Stellar Chemical Laboratories Pvt. Ltd manufactures Leflunomide. Stellar Chemical Laboratories Pvt. Ltd [SCL] is an I.S.O. 9001-2000 certified company. Leflunomide is an immuno-modulatory agent licensed for Rheumatoid Arthritis with a different mechanism of action to other available disease modifying drugs. It has similar efficacy and toxicity profiles to methotrexate.