The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
Overdosing or abuse of this drug can lead to health complications such as oily skin, acne, exacerbation of male pattern baldness, growth of body/facial hair, deepening of the voice, and menstrual irregularities. The use of Mesterolone is not recommended to patients with carcinoma of the prostate or those who are undergoing androgen therapy of any kind, including the use of Proviron. In case a dose of this drug has been missed and it is almost time for the next dose, the first dose should be ignored and the next dose should be taken at the designated time. Under no circumstances, two doses of the drug should be taken together for the dose that was missed. Medical advice should be sought without any delay and use of Proviron should be stopped immediately if side effects such as pain in liver area, headache, loss of appetite, depression, unexplained weight loss, aggression, symptoms of an enlarged prostate (change in urination), acne, or hirsutism are experienced.
The oral use of stanozolol can also have a profound impact on levels of SHBG (sex hormone-binding globulin). This is a characteristic of all anabolic/androgenic steroids, however its potency and form of administration make Stanozolol particularly noteworthy in this regard. Since plasma binding proteins such as SHBG act to temporarily constrain steroid hormones from exerting activity, this effect would provide a greater percentage of free (unbound) steroid hormone in the body. This may amount to an effective mechanism in which stanozolol could increase the potency of a concurrently used steroid. To further this purpose one could also addition Proviron, which has an extremely high affinity for SHBG. This affinity may cause Proviron to displace other weaker substrates for SHBG (such as testosterone), another mechanism in which the free hormone level may be increased. Adding Stanozolol and Proviron to your next testosterone cycle may therefore prove very useful,, markedly enhancing the free state of this potent muscle building androgen.