I can't orgasm anymore due to medication (Suboxone)

"However, even with a small amount I cannot reach orgasm. I get turned on and my body reacts right in every other way except that one."

I noticed the same with a couple different recreationals. I found out you got to take it up a notch. Get out of your comfort zone but keeping it arousing. It doesn't necessarily have to be really far out of the zone. But case by case, some times it does. If I do that my heart rate goes up I can feel my arousal levels take off. Play with that next time.