How do antipsychotic drugs affect healthy individuals' mental states?
Most likely feeling overly drowsy and anhedonia.
Most antipsychotic drugs are used to calm a person down, either due to Psychosis/Bipolar/MDD/Schizophrenia. So my best guess would be you would get drowsy (possibly fall asleep) and most likely have anhedonia (Inability to feel pleasure)
Kinda short answer, yet I hope it helps.