Optimal therapeutics depends on the availability of comprehensive information. However, the PDR contains only the limited dose information from package inserts. Because the PDR was originally developed as a promotional device, there is no mechanism by which all clinically relevant dose-response data or important postrelease discoveries are regularly and rapidly incorporated into it. Thus, a gap exists in the availability of current and comprehensive dose information for physicians. This article provides information on lower, effective doses for 48 major medications, with an extensive reference list-a compilation of low-dose information not previously published, to our knowledge, in the medical literature. Physicians must have a readily accessible source of current and complete dose-response information to individualize drug therapy and minimize the risks of ADEs.