A prodrug is a pharmacologically inactive compound that is converted into an active drug once it is metabolized within the body. Prodrugs are designed to improve the pharmacokinetic or pharmacodynamic properties of a drug, such as increasing its solubility, bioavailability, or stability. Prodrugs can be used to target a specific site of action, reduce toxicity, or improve the overall therapeutic effect of a drug. Researchers in this area study the design, development, and evaluation of prodrugs to enhance the efficacy and safety of pharmaceutical compounds.