Potent, selective dopamine D2 and D3 receptor antagonist. Ki values are 2.8 and 3.2 nM respectively for human D2 and D3 and > 1000 nM for human D1, D4 and D5 receptors. Shows selectivity for presynaptic dopamine autoreceptors at low doses and blocks postsynaptic D2/D3 receptors at higher doses. Preferentially interacts with limbic D2-like receptors in vivo. Atypical antipsychotic/antischizophrenic agent with limited extrapyrimidal side effects and a profile distinct from that of haloperidol and remoxipride.