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We can achieve the same thing in a few hours. >> reporter: typical antidepressants target serotonin. a chemical that controls happiness. but you can't tell if it's working for four to six weeks. but this is working in a different way, working on neurons that control mood. they seem to show results within hours. for dennis, it's been a glimpse of a whole new life. >> i can get up in the morning, return calls, do the things that people do without impairment. it doesn't feel like i have to fight in order to do those routine tasks. >> reporter: it's important to note that these drugs are only avai...

Serotonin. a chemical that controls happiness. but you can't tell if it's working for four to six weeks. but this is working in a different way, working on neurons that control mood. they seem to show results within hours. for dennis, it's been a glimpse of a whole new life. >> i can get up in the morning, return calls, do the things that people do without impairment. it doesn't feel like i have to fight in order to do those routine tasks. >> reporter: it's important to note that these drugs are only available in clinical trials, so dennis has made video recordings, so he can watch the videos,...