The first drug used to treat psychosis was chlorpromazine, which was developed in the 1950s. It was initially marketed as a sedative, but its antipsychotic effects were quickly recognized. Other drugs, such as haloperidol and fluphenazine, followed in the 1960s and 1970s. These drugs, known as typical antipsychotics, are still used today to treat schizophrenia and other psychotic disorders. In the late 1980s and early 1990s, a new class of antipsychotics, known as atypical antipsychotics, were developed. These drugs are generally better tolerated than the typical antipsychotics and have fewer side effects. Atypical antipsychotics are now commonly used to treat psychosis.