I am also prescribed quetiapine, and as an antiemetic- I really do not think it would help. This is of course anecdotal so take this with a grain of salt, but my major side effect with quetiapine is acid reflux. I have thrown up from times I have taken it recreationally due to how much acid it kicks up (300mg-600mg, prescribed 150mg). Nausea/Vomitting is also a possible side effect of Seroquel, but even beyond that Dizziness and Light Headedness is common. I feel like all of these would discount it as a possible antiemetic.