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# Hyaluronic Acid ## Overview Hyaluronic acid (HA) is a naturally occurring glycosaminoglycan found in various connective tissues, synovial fluid, and ocular tissues. It acts as a lubricant and shock absorber. Formulations vary significantly by indication and route of administration. ## Primary Indications * **Intra-articular injection:** Osteoarthritis of the knee. * **Ophthalmic surgery:** Viscosurgical device for anterior chamber maintenance, lens insertion, and wound protection. * **Topical/Intranasal:** Moisturizing agent for dry skin and nasal passages. ## Adult Dosing * **Osteoarthritis of the Knee:** * **Synovial joint injection:** Typically 20 mg (2 mL) administered intra-articularly once weekly for 3 weeks. Some preparations allow for a single injection of 60 mg (6 mL). * *Maximum:* Follow specific product labeling. * **Ophthalmic Surgery:** * **Intraocular injection:** Varies by product and surgical technique. Typically 0.5 mL to 2.0 mL injected into the anterior chamber. Refer to specific product labeling for guidance. ## Pediatric Dosing No established pediatric dosing for intra-articular or ophthalmic indications. Use in children is generally not recommended or based on limited case reports/expert opinion. ## Dose Adjustments No dose adjustments are typically required for hepatic or renal impairment. ## Contraindications * Hypersensitivity to hyaluronic acid or any component of the formulation. * Active joint infection or skin infection over the injection site. * Severe synovitis. ## Adverse Effects * **Intra-articular:** Local pain, swelling, stiffness, transient effusion at the injection site. Arthrodesis, joint infection (rare). * **Ophthalmic:** Postoperative inflammation, transient intraocular pressure elevation, corneal edema, hyphema. * **Topical/Intranasal:** Mild local irritation. ## Key Drug Interactions No significant drug interactions are established for intra-articular or ophthalmic preparations. Concurrent use with topical antiseptics containing quaternary ammonium salts should be avoided if they are incompatible with hyaluronic acid. ## Monitoring * **Intra-articular:** Assess for signs of infection (redness, warmth, increased pain, fever) or allergic reaction. Monitor for pain and functional improvement. * **Ophthalmic:** Monitor intraocular pressure postoperatively. ## Clinical Pearls * Hyaluronic acid preparations for osteoarthritis aim to supplement synovial fluid, improving lubrication and shock absorption. Efficacy can vary. * For ophthalmic use, HA acts as a viscoelastic agent, protecting ocular tissues and facilitating surgical maneuvers. * Allow adequate time between doses as recommended by the manufacturer. * Avoid weight-bearing activities and strenuous exercise for 48 hours after intra-articular injection. *** *This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before making any clinical decisions. This is not a substitute for professional medical advice.*