This Minireview discusses the latest developments in modern quantum mechanics (QM)-based computer-aided drug design, especially using semiempirical QM (SQM) methods. It first tackles biochemical and biophysical quantities and the approaches to their measurements. Protein–ligand affinities are determined mostly by noncovalent interactions. The text thus illustrates how these can be accurately treated with SQM methods. Next, a construction of a modern SQM-based scoring function is presented and its applications listed. In summary, SQM-based scoring is a promising modern efficient strategy to be exploited in computer-aided drug design.