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 . 
Help I have a friend who is a gym goer Im not sure of his quantity or how long he has been taking steroids, but stopped recently because he had really bad neck pain. No dr or scan, ultrasound etc showed anything. Put on huge pain killer amounts didnt help alot but felt after about six weeks some relief. Until today when he thinks a prior knee issue has flared up. If this a result of steroid abuse how long before it heals? Im pretty sure he wont touch them again. He can handle all over aches and pains but these last two injuries have had him off work.
Indeed, the man whom ESPN would later find a "violent, combative player known for his short temper" inspired the league rule against throwing a helmet after having done so himself to an opponent's helmet.  Peter Alzado, Lyle's brother, later identified the years of their youth—marked by an absent, alcoholic father and an over-worked mother—as the crucible for Alzado's unremittingly fierce style of play. "That violence that you saw on the field was not real stuff," his brother held. "Lyle used football as a way of expressing his anger at the world and at the way he grew up."  Defensive end Greg Townsend , a teammate on the Raiders, contended that the savagery for which Alzado became noted represented only part of a "split personality." "Off the field," remembered Townsend, "he was the gentle giant. So caring, so warm, so giving."