Drug costs. Drug costs patient financial assistance plan available? Yes, according to www. Needymeds. Com. See their site for details and application materials. Mercaptopurine manufacturer: roxane 50 mg tabs qty: 30 = $92.99 qty: 90 = $242.98 purinethol manufacturer: gate 50 mg tabs qty: 30 = $207.99 qty: 90 = $590.97 approximate retail price provided by www. Drugstore. Com.