cramps.

Serevent is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.