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Male hormonal contraception: suppression of spermatogenesis by injectable testosterone undecanoate alone or with levonorgestrel implants in chinese men

Bremner, William J.; Yang, Pei-Juan; Amory, John K.; Gao, Er-Sheng; Yang, Jie; Zheng, E-Xiang; Gui, You-Lun; He, Chang-Hai (American Society of Andrology, 2004-09)

Monthly injections of testosterone undecanoate (TU) act as a male contraceptive by reversibly suppressing spermatogenesis to azoospermia or severe oligoazoospermia in 95% of Chinese men. In 5% of Chinese men, however, monthly TU administered alone fails to suppress spermatogenesis into contraceptive ...