A Multicenter, Randomized, Open Label, Two Treatment, Two Period, Two Sequence, Single-dose, Two-way, Crossover, Bioequivalence Study of Methotrexate Tablets USP, 2.5 mg Manufactured by Amneal Pharmaceuticals, With Methotrexate Tablets USP 2.5 mg Manufactured for DAVA Pharmaceuticals, Inc., Fort Lee, NJ 07024 USA in Patients With Mild to Severe Psoriasis or Rheumatoid Arthritis, Who Are Already on Established Regimens of 2.5 mg Every 12 Hours Under Fasting Condition. A Multicenter, Randomized, Open Label, Two Treatment, Two Period, Two Sequence, Single-dose, Two-way ...