The FDA recently granted fast-track status for the drug MuDelta which was created by Furiex Pharmaceuticals. MuDelta is a combo delta opioid receptor agonist(stimulates) and a mu receptor antagonist(blocks stimulation). The drug has similarities to another opioid receptor drug Naltrexone, however Naltrexone is purely a opioid receptor antagonist for the mu, kappa & to a small extent delta receptors. It does not have agonist properties and thus doesn’t stimulate any of the receptors.

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