The reason many opt for the 2 week on/2 week off Clenbuterol cycle is simple; the body adapts to the medication and by taking a break from use you are able to maintain a positive metabolic output each and every time use begins. However, this method has a problem, for when use is discontinued the metabolism slows down due to the absence of the fat-burner that heats up your body temperature; without its presence the body temperature drops due to the mitochondria now producing less heat and the metabolism slows down. Through the incremental Clenbuterol cycle this is not a problem because the medication remains in the system through the duration of the dieting phase; but what about your bodys adaptation? By slowly and steadily incrementing the dose upwards every 2-3 weeks you do not allow your body to become accustomed; it is true, the jittery feeling often associated with this bronchodilator may be less but jittery or not has nothing to do with the medication working.
The use of Clenbuterol results in down regulation of beta receptors, and therefore, it is should be used for only short periods of time. A clen cycle generally lasts 2 to 3 weeks with a break in between cycles lasting equal to or longer than the cycle itself. The cycle should start gradually, slowly increasing the Clenbuterol dosage and then tapering off gradually. The average dose of clenbuterol is 60 to 120 mcg/day. Your best course of action is to start slow with a low dose, gauge the effects it has on your body, see how well your body handles it, and then slowly increase the dosage accordingly.