Postpartum psychoses are rare, yet severe disorders still affect 1–2 women per 1, births. (e.g., olanzapine or Zyprexa), and occasionally benzodiazepines (e.g., lorazepam or Ativan). a new onset or a recurrence of a previous illness. Lorazepam is a benzodiazepine, an anti-anxiety agent and sedative which binds to benzodiazepine receptors Lorazepam may be used during the early postpartum period, particularly where anxiety and/or insomnia due to Onset of Action. The onset of puerperal psychosis occurs in the first 1–4 weeks after childbirth. .. oxazepam, lorazepam, aspirin, acetaminophen, VPA, and olanzapine (OLZ).