Transient increase in serum conc of testosterone, dihydrotestosterone & acid phosphatase during the 1st wk of treatment. Institute standard treatment if spinal cord compression or renal impairment develops. Closely monitor patients w/ vertebral &/or brain metastases as well as w/ urinary tract obstruction. Decreased bone density in men who had orchiectomy. May impair ability to drive or operate machinery. Pregnancy & lactation.