<prompt> The drug NOT used in psoriasis isPsoralensChloroquineMethotrexateCoaltar  <response>: B Chloroquine TREATMENT OF PSORIASIS: Locally by Topical coaltar. Wide spread Psoriasis: by Ultraviolet fi-spectrum alone or along with coaltar Geockerman regimen or Anthranil Ingram regimen Methotrexate Therapy: Methotrexate is drug of choice in Very Severe form of Psoriatic arthritis Methotrexate is indicated in Psoriatic erythroderma, Generalized pustular psoriasis, Intractable Crippling psoriasis. Psoralens Ultraviolet-A phototherapy PUVA: is successful in clearing delaying recurrence of Chronic Psoriasis. Etritinate, its metabolite Acitretin, are Retinoids Vitamin A derivatives: useful for Severe Resistant Psoriasis. Systemic drugs useful in Psoriasis: Hydroxyurea, Razoxane Azathioprine; Cyclosporin A and Topical Vitamin-D3 