Topical Pilocarpine Formulation for Diagnosis of Cystic Fibrosis

Area of Science:

• Pharmacology
• Dermatology
• Biochemistry

Background:

• Cystic fibrosis diagnosis relies on sweat chloride levels, typically measured using pilocarpine-induced iontophoresis.
• The conventional iontophoresis method is invasive and linked to adverse skin reactions.
• There is a need for improved pilocarpine delivery methods for diagnostic sweat induction.

Purpose of the Study:

• To develop and evaluate a novel topical formulation for pilocarpine delivery.
• To compare the in vitro drug delivery of the topical formulation against pilocarpine iontophoresis.
• To assess the clinical efficacy of the topical formulation in inducing sweat production.

Main Methods:

• A topical pilocarpine formulation was developed.
• In vitro drug delivery was assessed using a porcine skin model, comparing the topical formulation with iontophoresis.
• Clinical evaluation involved measuring sweat secretion after topical formulation application.

Main Results:

• The topical formulation demonstrated superior in vitro pilocarpine delivery compared to iontophoresis (152.04 ± 52.23 μg/cm² vs. 97.05 ± 27.93 μg/cm² after 10 minutes).
• Clinical studies confirmed the topical formulation's ability to induce significant sweat secretion (77.28 ± 18.97 mg).

Conclusions:

• The developed topical formulation successfully delivers pilocarpine through the skin.
• This formulation provides a viable and potentially safer alternative for pilocarpine-induced sweat testing for cystic fibrosis diagnosis.