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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. Exogenous HA preparations are used for joint lubrication and intraocular surgery.
## Primary Indications
* **Intra-articular injection:** Osteoarthritis (OA) of the knee.
* **Ophthalmic surgery:** Viscoelastic agent for intraocular lens implantation, cataract surgery, and corneal transplantation.
## Adult Dosing
* **Osteoarthritis of the knee:**
* Typically administered as a series of intra-articular injections.
* Common regimens include:
* 60 mg (6 mL of 1% solution) once weekly for 3 weeks.
* 20 mg (2 mL of 1% solution) once weekly for 5 weeks.
* Some products may allow for a single 60 mg (6 mL of 1% solution) injection.
* Maximum dose: Varies by product and regimen. Consult specific product labeling.
* **Ophthalmic surgery:**
* Administered intraocularly by a surgeon.
* Dosing is product-dependent and based on surgical needs.
## Pediatric Dosing
* **Osteoarthritis of the knee:** Safety and efficacy in pediatric patients have not been established.
* **Ophthalmic surgery:** Use in pediatric patients should be guided by surgeon expertise and specific product indications.
## Dose Adjustments
* No dose adjustments are typically required for hepatic or renal impairment due to minimal systemic absorption.
## Contraindications
* Known hypersensitivity to hyaluronic acid or any component of the formulation.
* Active infection at or near the injection site.
* Skin disinfection must be adequate.
## Adverse Effects
* **Intra-articular injection:** Pain, swelling, stiffness, or warmth at the injection site. Pseudoseptic reactions are rare but possible.
* **Ophthalmic surgery:** Transient increase in intraocular pressure, inflammation, corneal edema, cystoid macular edema (rare).
## Key Drug Interactions
* **Intra-articular:** Concurrent administration with local anesthetics may increase the risk of systemic toxicity; however, HA is often mixed with lidocaine for injection. Avoid concurrent use with quaternary ammonium compounds (e.g., benzalkonium chloride) in ophthalmic preparations as they can inactivate HA.
* No significant systemic drug interactions are expected due to minimal systemic absorption.
## Monitoring
* **Intra-articular injection:** Monitor for signs and symptoms of infection or allergic reaction at the injection site.
* **Ophthalmic surgery:** Postoperative intraocular pressure, inflammation, and visual acuity.
## Clinical Pearls
* HA for osteoarthritis is a viscosupplement, not a cure. Relief of symptoms may take several weeks.
* Multiple injection series and single injection formulations exist.
* Adequate skin preparation is crucial before intra-articular injection to prevent infection.
* Discard any unused portion of a single-use vial.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and local institutional protocols for definitive guidance.*
