Male contraceptive pills will be 100% effective and have fewer adverse side effects on users. Anderson, a researcher on human reproduction at the University of Edinburgh in Scotland, said: "We have conducted a series of tests and found that male contraceptives do not have multiple side effects like female contraceptives. The side effects of female contraceptives include affecting emotional fluctuations, clotting, dizziness, nausea, and headaches. The side effects of male contraceptives should be minimal, at best leading to a slight increase in weight for the user
Experts have pointed out that another benefit of male contraceptives is that they are not as difficult to restore as removing the vas deferens, as men can recover their reproductive ability by stopping taking contraceptives for 16 weeks.
Chinese scientists have made efforts to tackle key issues and found that injecting men with Testosterone Enanthate, combined with warm birth control methods, has good contraceptive effects. This contraceptive method is particularly suitable for Asian men. Testosterone heptanoate is an ideal type of male contraceptive pill. Testosterone heptanoate is a hormone ester, which can inhibit the pituitary gland and promote the release of gonadal hormone, thus reducing the endogenous testosterone secreted by testicular interstitial cells, and ultimately blocking spermatogenesis. Clinical trials have also shown that the effect of testosterone heptaneate contraceptive pills on Asian men is significantly higher than that of Western Caucasians. In this study, although there is no racial difference in the sperm reduction rate, Asians are more sensitive to hormone induced spermatogenesis inhibition than Caucasians. More than 95% of Asians can achieve azoospermia, while only 40% to 70% of Caucasians become azoospermia.