Bremelanotide better known as PT-141 is not your average erectile dysfunction drug like Viagra or Cialis, so-called PDE-5 inhibitors that work by opening blood vessels allowing blood to flush the penis. PT-141 belongs to a new class of drugs called melanocortins, which work by effecting the central nervous system PT-141, increasing sexual desire. Deep inside the brain, the peptide arouses passion by stimulating the hypothalamic and limbic emotional structures, the parts that naturally flare when you're turned on. Because of the way it effects the mind and not the genitals, it is equally as effective on woman as it is on men. Scientists aren't exactly sure how melanocortins actually work, but the results are undeniable. According to the research.. before you know it, you’re hot and ready and looking for love.