Hydroxychloroquine has been investigated as a potential treatment for autoimmune thyroid diseases such as Graves' disease and Hashimoto's thyroiditis. hydroquin.com generic plaquenil cost Its immunomodulatory effects may help to reduce thyroid autoantibody levels and inflammation, leading to improved thyroid function and symptom control. However, the evidence supporting its efficacy in thyroid diseases is limited, and further research is needed to clarify its role in the management of these conditions.