Gouri

Clinical Monograph: Gouri (Liquid Polycaprolactone 21%)

1. Classification and Chemical Overview

• Active Composition: Polycaprolactone (PCL) at a concentration of 21% formulated in a completely solubilized liquid state. Unlike traditional PCL or PLLA biostimulators that require reconstitution from powders or suspensions containing solid microparticles, Gouri is entirely particle-free.

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• Therapeutic Class: Liquid biostimulator / Dermal collagen-regenerative agent.

• Regulatory Status: Professional-use medical device (holding European CE mark and Korean MFDS approval, indicated for the temporary improvement of facial fine lines), administered exclusively by trained medical or aesthetic professionals.

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2. Mechanism of Action and Pharmacodynamics

• Fibroblast Stimulation & Neocollagenesis: Once injected into the dermal or subdermal plane, the solubilized liquid PCL naturally disperses through the tissue matrix. It continuously stimulates dermal fibroblasts, prompting the physiological synthesis of native collagen (Type I and III) that has diminished due to intrinsic aging.

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• Uniform Diffusion & Reduced Nodule Risk: Because the formulation lacks solid microparticles or suspending gels, it eliminates the primary catalyst for clumping. This allows for seamless, homogeneous spreading across broader anatomical zones and significantly lowers the incidence of localized papules, lumps, or granulomas.

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3. Approved Clinical Indications and Dosing Scope

• Indications:

  • Rejuvenation of photo-aged, lax, or thinning skin across the entire face.

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  • Softening of fine lines, wrinkles, and dynamic folds (such as periocular lines).

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  • Improvement of overall skin elasticity, tone, and dermal density.

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• Dosing Regimen & Application Protocol:

  • Typically administered via specialized multi-point injection techniques (e.g., a standardized 10-point protocol across the face) into the dermal or subdermal layer.

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  • Standard therapeutic courses generally involve 3 sessions spaced 4 weeks apart, followed by maintenance treatments every 3 to 6 months to sustain collagen regeneration.

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4. Pharmacokinetic Profile

• Tissue Integration: The liquid polymer integrates smoothly into the extracellular architecture without creating localized volumetric displacement or high-pressure focal bumps.

• Biodegradation: PCL is a biocompatible, biodegradable polymer that is slowly and predictably degraded over several months (typically 6 to 12 months) via non-enzymatic ester hydrolysis into harmless byproducts (carbon dioxide and water), leaving behind the newly synthesized native collagen network.

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5. Physiological Effects and Adverse Event Spectrum

Gouri triggers a sustained regenerative cellular response, accompanied by mild, transient local injection reactions.

Adverse Reaction Profile

• Common ($\ge 1/100$ to $<1/10$): Transient injection site discomfort, localized erythema, mild swelling, pinpoint bruising, and tenderness.

• Uncommon ($\ge 1/1,000$ to $<1/100$): Mild localized pruritus or short-lived edema resolving spontaneously within a few days.

• Rare / Severe (<1/1,000): Delayed hypersensitivity, localized inflammatory reactions, or secondary infection related to barrier compromise. Due to the particle-free liquid design, the risk profile for palpable subcutaneous nodule formation is substantially lower than that of particulate biostimulators.

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6. Contraindications, Drug Interactions, and Clinical Precautions

Controindicazioni

• Known hypersensitivity to polycaprolactone or any formulation excipients.

• Active skin infections, inflammatory dermatoses (such as severe acne or eczema), or open lesions at the treatment site.

• History of systemic autoimmune disorders, bleeding disorders, or severe scarring tendencies (keloids).

• Pregnancy and breastfeeding.

Key Interacting Factors & Warnings

• Non-Dissolvable Nature: Like other PCL-based formulations, liquid PCL cannot be enzymatically dissolved (unlike hyaluronic acid); however, its uniform, particle-free diffusion minimizes the risks associated with localized hypercorrection or nodular clumping.

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• Aseptic Technique: Must be handled strictly under aseptic clinical conditions using single-use sterile components.

Clinical Precautions and Post-Treatment Guidelines

• Post-Care Management: Instruct patients to avoid excessive heat exposure (e.g., saunas, heavy sunbathing), strenuous physical exercise, and alcohol consumption for 24 to 48 hours post-injection to minimize prolonged flushing or edema.