metaproterenol: a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness
bronchodilator: a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs
identification particle: a tiny particle of material that can be added to a product to indicate the source of manufacture