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SIDE EFFECTS: Headache, nausea, vomiting, nervousness, dizziness, shaking (tremor), trouble sleeping, stomach upset, dry mouth, bad taste, cough, sore throat, or runny nose may occur. If 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.Tell your doctor immediately if any of these unlikely but serious side effects occur: fast/pounding/irregular heartbeat, muscle cramps, weakness.Seek immediate medical attention if this unlikely but serious side effect occurs: chest pain.Rarely, this medication has caused severe (rarely fatal), sudden worsening of breathing problems/asthma (paradoxical bronchospasm). If you experience sudden wheezing, seek immediate medical attention.A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: 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.In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking metaproterenol, tell your doctor or pharmacist if you are allergic to it; or to similar bronchodilators (e.g., albuterol, levalbuterol, salmeterol); or to sympathomimetic drugs (e.g., epinephrine, pseudoephedrine); or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: heart disease (e.g., high blood pressure, abnormal heart rhythm, coronary insufficiency), seizures, overactive thyroid (hyperthyroidism), diabetes, low blood potassium level (hypokalemia).This drug may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.Caution is advised when using this drug in the elderly because they may be more sensitive to the effects of the drug, especially the effects on the heart.During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.