Deferoxamine (desferrioxamine) administered in large doses is a(n):

Deferoxamine, also known as desferrioxamine, is a chelating agent primarily used to treat iron overload conditions. When administered in large doses, it functions as a hydroxyl radical scavenger. The mechanism behind this is based on its ability to bind free iron in the body, which, when in excess, can catalyze the formation of reactive hydroxyl radicals through Fenton reactions. These radicals can cause oxidative damage to cells and tissues.

By chelating iron, deferoxamine significantly reduces the availability of free iron, thereby diminishing the oxidative stress caused by hydroxyl radicals. This property is particularly important in clinical settings where iron overload occurs, such as in patients receiving multiple blood transfusions or those with certain types of anemia.

Understanding the role of deferoxamine as a hydroxyl radical scavenger is crucial in managing oxidative stress in patients, making its identification as the correct answer appropriate. Other options like diuretics, calcium channel blockers, or antiarrhythmic agents do not align with the pharmacological actions of deferoxamine.