グルコサミン / コンドロイチン硫酸
グルコサミンとコンドロイチン硫酸は、主に犬、猫、馬の**変形性関節症**やその他の痛みを伴う関節疾患の補助治療として広く使用されている**ニュートラシューティカル（栄養補助食品）**です。また、尿路の保護層にグリコサミノグリカンが含まれているため、**猫下部尿路疾患（FLUTD）**の猫の膀胱の健康をサポートするためにも時折使用されます。 > **臨床のポイント：** これらの製品は医薬品としてFDAの規制を受けていないため、メーカーによって製品の品質、純度、バイオアベイラビリティが大きく異なる場合があります。独立した品質テストや臨床試験を経た信頼できる動物用医薬品メーカーの製品（例：Cosequin®）を使用することを強くお勧めします。 臨床的な有効性については議論があり、大規模で決定的な研究は不足していますが、これらのサプリメントは一般的に非常に安全であると考えられており、関節の健康と慢性疼痛管理のマルチモーダルアプローチの一部として頻繁に使用されています。
作用機序: These compounds work synergistically to support cartilage matrix synthesis and inhibit cartilage degradation: * **Glucosamine:** Acts as a primary building block for cartilage. Chondrocytes utilize glucosamine to synthesize **glycosaminoglycans (GAGs)** and **hyaluronan**. It also regulates the synthesis of collagen and proteoglycans and exhibits mild anti-inflammatory properties by scavenging free radicals. * **Chondroitin Sulfate:** Provides structural integrity to cartilage. It actively **inhibits destructive enzymes** (such as metalloproteinases) in joint fluid and cartilage. It also stimulates the production of GAGs and proteoglycans, and may reduce thrombi formation in the microvasculature of the joint. **Pathway:** Exogenous Glucosamine + Chondroitin → Uptake by Chondrocytes → ↑ GAG & Hyaluronan Synthesis + ↓ Cartilage Degrading Enzymes → Improved Joint Fluid Viscosity & Cartilage Health.
動物種別の用量
- Adjunctive treatment of cancer pain · 15-30 mg/kg (of the chondroitin component) PO once daily (q24h) for 4-6 weeks then half the dose · PO · q24h · 4-6 weeks then half dose
- Adjunctive treatment of chronic pain · 15-20 mg/kg (of the chondroitin component) PO once daily or every other day (q24-48h) · PO · q24-48h
- Dietary Supplement (Cosequin For Cats) · Initially: under 10 lb.: 1 capsule sprinkled on food daily; over 10 lb.: 2 capsules sprinkled on food daily (1 in AM/1 in PM). Maintenance Administration (after initial 4-6 week period): once desired response is obtained, capsules may be administered every other day. · PO · q24h or divided · Initial 4-6 weeks, then maintenance
- Navicular syndrome · 16.5 grams (5 scoops) in feed twice daily · PO · q12h · Using Cosequin Concentrated Powder
- Dietary Supplement (Cosequin Concentrated Powder) · Initially: for horses under 600 lb., 2 scoops in AM and 2 scoops in PM; horses 600-1,200 lb., 3 scoops in AM and 3 scoops in PM; horses over 1,200 lb., 4 scoops in AM and 4 scoops in PM. Suggested Maintenance Administration: horses under 600 lb., 1 scoop daily; horses 600-1,200 lb., 1-2 scoops daily; horses over 1,200 lb., 2 scoops daily. · PO · Divided AM/PM · Initial 2-4 weeks, then maintenance · Transition Period: Do not lower amount until horse has begun to respond. Reduce total daily amount by one level scoop each week.
- Adjunctive treatment of chronic pain · 13-15 mg/kg (of the chondroitin component) PO once daily (q24h) · PO · q24h
投与経路
禁忌
- Known hypersensitivity to glucosamine or chondroitin
有害事象
- Mild gastrointestinal upset
- Flatulence
- Stool softening or mild diarrhea
- Hypersensitivity reactions (rare, as products are derived from natural sources)
薬物相互作用
- Doxorubicin · Glucosamine may induce resistance to this agent by reducing its inhibition of topoisomerase II.
- Etoposide · Glucosamine may induce resistance to this agent by reducing its inhibition of topoisomerase II.
- Warfarin · High doses of chondroitin/glucosamine may enhance coagulation effects and theoretically increase the International Normalized Ratio (INR).
- Heparin · High doses potentially could enhance the effects of heparin or other drugs that affect coagulation.
モニタリング
- Clinical efficacy (improvement in mobility, reduction in pain, or improvement in urinary signs for FLUTD)
過量投与
Oral overdosage is highly unlikely to cause significant systemic problems. The LD50 for the combined compound in rats is greater than 5 g/kg. * **Clinical Signs:** Massive ingestions may result in gastrointestinal effects (vomiting, diarrhea). Theoretical changes in coagulation parameters could occur but have not been documented. * **Toxicity Note:** Products containing manganese could lead to manganese toxicity if given in very high dosages chronically above label recommendations.
VetSheet の薬剤リファレンスは、獣医療従事者向けの臨床意思決定支援を目的としており、専門的判断やメーカーの最新添付文書に代わるものではありません。