Glucosamine is a natural amino sugar and a key precursor in the biosynthesis of glycosaminoglycans (GAGs) and proteoglycans, which are essential structural components of articular cartilage and synovial fluid. In the Indian context, it is widely used as a Symptomatic Slow-Acting Drug for Osteoarthritis (SYSADOA) and as a dietary supplement. It is available as a prescription and over-the-counter (OTC) product, primarily as glucosamine sulfate, sourced from shellfish exoskeletons or produced synthetically.
Adult: 1000mg to 1500mg per day, administered as a single dose or in divided doses (e.g., 500mg three times daily). The 1000mg once-daily dose is common for maintenance.
Note: Administer with or after meals to improve gastrointestinal tolerance. Tablet should be swallowed whole with a full glass of water. For effervescent or powder formulations, dissolve completely in water before consumption.
Glucosamine serves as a substrate for the synthesis of glycosaminoglycans (GAGs) and hyaluronic acid, which are vital for the formation of proteoglycans in articular cartilage. It may stimulate chondrocyte metabolism, promote cartilage repair, and inhibit cartilage-degrading enzymes like matrix metalloproteinases and aggrecanases. It also has mild anti-inflammatory effects, potentially via inhibition of NF-ÎșB pathway.
Pregnancy: Category C: Animal reproduction studies have shown adverse effects. There are no adequate and well-controlled studies in pregnant women. Use only if potential benefit justifies potential risk to the fetus.
Driving: Glucosamine may cause drowsiness or dizziness in some patients. Caution is advised when driving or operating machinery until response is known.
| Warfarin/Acenocoumarol | May potentiate anticoagulant effect, increasing INR and risk of bleeding. | Major |
| Antidiabetic Drugs (e.g., Metformin, Glimepiride, Insulin) | Theoretical interaction; may reduce insulin sensitivity or secretion, potentially affecting blood glucose control. | Moderate |
| Cyclophosphamide | May reduce the efficacy of cyclophosphamide. | Moderate |
| Doxorubicin | May reduce the efficacy of doxorubicin. | Moderate |
| Ethanol | May increase gastrointestinal side effects. | Minor |
Same composition (Glucosamine (1000mg)), different brands: