For the past 35 years, drugs to treat depression have been fairly mediocre.
Now big pharma firms are upbeat about several new drugs inspired by the nightclub drug ketamine.
According to Business Insider, Allergan is researching an injectable depression drug called Rapastinel.
And Johnson & Johnson is pursuing esketamine, the chemical mirror image of the drug.
Scientists recently called ketamine "the most important discovery in half a century.
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