Use of SSRI's wll almost completely kill the trip. Sounds as if opiate use might do the same.
Interestingly, having a benzo in the system also appears to kill the trip, but dosing a benzo once the trip has started kills only the boday load & relaxes the muscles, which always get a little restless & twitchy, for me.
I was forced to abort a trip after suffering an asthmatic attack on LSZ in summer last year. Dealing with an asthma attack tripping as well as fear-of-death anxiety was too much so I necked an Etzolam which eased the tension considerably before a paramedic turned up & eased the asthma. Once he'd gone (he was a good laugh, but I am not certain he knew we were tripping) I laid in bed watching the ceiling for an hour, the eti had done little to kill the trip, only the anxiety. On other occassions however, when I've had eti already in the system, I've found I get the sort of trip Pink described, boring basically lol
Pink, get some more & try again, if you take SSRI's try doubling the dose, neck two tabs. If that doesn't work, personally, I'd call it a day & try again when I'm clear of whatever is likely to be stopping the trip...
This is not unusual really. 1P is weight-for-weight quite a bit stronger than Al-Lad & there were peeps in PD necking five of them & coming back complaining that it didn't work. There's also all sorts other factors such as personal, idiosyncratic tolerance, chemical tolerance & such at play with psyches. It's worth tripping properly at least once in your life imo so maybe consider juggling doses &/or compounds (provided you're doing so safely!) in order to do so.
Stick with it!