Self-medication

self-med-i-ca-tion (slfmd-kshn)

noun
1. The use of over-the-counter drugs or other preparations to alleviate an illness or other condition without professional supervision.
Charlie Sheen's drug use in the past could have been a form of self-medication, as well he seems to be screwing a new model/actress/stripper every week (could be hypersexuality, could be him being a horndog).*

*This is from the Healthy Place Web Site.