An increasingly popular form of self-medication due to the ongoing debate about its legalization is the use of marijuana. There is no doubt that it can be abused and it can cause problems for heavy, regular users. Nonetheless, the fact that it's been cleared for medical use in a number of parts of America for treatment of symptoms like nausea, insomnia, lack of appetite and more has made many people turn to it to treat their own problems and if it's not available for medical use where they live or they're afraid of having to see a doctor about it, they might turn to self-medicating.
Of course it is still illegal and shouldn't be relied upon for relief of symptoms. I just thought it was interesting how something that would commonly be referred to as self-medication is slowly starting to be used as actual medication.