The molecular w eight of hydroxych loroquine sulfate, USP is 433.95, and molecular formula is C 18H26ClN3O.H2SO4. Hydroxychloroquine sulfate tablets, USP contain hydroxychloroquine sulfate, USP 200 mg equival ent to 155 mg of base, and are for oral administration. Inactive In gredien ts: Crospovidone, lactose monohydrate and magne sium ste arate.