<unk>  is a non-selective muscarinic receptor agonist that is FDA approved for the diagnosis of bronchial airway hyperreactivity in subjects who do not have clinically apparent asthma.   Common adverse reactions include headache, throat irritation, Iightheadedness and itching.
Methacholine
Nomifensine
Theobromine
Anthracene
Glycopyrronium bromide
Allyl chloride
Carbachol
Rescinnamine