Transdermal patches (adhesive patches placed on the skin) may also be used to deliver a steady dose through the skin and into the bloodstream. Testosterone-containing creams and gels that are applied daily to the skin are also available, but absorption is inefficient (roughly 10%, varying between individuals) and these treatments tend to be more expensive. Individuals who are especially physically active and/or bathe often may not be good candidates, since the medication can be washed off and may take up to six hours to be fully absorbed. There is also the risk that an intimate partner or child may come in contact with the application site and inadvertently dose himself or herself; children and women are highly sensitive to testosterone and can suffer unintended masculinization and health effects, even from small doses. Injection is the most common method used by individuals administering AAS for non-medical purposes. 
Radiculopathy occurs when something irritates a spinal nerve—say a “slipped disc” causing a pinched nerve. This is also called sciatica . There are resident stem and other cells in the local tissues everywhere in our body. Many live around blood vessels. These are obviously also present in the disc and nerves in the epidural space and they usually play an important role in suppressing inflammation and repairing damage. We know, based on a copious in vitro (lab) data, that the high-dose steroids used in epidural injections can kill these cells. So the progression of the series of epidural steroid injections looks a little something like this:
There are other side effects that can occur as a result of steroid usage, and some side effects are more common in one class of steroid than others. Most all of the side effects of steroids can be mitigated through diet, other treatments, and management of your steroid usage. The key is to make sure that you understand what you’re getting into with any steroid, and be prepared to make adjustments and monitor the effects of the steroid closely. Don’t just be on the lookout for the good parts like muscle and strength growth. Also keep your eyes open to the negative effects as well. If you do, and react accordingly, you can keep the good effects and minimize the negative effects on your body.