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.
Anadrol cycles are normally composed of Anadrol as a kickstarting compound for the first 4 – 6 weeks where it is supplementary to other injectable base compounds that are used for similar purposes, such as Testosterone Enanthate, Deca-Durabolin (Nandrolone Decanoate), Trenbolone Enanthate, etc. It can also be utilized in the middle of a cycle in order to push through any sticking points or plateaus in training progress. Additionally, some users throw it into the end of a cycle in order to boost the end of a cycle and act as a ‘finisher’ compound in a cycle, leaving the user to end off their cycle with some very impressive strength and size gains as they move into the PCT (Post Cycle Therapy) phase.