they stop or dull psychedelics for most people i know..
i've heard of people being able to get high with weed on invega but also heard others say it stops the high. there is a thread in "the dark side" section of the forums of blue light with a lot of people going through invega injections.
the thing with taking drugs on anti-psychotics that i think can be dangerous is the AP's dull the high, so if you take more to try to get high, you don't really know an average that the dose is going to be. there's no starter doses with the drugs mixed with AP's. people have very different results with the amount of drugs they take. no one has an amount to tell people to take (i know this is true with regular drug use too, but it seems to be more extreme differences with people's reactions to AP's).. and also i'm not sure if mixing recreational drugs with AP's has been studied in great detail, so you could be an anomaly or new case and have a bad reaction...
i smoke weed on haldol AP injections and it works... the haldol actually doesn't even stop my schizophrenia.. i still get really high... idk. haven't really messed with any other drugs. like i said some people can get high on invega.. i think weed is pretty mild and not really as dangerous physically as some other drugs.. i'm not worried about that myself.. i wouldn't really mess with coke on AP's myself though... i mean, i'd try not to anyways.. if i had some pure coke, i don't know what i'd do.. but i'd like to say and think it'd probably be best to stay away from.... if you were put on AP's it might be best to stay away from recreational drugs in general anyways. i'm not really sure of your situation... anyways, good luck.