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Testosterone Jab Best bet as Male Contraceptive

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Chinese researchers are on track to create an effective male contraceptive jab with none of the usual side-effects, a development that    would revolutionize family planning.

The testosterone injection works by temporarily halting sperm production by reducing levels of two regulatory brain chemicals. Previous attempts to develop an effective and convenient male contraceptive have encountered problems over reliability and side-effects, such as mood swings and a lowered sex drive. The study, which will appear in the June issue of the Journal of Clinical Endocrinology and Metabolism, was backed by the World Health Organisation.
Researchers were able to achieve a 99% success rate by injecting men with testosterone in a trial that they claim is the largest so far conducted anywhere in the world.

The latest research, conducted at the National Research for Family Planning in Beijing, injected 1,045 healthy, fertile male patients aged between 20-45 years with a testosterone-based jab over a two-year period and found only 1% went on to father a child, the Independent newspaper reported on Tuesday. Their female partners were between 18 and 38 years of age and had normal reproductive function.

Males were injected monthly with 500 mg of a formulation of testosterone undecanoate (TU) in tea seed oil for 30 months. Results showed a cumulative contraceptive failure (pregnancy) rate of 1.1 per 100 men in the 24-month efficacy phase. No serious adverse events were reported and reproductive function returned to the normal fertile reference range in all but two participants, said a NRIFP release.

“For couples who cannot or prefer not to use only female-oriented contraception, options have been limited to vasectomy, condom and withdrawal,” said Yi-Qun Gu, the lead researcher. “Our study shows a male hormonal contraceptive regime may be a potential, novel and workable alternative,” he was quoted as saying by the British daily.

Sources: The Times Of India

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