The gains made by athletes in uncontrolled observations have been much more impressive. Weight gains of thirty or forty pounds, coupled with thirty percent increases in strength, are not unusual. Such case studies lack credibility because of the absence of scientific controls. However, it would be foolish to completely disregard such observations because the "subjects" have been highly trained and motivated see the articles on pharmacology of sport and sports medicine in the countries of the former Soviet Union for more information on anabolic steroids.
A naturally occurring hormone (like testosterone) that's secreted from cells in your kidneys , erythropoietin helps regulate the production of red blood cells, which carry oxygen through the body and keep your muscles moving. Injecting artificial EPO essentially overrides your body to regulate that healthy, normal production, so you get a massive boost in performance that can also lead to blood clots if unmonitored. The synthetic version, first developed 30 years ago , has been popular with doping cyclists, including Lance Armstrong himself .
If you do not know what you are doing (. you used steroids with the most side effects, you abused the dosage, etc) then not only will you get bad side effects during the period of use, but you also will also get worst side effects after the use. Again, the degree of side effects is directly proportional to the dosage and type of the steroid and also dependent of the genetic propensity of the subject to get such side effects. Therefore, it would be impossible for me or anyone else to exactly predict what kind of side effects a user might encounter during a period of use. However, one thing is for certain. If you abused the drugs by using super high dosages and for very long periods of time, you may never be able to re-establish natural testosterone production, so you will then need to get with an endocrinologist and possibly stay on low dose testosterone therapy for life.