5% Lidocaine-medicated Plaster for the Treatment of Trigeminal Neuralgia

Summary

Trigeminal neuralgia (TN) is characterized by sudden, severe, usually unilateral, transient, stinging, recurrent electrocute-like shock in one or more divisions of the trigeminal nerve, lasting from a few seconds to less than 2 minutes.Simple daily-life activities, such as washing the face, brushing the teeth, eating, and talking, or the slight touch of trigger points may trigger the attack of pain of TN, resulting in a decline in the patient's quality of life (QoL). Trigger zones predominantly locate in the perioral and nasal region. Paroxysmal pain is associated with triggers in virtually all patients with TN. TN may be caused by abnormality of the trigger zone and the blockade of Na+ channel of trigger zone may be a novel and effective treatment methods for TN. Currently, most patients with TN may not achieve adequate pain relief with a single therapeutic agent. Multiple analgesics targeting different mechanisms of the pain pathway are often used.5% lidocaine medicated plaster (LMP) is a white hydrogel plaster containing adhesive material. LMP was approved for post-herpetic neuralgia (PHN) treatment by the United States Food and Drug Administration (FDA) in 1999. Tamburin et al reported that 2 patients with primary TN who stopped oral drugs because of side effects or refused surgical procedures. Both patients were instructed to wear LMP over the affected area and LMP resulted in reduction of pain intensity and the number of pain paroxysms without side effects. However, due to limitations of these open-label design studies, the observed reductions in pain intensity may have been due to treatment effect, placebo effect, changes in underlying disease state, or a combination of these factors. Therefore, randomized controlled trials will be need to be performed to draw about the efficacy of the LMP in TN.

The PATCH trial is a prospective, double-blinded, vehicle-controlled, parallel-group, multicenter, enriched enrolment with randomized withdrawal (EERW) trial aimed at estimating the efficacy and safety of LMP in patients with TN. After providing informed consent and completing a baseline evaluation, patients will participate in an initial open-label treatment period of LMP (active patches). This openly titrated process is close to clinical practice and can provide data on the proportion of responders and non-responders, the optimal dose of the analgesic drug, and the proportion of withdrawal due to adverse effects. A responder at the end of the open-label treatment phase will be included in the subsequently double-blind treatment phase.

Conditions

• Trigeminal Neuralgia

Interventions

DRUG

5% lidocaine medicated plaster

The 5% lidocaine medicated plaster is measuring 10 cm x 14 cm contains 700 mg lidocaine (5% w/w) For each patient, the painful area and the trigger point will be chosen for treatment. The investigator will instruct the patient to replace the patch every 12 hours. The patches could be applied during the night (application in the evening and removal in the morning), or during the day. Patients will be told to apply up to three patches at one time.

DRUG

vehicle plaster

Vehicle patches are identical to the active patch, except for the absence of lidocaine, without any optical differences.For each patient, the painful area and the trigger point will be chosen for treatment. The investigator will instruct the patient to replace the patch every 12 hours. The patches could be applied during the night (application in the evening and removal in the morning), or during the day. Patients will be told to apply up to three patches at one time.

Sponsors & Collaborators

• Beijing Tiantan Hospital

  lead OTHER

Principal Investigators

• Fang Luo · Beijing Tiantan Hospital

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

TRIPLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

80 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2021-05-01

Primary Completion

2022-08-26

Completion

2022-08-26

Countries

• China

Study Locations