Blood-viscosity reducing drugs are medicines that improve blood flow by making the blood less viscous (sticky).

The purpose of blood-viscosity reducing drugs is to decrease the thickness or stickiness of the blood, which can help to improve blood flow through the blood vessels. By reducing blood viscosity, these drugs can mitigate the risk of clot formation and improve circulation, thereby reducing the risk of cardiovascular events such as heart attacks and strokes.

Cholesterol-reducing drugs are medicines that lower the amount of cholesterol (a fat-like substance) in the blood.

Blood viscosity is determined by plasma viscosity. Another name for this is hematocrit. Other factors that influence blood viscosity are temperature and fluid levels.

Anemia can lead to decrease blood viscosity, which may lead to heart failure. Other factors influencing blood viscosity include temperature, where an increase in temperature results in a decrease in viscosity. This is particularly important in hypothermia, where an increase in blood viscosity will cause problems with blood circulation.