Drugs come in many forms; illegal, prescription and even over the counter medications that, if abused, can lead to a serious dependency. From street drugs, such as heroin, cocaine, fentanyl and methamphetamine to prescribed medications, like Oxycodone and Vicodin and even those bought from a pharmacy, for example, codeine; all alter the chemistry of the brain and create a need, both mentally and physically to continue feeding the addiction.