Zoladex LA 10.8 mg Zoladex LA 10.8 mg contains Goserelin 10.8 mg, a long-acting hormonal medicine used mainly for the treatment of prostate cancer. It works by greatly reducing testosterone levels in the body, which can help slow the growth of prostate cancer cells that depend on male hormones. The medicine is formulated to release goserelin gradually over an extended period, so it does not need to be administered as frequently as shorter-acting formulations. It is given by a healthcare professional as part of a prescribed cancer treatment plan.