Organic cation transporters (OCTs) are a class of membrane transport proteins that are responsible for the movement of organic cations across cell membranes. These transporters play crucial roles in the absorption, distribution, and elimination of drugs and endogenous compounds in the body. OCTs are found in various tissues, including the liver, kidney, intestine, and brain, where they regulate the uptake and efflux of organic cations. Understanding the function and regulation of OCTs is important for predicting drug interactions, optimizing drug therapy, and developing new drug delivery strategies. Research in this area also aims to uncover the role of OCTs in various physiological and pathological processes, such as drug toxicity, drug resistance, and metabolic diseases.