A series of 4-(2-methylimidazol-1-yl)-2.2-diphenyltlutyramide derivatives was prepared as part of a search for subtype-selective antimuscarinic agents. On the basis of measurements of the antimuscarinic activity and subtype-selectivity for Mt and M-3 muscarinic receptors, the structure-activity relationships of these compounds are discussed, (C) 1998 Elsevier Science Ltd. All rights reserved.