Displaying 5 results of Donepezil Stable Isotopes Donepezil Stable Isotopes are a set of isotopes that have the same number of protons and electrons as the standard form of Donepezil, but differ in the number of neutrons. These isotopes are used in pharmacokinetic and pharmacodynamic studies to understand the metabolism and efficacy of Donepezil. They are also used in forensic analysis to identify the source of the drug. The stable isotopes of Donepezil include Carbon-13, Nitrogen-15, and Deuterium.