Naltrexone
"Mixed bag with this one. Did it initially help treat my obsession with alcohol by reducing cravings? Yes. Is it the only substance on earth that has rendered me impotent at times? Unfortunately, yes. It took some experimentation (I'm on other drugs) to realise naltrexone as the culprit, but I stopped a month ago and, as expected, I feel like my life is on the rise. Pun intended."