No specific molecular drug-like target identified

The designation 'No specific molecular drug-like target identified' refers to a category of therapeutic agents where the exact molecular entity responsible for the drug's effect is unknown or non-existent in the traditional sense (ChEMBL Database, 2024). This often occurs in phenotypic drug discovery, where compounds are identified based on their ability to alter a disease phenotype in a cell-based or animal model without prior knowledge of the target (Moffat et al., 2017). It also includes agents that act through non-specific mechanisms, such as antacids that neutralize gastric acid or osmotic laxatives that alter fluid balance (Goodman & Gilman's The Pharmacological Basis of Therapeutics). While these drugs can be highly effective, the absence of a defined target makes it difficult to apply modern structure-based drug design techniques (Swinney & Anthony, 2011). Consequently, these agents are often associated with a higher degree of uncertainty regarding off-target effects and long-term safety (Eder et al., 2014).

Other names

Unknown targetUnidentified molecular targetPhenotypic targetNon-specific mechanism of action

The mechanism of action is either unknown, phenotypic, or involves non-specific physical or chemical interactions rather than binding to a specific molecular target.