1. A computer-assisted method of processing a drug information source, the method comprising: creating a drug rule syntax comprising (a) drug rule syntax elements, each corresponding to a subset of a logical proposition, and (b) allowable logical relationships between said drug rule syntax elements; detecting at least one instance of drug rule content from a drug information source; and parsing drug rule elements from at least one identified instance of drug rule content into the drug rule syntax, retaining associations described in said drug rule content between drug rule elements that form a drug rule, whereby a subset of the drug information source is processed into syntax-parsed drug rules.