Pharmacokinetic Study to Compare the Systemic Exposure of Differin® Gel, 0.3% or Differin® Gel, 0.1%

A Pharmacokinetic Study to Compare the Systemic Exposure to Adapalene During Dermal Application of Either Differin® Gel, 0.3% (Adapalene 0.3%) or Differin® Gel, 0.1% (Adapalene 0.1%) for 30 Days in Subjects With Acne Vulgaris

Phase 4 commitment pharmacokinetic study to determine systemic exposure to adapalene.

Study Overview

• Status: Completed
• Conditions: Acne Vulgaris
• Intervention / Treatment: Drug: Adapalene; Drug: Adapalene

Detailed Description

Multi-center, double-blind, randomized, parallel group study enrolling male or female subjects with acne vulgaris.

Screening will take place within 14 days prior to Baseline. At the Baseline visit, and at each study day up to Day 30, a trained nurse or technician will apply 2 grams of study medication (either Differin® Gel, 0.3% or Differin® Gel, 0.1%) to the face, upper part of chest, and upper part of back of the subjects. To ensure maximal usage conditions, 2 grams study medication will be applied once daily to a total body surface area of approximately 1000 cm², which is equivalent to 2 mg/cm2.

Subjects will arrive at the clinic the night before on visit days (Day 1, Day 15 and Day 30) when PK blood samples will be drawn. Subjects will be discharged from the clinic on Day 2 and Day 16 following the 24-hour post-dose blood sample, and on Day 31 after the 36-hour post-dose blood samples.

Cutaneous safety (local tolerability assessments) will be assessed, by recording erythema, scaling, dryness, and stinging/burning sensation as separate scores on the face, upper part of the chest, and upper part of the back using a 4-point scale (0 = None to 3 = Severe). Local tolerability assessments will be performed weekly on Day 1, 8, 15, 22 and Day 30, prior application of study medication.

Efficacy will be evaluated by Inflammatory and Non-inflammatory lesion counts on the face performed at Screening, Baseline (Day 1), and on Day 30.

Subjects will have routine laboratory tests (fasting hematology, blood chemistry) performed at Screening and at Day 30 visits.

Blood samples for determination of adapalene plasma concentrations will be drawn on Day 1, Day 15, and Day 30 before the morning study medication application (pre-dose) and 1, 2, 4, 6, 8, 10, 12, 16 and 24 hours after application of study medication; and additionally after the last study medication application (Day 31, 32, 33) at 32, 36, 48 and 72 hours post-dose.

The adapalene plasma concentrations will be determined by a high performance liquid chromatography (HPLC) and fluorescence detection method.

• Study Type: Interventional
• Enrollment (Actual): 51
• Phase: Phase 4

Contacts and Locations

Study Locations

• United States
  • Texas
    • Austin, Texas, United States, 78759
      • Dermresearch, Inc.
    • College Station, Texas, United States, 77845
      • J&S Studies, Inc.

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 35 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Male or female 18 to 35 years of age
• Clinical diagnosis of acne vulgaris
• Minimum of 20 Inflammatory
• Minimum of 20 Non-inflammatory lesions
• The subject has a body weight between 45 and 100 kg, and a Body Mass Index (BMI) between 18 and 30Kg/m2

Exclusion Criteria:

• More than 1 nodule or any cyst on the face (excluding the nose)
• Acne conglobata, acne fulminans, secondary acne or severe acne
• Underlying diseases or other dermatological conditions that require the use of interfering topical or systemic therapy
• Pregnant or nursing or planning a pregnancy
• Surgical or medical condition which might interfere with the absorption, distribution, metabolism, or excretion of the drug
• Known allergies to any of the ingredients of the study medication
• History of alcohol or drug abuse or positive test results for any drug abuse
• Positive test results for hepatitis B surface antigen (HBs-Ag), hepatitis C virus (HCV) or human immunodeficiency virus antibodies (HIV Ab)
• Use of prohibited medications prior to the study unless appropriate washout period is documented

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Differin® Gel, 0.3%; Gel, 0.3%, 2g, once daily for 30 days	Drug: Adapalene; Gel, 0.3%, 2g, once daily for 30 days; Drug: Adapalene; Gel, 0.1%, 2g, once daily for 30 days
Active Comparator: Differin® Gel, 0.1%; Gel, 0.1%, 2g, once daily for 30 days	Drug: Adapalene; Gel, 0.3%, 2g, once daily for 30 days; Drug: Adapalene; Gel, 0.1%, 2g, once daily for 30 days

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Cmax (ng/mL) at Day 1	the observed peak drug (adapalene) concentration	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Cmax (ng/mL) at Day 15	the observed peak drug (adapalene) concentration	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Cmax (ng/mL) at Day 30	the observed peak drug (adapalene) concentration	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr, T32hr, T36hr, T48hr, T 72hr (post dose)
Tmax (hr) at Day 1	the time at which Cmax occurs	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Tmax (hr) at Day 15	the time at which Cmax occurs	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Tmax (hr) at Day 30	the time at which Cmax occurs	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr, T32hr, T36hr, T48hr, T72hr (post dose)
Area Under the Plasma Concentration Versus Time Curve for 0 to 24 Hours Post Dose Measured on Day 1 (AUC (0-24))	area under the concentration-time curve calculated mixed linear-logarithmic trapezoidal method from pre-application (T0) through 24 hr (corresponding to the dosing interval)	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Area Under the Plasma Concentration Versus Time Curve for 0 to 24 Hours Post Dose Measured on Day 15 (AUC (0-24))	area under the concentration-time curve calculated mixed linear-logarithmic trapezoidal method from pre-application (T0) through 24hr (corresponding to the dosing interval)	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr (post dose)
Area Under the Plasma Concentration Versus Time Curve for 0 to 24 Hours Post Dose Measured on Day 30 (AUC (0-24))	area under the concentration-time curve calculated mixed linear-logarithmic trapezoidal method from pre-application (T0) through 24hr (corresponding to the dosing interval)	T0 (predose), T1hour (hr), T2hr, T4hr, T6 hr, T8 hr, T10hr, T12hr, T16hr, T24hr, T32hr, T36hr, T48hr, T72hr (post dose)

Collaborators and Investigators

• Sponsor: Galderma R&D

Study record dates

Study Major Dates

• Study Start: May 1, 2008
• Primary Completion (Actual): August 1, 2008
• Study Completion (Actual): November 1, 2008

Study Registration Dates

• First Submitted: April 15, 2008
• First Submitted That Met QC Criteria: April 15, 2008
• First Posted (Estimate): April 18, 2008

Study Record Updates

• Last Update Posted (Actual): February 18, 2021
• Last Update Submitted That Met QC Criteria: February 16, 2021
• Last Verified: January 1, 2011

More Information

Terms related to this study

• Keywords: Acne vulgaris; Adapalene; Differin
• Additional Relevant MeSH Terms: Skin Diseases; Acneiform Eruptions; Sebaceous Gland Diseases; Acne Vulgaris; Physiological Effects of Drugs; Peripheral Nervous System Agents; Analgesics; Sensory System Agents; Anti-Inflammatory Agents, Non-Steroidal; Analgesics, Non-Narcotic; Anti-Inflammatory Agents; Antirheumatic Agents; Dermatologic Agents; Adapalene
• Other Study ID Numbers: RD.06.SPR.18115