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 . 
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Thank you for noting the difference between efficiency and effectiveness. I’ve tried to explain the difference to people I don’t know how many times and they just give me blank stares. Many (most?) people tend to see the two as equivalents. Something that is more efficient IS more effective. Let’s think about paperwork in a bureaucracy. You may be able to streamline (efficient) the paperwork but this may result in some important things being cut out (less effective). Having a less efficient process can keep some things from being overlooked. Of course efficiency often leads to greater effectiveness its just that people often get carried away and apply it to all situations.