Organic cation transporters (OCTs) are proteins found in cell membranes that facilitate the movement of organic cations, which are positively charged molecules, into and out of cells. These transporters play a crucial role in various physiological processes, including drug metabolism, neurotransmitter regulation, and the elimination of toxins from the body. OCTs are essential for the uptake of certain medications, influencing their effectiveness and side effects. They are primarily located in organs such as the kidneys, liver, and intestines, where they help maintain the balance of organic cations in the bloodstream and tissues, contributing to overall health and homeostasis.