Valium dependent individuals eventually have to take more and more Valium more frequently to achieve the desired effects, and this can happen when someone is legitimately prescribed the drug or abusing the drug illicitly.
Students who use Adderall non-medically also commonly take central nervous system depressants such as pain relievers or tranquilizers, which puts them at even higher risk of dependence or abuse, to counteract the stimulant effects of the drug.
Xanax and other benzodiazepines have been found to share many of the common undesirable side effects of the highly addictive barbiturates that they were intended to replace.
When Ecstasy was first synthesized it was thought that it may be of use as an appetite suppressant.