CAPRIN 5000IU INJECTIONcontains Heparin which belongs to the group of medicines called Anticoagulants. It is used to manage blood clots in leg veins (deep vein thrombosis), blood clots in the lung (pulmonary embolism), chest pains resulting from disease of the heart arteries (unstable angina pectoris), severe blockages affecting arteries in the legs (acute peripheral arterial occlusion).