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Moumoujus

PRAMOXINE HCL.

Valuable CAS 637-58-1 / ANTIOXIDANT

Pramoxine HCl is an FDA-approved topical anesthetic ingredient that provides temporary relief from pain and itching. It effectively desensitizes local skin and mucous membranes, making it a valuable asset for managing various skin irritations and pruritic conditions.

Summary

skin-soothing local anesthetic

Science

Mechanism of Action

Pramoxine HCl functions as a local anesthetic by stabilizing the neuronal membranes within skin nerve endings. This action inhibits the influx of sodium ions, thereby blocking the initiation and conduction of nerve impulses, which leads to temporary desensitization. Additionally, it can form a protective coating over inflamed tissues to prevent excessive drying.

Research

Clinical Evidence

High confidence
Effective range 1–1%
Optimal

1%

Key findings

  1. 01 A 1% concentration significantly reduced pruritus in 57% of patients in a major clinical trial, with creams outperforming gel formulations. This concentration also lowered the Visual Analog Scale (VAS) for itching by 61% in individuals with uremic pruritus.
  2. 02 When combined with 2.5% hydrocortisone acetate, a 1% pramoxine HCl formulation achieved a mean pruritus reduction of 31.74% within a single day of use.
  3. 03 Formulations incorporating lactic acid with pramoxine HCl demonstrated substantial improvements in skin hydration and relief for dry, itchy skin.
  4. 04 In atopic dermatitis, pramoxine HCl formulations with ceramide provided comparable itch relief to those containing ceramide and hydrocortisone, showing a 24.6% reduction in mean itch severity at 2 minutes and a 58% reduction at 8 hours.

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

As an FDA-approved OTC topical anesthetic with a clearly established effective concentration of 1% and a maximum allowed concentration of 1%, Pramoxine HCl is not typically 'dusted'. Formulations generally adhere to the pharmacologically active dosage to ensure efficacy, with concentrations below 1% (e.g., 0.5%) being a potential red flag for insufficient therapeutic effect.

The Formula

Formulation

Solubility
Both
Optimal pH 3.5 – 4.5
0 7 14

Stability

Pramoxine HCl maintains stability under normal conditions, with an optimal formulation pH range between 3.0 and 5.0, preferably 3.5 to 4.5. Storage at room temperature (20-25°C) is recommended, protecting it from excessive heat and flames, particularly for foam formulations, which should not be refrigerated.

Synergies

  • Hydrocortisone acetate (enhances pruritus reduction)
  • Lactic acid (improves hydration and dry, itchy skin conditions)
  • Ceramides (offers comparable relief in atopic dermatitis)

Conflicts

  • strong acids
  • strong bases
  • strong oxidizing agents

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Moderate

Pramoxine HCl has been FDA-approved for OTC use since 1953 and is generally considered safe and effective when used as directed, with minimal systemic absorption. Potential local reactions include temporary burning or stinging, erythema, or irritation, especially in sensitive individuals. Contact sensitization to pramoxine is a recognized concern, necessitating patch testing for known sensitivities. Avoid application near eyes, nose, deep wounds, blistered skin, severe burns, or large skin areas.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Pramoxine HCl is a highly valuable ingredient for its FDA-approved efficacy in providing rapid, localized relief from pain and itching across a broad spectrum of skin conditions.

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