Although I'm no fan of big pharma or most of the medication these companies produce, anti-psychotics are something that it can be really dangerous to stop taking, unless you have been misdiagnosed. Usually they're given for rather serious disorders so in the interest of your safety do not stop taking them just to trip.
You can still trip while taking anti-psychotics, though you'll need to take a fairly large dose of whatever psychedelic you plan to trip on, in this case LSD. However, depending on the particular disorder you have, it may not be too wise to take psychedelics. It would be very helpful if you provided us with more information regarding this.