Clenbuterol liquid clen is a adrenergic agonist with some similarities to ephedrine, but its effects are more potent and longer-lasting as a stimulant and thermogenic drug. It causes an increase in aerobic capacity, central nervous system stimulation, and an increase in blood pressure and oxygen transportation. It increases the rate at which fats are metabolized. It is commonly used for smooth muscle relaxant properties. This means that it is a bronchodilator and tocolytic.