opiate painkillers compete for the cytochrome p450 enzymes in the liver that also metabolize sex hormones.....so does trazadone......so, your liver will be working pretty hard.....it will certainly slow down the rate at which it can handle your HRT medication(s), and your hormones will slow the breakdown of opiate painkillers and trazadone. I'd be watching out for a possible toxic buildups of all those substances, and steer clear of grapefruits and grapefruit juice, as well as pommegranite and seville oranges, as they all further inhibit the cytochrome p450 enzymes.