I know this is an old thread but it comes up on search engines and I think it'd be good to post a prospectively viable solution. When a user takes stimulants, there is a highly complex cascade of reactions which acts as a "tolerance mechanism" in several aspects, and triggers epigenetic changes. Some of the more emotionally-evident differences in day-to-day life are due to outcomes of these reactions, (where essentially neurons in the brain say "Hey; there is neuronal overexcitation of dopamine, or serotonin, etc. Let's make physiological changes to be less receptive to those neurotransmitters."), and internalization of receptors as well as downregulation of gene expression for receptors occurs. I think even upregulation for transporters and vesicles may occur, to help store away the neurotransmitters.
This very same "tolerance mechanism", which enables this form of neuroplasticity in the brain, can be exploited. We can make the brain's neurons naturally do the opposite -- re-sensitize to neurotransmitters, by externalizing receptors and upregulating gene expression, and maybe even downregulation for transporters and vesicles. How? Well you've enjoyed yourself under the influence of stimulant drugs time and time again. Now it's time to pay the price: induced depression. Most people are concerned about their day-to-day anhedonia (lack of enjoyment in things usually found enjoyable) because their dopamine neurons are fried and desensitized to dopamine. Spend several months without any reward; but rather -- feelings of despair, and your brain will start to re-sensitize, to milk what ever bit of reward dopamine can bring during this phase.
Okay, but HOW how? The answer: methyldopa. It crosses the blood-brain barrier and blocks production of dopamine. I'm thinking maybe up to a 750 mg daily dose, but each person reacts differently. Continue for 4 to 6 months of living with depression, and then after you stop, you will feel like the person you've been before you touched stimulants!
This regimen would also serve as a cure for chonic/old-age depression, and Parkinson's Disease. Because of this, the pharma co's made sure that methyldopa be deemed somewhat "harmful" and created a version that does not cross the blood-brain barrier, so anything other than methyldopa won't work. Because of course, if we went around curing profitable diseases, it would be an epic no-no in this messed up world. Shun the cures! Praise the sick! Pipe the money! More! MORE! MOAR!! GREED!!!!! okay i'll stop there lol