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“Local application onto the nasal mucosa of capsaicin and nicotine as well as metacholine induced a concentration dependent muscarinic antagonist sensitive increase in the secretory response.”
Acta physiologica Scandinavica. Supplementum • 1991 | View Paper
“2 Pretreatment with muscarinic receptor antagonists almost completely abolished the secretory response to both capsaicin and nicotine, and blocked methacholine‐induced secretion.”
British journal of pharmacology • 1989 | View Paper
“Each antimuscarinic inhibited the single unit afferent activity of capsaicin sensitive C fibers but not of capsaicin insensitive C fibers at the highest dose.”