(enbril)- I would like to know the side affects of this drug, and how to prevent some of the danger of using it.?

See below. Visit this site for information on this topic:
https://www.webmd.com/drugs/2/drug-16772/enbrel-subcutaneous/details/list-sideeffects.

Enbrel (etanercept) There are many documented side effects the most common being rash, headache, respiratory tract and other infections. You'll be at higher risk for infections so anything you can do to keep germs from getting into your eyes, nose and mouth will help. Really try to have good hand hygiene (washing/alcohol gels) and try to stay as healthy as possible!