Degree of AChE inhibition measured in whole blood obtained at various times from non-human primates treated orally with galantamine. Filled symbols and error bars represent means and S.E.M., respectively, of results obtained from Cynomolgus monkeys treated with 0.5, 1.5, or 3.0 mg/kg galantamine HBr (n = 5, 10, and 4, respectively).