Each user experiences their own unique feelings when using steroids and coming off the drug. When someone chooses to stop using they can experience a variety of withdrawal symptoms linked to addiction. Symptoms can include mood swings, fatigue, restlessness, loss of appetite, insomnia, reduced sex drive, the desire to take more steroids, and depression. Evidence for steroid addiction is certainly not as strong as it is for other drugs like cocaine or heroin. Though it is clear that people develop a tolerance and dependence on them and willingly experience negative consequences when using steroids - both of which are signs for drug dependence.
In the end when we examine the various steroid drugs there is an important note we must discuss and to leave this out would be somewhat irresponsible. Anabolic androgenic steroids, while often referred to as drugs should not be viewed in the same typical light. Anabolic androgenic steroids are hormones, they are derived and based on hormones your body already naturally produces placing them in a bit of a unique category as compared to many of the other items you might find at your local RX. Of course the specific definitions can be a bit fuzzy at times, especially when we look at the manner in-which drugs are defined in the . Under . law drugs are defined as any substance that alters the body other than food from its normal function but guess what, alcohol is excluded from this rule and while anabolic androgenic steroids are a part of the normal human bodily function they are by no means excluded. Its a bit of a paradox as even the simplest minded can see.
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 .