Quetiapine is an dibenzothiazepine atypical antipsychotic agent. Its clinical antipsychotic properties and low extrapyramidal side effect is mediated through a combination of D2 and 5-HT2 receptor antagonism. It has high affinity at histaminergic H1 and adrenergic α1 receptors, moderate affinity at adrenergic α2 receptors and moderate to high affinity at several antimuscarinic receptors.