A double-blind, randomized, placebo-controlled study to assess the efficacy of Andrographis paniculata standardized extract (ParActin®) on pain reduction in subjects with knee osteoarthritis

Phytother Res. 2019 May;33(5):1469-1479. doi: 10.1002/ptr.6339. Epub 2019 Apr 10.


Andrographis paniculata Wall (Acanthaceae) is becoming more recognized for its anti-inflammatory and antioxidant properties. A randomized, double-blind, placebo-controlled study was conducted to assess the efficacy of an andrographolide-containing supplement, ParActin® (300 and 600 mg daily), on Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain reduction in patients with knee osteoarthritis. Joint stiffness, physical function, changes in the SF-36 quality of life questionnaire, a fatigue scale, and safety were also evaluated. A total of 103 male and female patients with I-II osteoarthritis of the knee joint were assessed. Patients treated with 300 or 600 mg/day of ParActin® showed a significant reduction in pain at days 28, 56, and 84 compared with a placebo group. WOMAC stiffness scores, physical function score, and the fatigue score showed a significant improvement in both ParActin®-treated groups compared with the placebo group. At the end of the study, the quality of life (SF-36 questionnaire) and Functional Assessment of Chronic Illness Therapy (FACIT) scores showed significant improvements in both ParActin®-treated groups compared with the placebo group. Overall, it can be concluded that ParActin® in 300 and 600 mg/day dosages were found to be effective and safe in reducing pain in individuals suffering from mild to moderate knee osteoarthritis.

Keywords: Andrographis paniculata; knee osteoarthritis; pain; stiffness.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Aged
  • Andrographis / chemistry*
  • Dietary Supplements
  • Double-Blind Method
  • Female
  • Humans
  • Male
  • Middle Aged
  • Osteoarthritis, Knee / drug therapy*
  • Pain / drug therapy
  • Pain Measurement
  • Plant Extracts / pharmacology*
  • Quality of Life*
  • Surveys and Questionnaires


  • Plant Extracts

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