A 18-year-old male asked:
is there a difference between histamine and methacholine?
1 doctor answer
Dr. David Bare answered
49 years experience Family Medicine
Yes different: Histamine a compound that is released by cells in response to injury and in allergic and inflammatory reactions, causing contraction of smooth muscle and dilation of capillaries. Methacholine is a synthetic choline ester that acts as a non-selective muscarinic receptor agonist in the parasympathetic nervous system. both are use to test for airway reactivity in asthma.
Answered on Jun 9, 2015
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