Antagonism of carbachol concentration-response curves by (A) 4-DAMP and (B) methoctramine in idiopathic human detrusor. Responses are expressed as the mean ± SEM. (C) Schild plots for the antagonism by 4-DAMP and methoctramine. 4-DAMP = 4-diphenylacetoxy-N-methyl-piperadine methiodide.
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