Olanzapine
Olanzapine is a thienobenzodiazepine classified as an atypical or second-generation antipsychotic agent. The second-generation antipsychotics were introduced in the 90s and quickly gained traction due to their impressive efficacy, reduced risk for extrapyramidal side effects and reduced susceptibility to drug-drug interactions. Olanzapine very closely resembles [clozapine] and only differs by two additional methyl groups and the absence of a chloride moiety. It was discovered by scientists at Eli Lilly and approved to be marketed in the US in 1996.