The normal daily dosage taken by athletes corresponds more or less to the dosage indications of the manufacturer and is 10-30 mg/day To prevent estrogenic side ef-fects normally 10 mg/day are sufficient, a dosage which also keeps low the risk of reducing the effect of simultaneously-taken ste-roids. Often it is sufficient if the athlete begins this preventive intake of Nolvadex only three to four weeks after the intake of anabolics.