The characteristics of the antimuscarinic activity of homatropine, gallamine and stercuronium in guinea-pig atria remained constant over the temperature range 22--37 degrees C in that a linear Arunlakshana-Schild plot was obtained with homatropine and nonlinear plots occurred with gallamine or stercuronium. A trend towards higher dose-ratios with reduction in temperature was only significant for gallamine.
        
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Li CK, Mitchelson F (1978) Effect of variations in temperature on antimuscarinic activity in guinea-pig atria Experientia34: 641-3