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 market, it is primarily used as a Symptomatic Slow-Acting Drug for Osteoarthritis (SYSADOA) and as a dietary supplement. It is available as Glucosamine Sulfate, Glucosamine Hydrochloride, and N-Acetyl Glucosamine (NAG), with the sulfate salt being the most clinically studied form for osteoarthritis. Its efficacy is attributed to its chondroprotective and mild anti-inflammatory properties.
Adult: Glucosamine Sulfate: 1500 mg once daily OR 500 mg three times daily. Glucosamine HCl: 1500 mg daily. Often combined with Chondroitin Sulfate (1200 mg) and/or MSM.
Note: Take with a full glass of water. Preferably taken on an empty stomach (at least 1 hour before or 2 hours after meals) for optimal absorption, but can be taken with food if GI upset occurs. Capsules/tablets should be swallowed whole.
Glucosamine serves as a substrate for the biosynthesis of glycosaminoglycan chains (like hyaluronic acid, keratan sulfate) and subsequently for the production of proteoglycans in articular cartilage. It stimulates chondrocyte metabolism, promotes the synthesis of proteoglycans and collagen, and inhibits degradative enzymes such as matrix metalloproteinases and aggrecanases. It may also have mild anti-inflammatory effects by inhibiting NF-ÎșB activation.
Pregnancy: Category C (US FDA). Animal studies show fetal harm. Not recommended during pregnancy due to lack of adequate human data. Use only if potential benefit justifies potential risk.
Driving: May cause drowsiness or dizziness in some individuals. Caution advised when driving or operating machinery.
| Warfarin/Acenocoumarol | May potentiate anticoagulant effect, increasing INR and bleeding risk. | Major |
| Antidiabetic Drugs (Insulin, Metformin, Sulfonylureas) | Theoretical risk of reducing efficacy; may increase insulin resistance. Monitor blood glucose closely. | Moderate |
| Chemotherapy (e.g., Doxorubicin, Etoposide) | May reduce the effectiveness of certain chemotherapeutic agents. | Moderate |
| Acetaminophen (Paracetamol) | Possible reduced efficacy of glucosamine; separate administration by a few hours. | Minor |
| Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) | Additive therapeutic effect for pain relief. No major pharmacokinetic interaction. | Minor |
Same composition (Glucosamine (NA)), different brands: