The other problem with medication at the moment is that pharmaceutical companies would rather wait until a patent is about to run out on a drug, then make minor changes to the drug to create a new patentable medication (escitalopram vs. citalopram, paliperidone vs. risperidone, desvelafaxine vs. venlafaxine) or create a slow-release version, that is also patentable- Max profits, minimal input.

Also they're busy marketing lots of new health conditions that desperately need their treatment.