Specificity in treatment of diseases

摘要

A drug is modified by covalently coupling a blocking group to the drug via a nitrogen atom in the blocking group. The blocking group in the modified drug prevents metabolic conversion and sequestration of the drug in non-target cells, and the blocking group is enzymatically removed in the target cell. Particularly contemplated advantages of presented compounds and methods include reduction of cytotoxicity by inhibition of metabolic conversion to potentially cytotoxic metabolites, reduction of dosages of drugs by reduction of sequestration into non-target cells, and increase of selectivity of a drug.