Antipsychotic drugs or Neuroleptics are drugs that act on the central nervous system, and that usually have sedating properties. The name "neuroleptic" was introduced in 1955, from the 1990s, the term "antipsychotic" is used more frequently. Neuroleptics make the patient calm. Today, they are mostly used for the treatment of psychosis, as it occurs in schizophrenia and bipolar disorder. They can also be used to treat depression and mood swings. Very strong antipsychotics can be combined with an opioid to produce a special analgesic; the patient will be conscious, but heavily sedated, and feel very little pain.