Hydrophobic small molecules

Hydrophobic small molecules are nonpolar molecules that do not mix or dissolve in water due to their inability to form hydrogen bonds, and instead tend to aggregate or partition into non-aqueous (organic) phases[1][7]. Common examples include hydrocarbons, steroids, fats, and many pharmaceutical drugs[7][5]. Their hydrophobic nature is largely determined by their structure—typically rich in C–H bonds, lacking significant polarity, and without hydrogen-bond donors or acceptors[7][5][1]. In biology, hydrophobic small molecules play essential roles in membrane structure, metabolic energy storage, chemical signaling (e.g., steroid hormones), and as a key driving force in protein folding and molecular recognition via the hydrophobic effect[3][5][8][2]. In drug discovery and delivery, the hydrophobicity of small molecules strongly influences absorption, distribution, metabolism, excretion, and toxicity (ADMET); while desirable for membrane permeation, excessive hydrophobicity can lead to low solubility, non-specific binding, and off-target toxicities[4][9][8]. "Hydrophobic small molecules" is not itself a drug target, but a broad chemical descriptor. There is no specific "canonical" target associated with the term "hydrophobic small molecules," and the name itself is unsuitable for use as a structured therapeutic target.

Other names

Hydrophobic moleculenonpolar small moleculelipophilic small molecule

Null (not applicable; hydrophobic small molecules are not therapeutic targets, but rather act by various mechanisms depending on their structure and context.)