Aminoglycoside chondroitin is a polysaccharide that is mainly used to treat osteoarthritis of the knee and is not effective for osteoarthritis of the hip, shoulder and waist. In addition, glucosamine can only reduce the symptoms of osteoarthritis of the knee, it does not improve its structure or repair the damaged cartilage. If taking glucosamine can reduce the pain, it can be taken for a long time. The dose depends on the patient’s response and can be 750mg per day or 1500mg per day. if the results are not so good after taking glucosamine, there is no need to take this medicine for a long time because it can only cause waste and not really cure the disease.