Urea 40%

Applied topically twice daily (BID) to the affected hyperkeratotic area. Apply a generous layer to clean, dry skin and rub in thoroughly. Urea 40% is typically used on localized areas such as the heels, elbows, knees, nails, or other sites of focal hyperkeratosis. Avoid application to healthy surrounding skin, open wounds, or mucous membranes. Wash hands after application unless hands are the treatment area.

Apply to affected areas twice daily (morning and evening) as directed by the prescriber. For nail dystrophy, the preparation may be applied under occlusion (e.g., with a bandage) to enhance penetration. Treatment duration is determined by the prescribing clinician based on clinical response. Some patients use urea 40% as ongoing maintenance therapy for chronic hyperkeratotic conditions.

• For focal calluses or plantar keratoses: apply BID; manual debridement may be combined as directed
• For nail dystrophy: apply to the nail plate nightly under occlusion
• Assess response at 2–4 week intervals during initial therapy

• Urea (40%): Urea is a naturally occurring nitrogenous compound that at high concentrations (20–40%) exerts keratolytic activity by breaking hydrogen bonds within the keratin filaments of the stratum corneum, dissolving the intracellular matrix, and disrupting the cohesion between corneocytes. This causes softening and separation of hyperkeratotic plaques. At lower concentrations (≤10%), urea acts primarily as a humectant by attracting and retaining water within the stratum corneum. At 40%, it also enhances percutaneous absorption of other topical agents by increasing stratum corneum permeability. In nail disorders, urea disrupts the hard keratin of dystrophic nails, enabling non-surgical nail avulsion and facilitating delivery of antifungal agents.

Urea 40% is indicated for the management of hyperkeratotic skin conditions including ichthyosis, plantar hyperkeratosis, calluses, keratoderma, psoriasis-related scaling, and nail dystrophy (including onychomycosis adjunct therapy). At 40%, it provides sufficient keratolytic activity for moderate-to-severe hyperkeratosis that does not respond to lower-concentration OTC urea products.

Monitoring considerations:

• Assess degree of hyperkeratosis and response at 2–4 week intervals
• Monitor for irritation, burning, or erythema at application sites—reduce frequency if significant irritation occurs
• For patients with diabetes or peripheral vascular disease, exercise caution with foot applications and monitor carefully for skin breakdown
• In nail dystrophy applications, assess nail plate integrity periodically

Contraindications:

• Hypersensitivity to urea or any excipient in the formulation
• Application to open wounds, broken skin, or inflamed/infected skin

Warnings & Precautions:

• Avoid contact with eyes, lips, and mucous membranes
• Do not apply to large surface areas in patients with impaired renal function (urea is renally excreted)
• Use with caution in diabetic patients with peripheral neuropathy or vascular disease—monitor for skin erosion
• Skin irritation may occur, particularly on sensitive skin or with initial use; reduce frequency if irritation is significant

Drug Interactions:

• Urea enhances percutaneous absorption of concurrently applied topical agents; use with caution if combining with potent topical drugs (e.g., topical corticosteroids, antifungals)

Common Side Effects: Mild burning, stinging, or erythema at application site, particularly with initial use; these typically subside with continued therapy.

Store at room temperature (15–25°C); protect from excessive heat and freezing. Keep the container tightly closed to prevent evaporation and contamination. Use within the beyond-use date assigned by Genesis Compounding per 503A regulatory requirements.

What conditions is urea 40% used for?

Urea 40% is used to soften and remove thickened skin in conditions including ichthyosis, plantar calluses, hyperkeratotic psoriasis, keratoderma, and dystrophic or thickened nails. It provides keratolytic action that over-the-counter urea products (10–25%) cannot match.

How is this different from OTC urea lotions?

Over-the-counter urea products are typically 10–25% and work primarily as moisturizers and mild keratolytics. Urea 40% is a prescription-strength keratolytic that actively breaks down thickened keratin and provides substantially more potent softening of hyperkeratotic plaques and nails.

Can I use this on my nails?

Yes. Urea 40% is commonly applied to thickened or dystrophic nails, where it softens the nail plate to facilitate non-surgical debridement or enhance penetration of antifungal agents. Your prescriber will provide specific instructions for nail applications, which may include occlusive dressings.

Is this medication safe for diabetic patients?

Urea 40% can be used in diabetic patients, but with caution. Patients with peripheral neuropathy or vascular disease should have regular clinical monitoring to ensure the skin at application sites remains intact and free of erosion or infection.

Is this FDA-approved?

This is a 503A compounded preparation by Genesis Compounding, prepared under a valid prescriber order. It is not FDA-approved as a compounded drug product.