It is not known whether Ridaura® is safe for use with injectable gold, hydroxychloroquine, penicillamine, immunosuppressive agents (e.g., cyclophosphamide, azathioprine, or methotrexate) or high doses of corticosteroids.1 Ridaura® may interact with other drugs, so it is important to share a list of all the prescription drugs, over-the-counter medications, vitamins and herbal products you use with your doctor and pharmacist. Do not start, stop or change the dosage of any medications without your doctor’s approval.