Safety Evaluation of a Potential Anti-Rheumatoid Arthritis Candidate, Levamisole

Introduction: Given the limitations and adverse effects of current rheumatoid arthritis (RA) treatments, there is an urgent need for safer and more effective therapeutic options. Levamisole (LVM) is a non-specific immunomodulator with potential for treating skin diseases, tumors, and autoimmune disorders. Recognizing LVM's potential despite its controversial reputation, this study aimed to investigate its safety profile and therapeutic efficacy towards RA.

Methods: To evaluate the potential toxicity of LVM, a 28-day oral administration was conducted in SD rats, assessing general toxicity and neurotoxicity using serum biochemical indicators, the Morris water maze test, transmission electron microscopy, and H&E staining. Subsequently, the therapeutic effects of LVM on RA were evaluated.

Results: The results showed that 30 mg/kg LVM has promising therapeutic effects in the treatment of RA with negligible toxicity from 45 mg/kg to 180 mg/kg.

Discussions: This study provides valuable preclinical data on the safety and efficacy of LVM, laying the groundwork for future clinical applications and potentially offering a safer and more effective treatment option for RA patients.