Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
Of course, there is something women will need to concern themselves with that men will not, and it revolves around virilization as we discussed a little at the very beginning. There are very few women who desire such traits or effects, and if you supplement with responsible doses for proper periods of time (please see the Winstrol Doses link) most women will not have the first problem. Of course, if you surpass these amounts virilization is go ing to occur, and unfortunately, in some cases, it will occur even with responsible use. We are all unique human beings, and we all respond to different things differently; you may be able to eat eggs just fine, but some cannot or it tears their stomach apart. This is the nature of life, it may not be fair, but it is again the nature of life. With this in mind, if for any reason virilization symptoms begin to show, assuming you don't want them you are strongly encouraged to discontinue use immediately. If you do, they will fade away rather quickly, but if ignored they may very well make a permanent home in and on you.