Hydrophilic drugs are characterized by being what?

Hydrophilic drugs are characterized by being what?

• A. Water soluble
• B. Lipid soluble
• C. Highly protein-bound
• D. Poorly absorbed

Answer: (A)

Hydrophilic drugs are defined by water solubility. They dissolve readily in aqueous environments and often exist as charged species at physiological pH, which limits their passive diffusion across lipid membranes and keeps distribution mainly in the extracellular fluid. This property also tends to favor renal excretion. The other options describe characteristics of lipid-soluble drugs or non-defining traits (lipid solubility is the opposite, and protein binding or absorption vary and are not defining features). So the best descriptor is water solubility.

Hydrophilic drugs are defined by water solubility. They dissolve readily in aqueous environments and often exist as charged species at physiological pH, which limits their passive diffusion across lipid membranes and keeps distribution mainly in the extracellular fluid. This property also tends to favor renal excretion. The other options describe characteristics of lipid-soluble drugs or non-defining traits (lipid solubility is the opposite, and protein binding or absorption vary and are not defining features). So the best descriptor is water solubility.