Hydroxychloroquine Sulphate Indications Bioquin is indicated in- Pharmacology Hydroxychloroquine Sulphate synthetically produced version of quinine. It acts as an immunosuppressant by inhibiting production of rheumatoid and acute phase reactants. It also accumulates in white blood cells, stabilizing lysosomal membranes and inhibiting the activity of many enzymes, including collagenase and the proteases that cause cartilage breakdown. […]