Ashwagandha, Withania somnifera (L.) Dunal, for the prophylaxis against SARS-CoV-2 infection: A multicentric randomized hydroxychloroquine controlled clinical trial in Indian health care workers
Renuka Kulkarni-Munshi, Deepti Talmohite, Anand More, Jaya Chakravarty, Sandhya Kamat, Akash Khobragade, D Himanshu Reddy, Manish Patel, Divya Kajaria, Raju Singh, Sarita Kumari, Priyanka Mishra, A K Srivastava, Vivek Bhagat, Saurabh Pandey, Meena Yadav, Rahul Darnule, Shobha Bhat, Sangeeta Kansal, Sonali Munot, Dipti Kumbhar, Raakhi Tripathi, Snehalata Gajbhiye, Padmaja Marathe, Jaee Parvatkar, Dhaiwat Shukla, Prakashkumar Panchal, Jui Shah, Jayashree Bhale, Viswajanani Sattigeri, Ashish Amarsheda, Anil Avhad, Nilima Kshirsagar, Dilip M Mondhe, Arvind Chopra
Journal of Ayurveda and Integrative Medicine, doi:10.1016/j.jaim.2025.101135
Background: The study was planned when, the hydroxychloroquine (HCQ) was the only prophylactic agent approved by health authorities in several countries and no prophylactic COVID-19 vaccine was available. Objective: The present study aimed to evaluate efficacy of Withania Somnifera (L.) Dunal (WS) as a chemoprophylactic and immunomodulatory agent against SARS-CoV-2 infection. Methods: In a 12 week, randomized, open label, parallel group, two arm, comparative, multicentric, controlled trial compared WS with hydroxychloroquine (HCQ) in health care workers (HCWs). Total 400 HCWs were randomized in 1:1 ratio to receive either oral WS (500 mg for 12 weeks) or HCQ 400 mg (for 7 weeks). The primary outcome was to establish equivalence between WS and HCQ for the proportion of participants contracting SARS-CoV-2 infection. Results: Seven participants contracted SARS-CoV-2 infection: 5 in WS arm and 2 in HCQ arm. The equivalence between WS and HCQ was established for the proportion difference of participants contracting SARS-CoV-2 infection for per-protocol (PP) (1.6%, 95% CI: -1.08%-4.33%) and in subgroup analysis (ITT, mIIT, nonvaccinated and seronegative).
Author contributions All authors participated in the manuscript review and writing. 
 Conflict of interest All the authors confirm that there is no conflict of interest to declare. Cadila Pharmaceuticals Limited was the Contract Research Organization for this study. 
 Appendix A. Supplementary data Supplementary data to this article can be found online at  https://doi.  org/10.1016/j.jaim.2025.101135 .
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