PRECAUTIONS: Before using methacholine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: asthma.Before using this medication, tell your doctor or pharmacist your medical history, especially of: seizures, heart disease, thyroid disease, trouble urinating (urinary obstruction), stomach ulcers, seasonal allergies/"hay fever" (allergic rhinitis), history of being exposed to air pollutants, recent/current flu, other lung disease (e.g., cystic fibrosis, chronic obstructive pulmonary disease-COPD).During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.It is unknown if this drug passes into breast milk. Consult your doctor before breast-feeding.
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