6.) All this, however, helps only if the athlete is able to mostly block out the catabolic effect of the increased cortisone level. A compound which, because of its distinct anticatabolic effect, fulfills this requirement is the beta-2 sympathomimetic, Clenbuterol. Clenbuterol successfully blocks the cortisone receptors so that the athlete is usually able to maintain a large portion of the strength and muscle mass built up by the steroids. The intake of Clenbuterol begins directly at the end of the steroid therapy and continues over 8-10 weeks (see also Clenbuterol).