“男性避孕药”（参见：避孕药）
多年以来，人们一直在谈论研制男性避孕药。这样的避孕药会抑制男性产生精子并由此使其不育。可是，人们总是怀疑即使男性有机会服用这种避孕药，他们是否愿意服用？所以，制药公司从未设法努力去研制男性避孕药。最近，这种局面似乎在改变。事实上，现在正在测试各种各样的男性避孕药，它们是一些皮下埋植剂型和肌肉注射剂型。一种新型的可逆非激素类避孕注射针剂似乎大有希望。印度研制了这种注射进输精管的注射避孕药，称为（医生）指导用可逆抑精剂（Reversible Inhibition of Sperm Under Guidance ，简称RISUG），只可惜因为它的价格低廉和长效（假如是这样的话），缺乏产生规模化临床试验需求和大规模投放市场的动机。于此相反，男性激素类避孕剂（hormonal contraceptives）（也为注射剂型）则有希望有利可图，极可能在不久的将来被大范围运用。

The “Male Pill”
For many years there has been talk about developing a contraceptive pill for men. Such a pill would suppress the production of a man’s sperm cells and thus make him infertile. It has always been doubted, however, that men would take such a pill even if they had the opportunity. Therefore, pharmaceutical companies never tried very hard to develop it. Recently, this seems to have changed. In fact, various male contraceptives are now being tried as implants and as injections. A new reversible non-hormonal injection seems especially promising. This injection into the vas deferens was developed in India, and it is called Reversible Inhibition of Sperm Under Guidance (RISUG). Unfortunately, because of its low cost and long-lasting effect (if so desired), there is little incentive to run the necessary large-scale trials and to put great sums into marketing it. In contrast, hormonal contraceptives (also in the form of injections) for men promise to be profitable and are likely to become widely available in the near future.