Lidocaine transdermal patches are a localized treatment option for managing postherpetic neuralgia (PHN) pain, a persistent nerve pain following shingles. The patches deliver lidocaine directly to the affected area, blocking pain signals by numbing the skin. They are applied to intact skin over the most painful region, with up to three patches used for up to 12 hours daily. The patches can be cut to size, and clothing can be worn over them. Special precautions include avoiding water exposure during use and ensuring safe disposal. This method provides targeted relief with minimal systemic side effects, making it suitable for long-term PHN management.
Key Points Explained:
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Purpose and Mechanism
- The Lidocaine Transdermal Patch is designed to alleviate PHN pain by blocking sodium channels in nerve endings, preventing pain signal transmission.
- It acts locally, minimizing systemic absorption and side effects compared to oral medications.
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Application Guidelines
- Dosage: Use a 5% or 1.8% patch on intact skin over the most painful area. Up to three patches can be applied simultaneously.
- Duration: Patches should remain on for up to 12 hours within a 24-hour period. For some formulations (e.g., 4%), 8–12 hours is recommended.
- Customization: Patches can be cut to fit smaller areas, especially for debilitated patients or those with impaired elimination.
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Practical Considerations
- Clothing: Normal clothing can be worn over the patch.
- Water Exposure: Avoid bathing, swimming, or showering during the 12-hour application to prevent patch displacement.
- Heat: External heat sources (e.g., heating pads) should not be applied directly to the patch, as this increases lidocaine absorption. Moderate heat exposure (15 minutes) is acceptable.
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Safety and Disposal
- Handling: Wash hands after application to avoid accidental eye contact or ingestion.
- Disposal: Fold used patches so the adhesive sticks to itself and discard safely, away from children and pets.
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Special Populations
- Children: Consult a pediatrician before use; nonprescription patches are approved for ages 12+.
- Debilitated Patients: Smaller treatment areas are advised to reduce systemic exposure.
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Effectiveness for PHN
- The patch targets PHN symptoms like burning or stabbing pain, offering sustained relief without the need for frequent reapplication.
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Contraindications
- Avoid sharing patches and using them on broken skin. Monitor for localized reactions (e.g., redness, swelling).
By following these guidelines, patients can safely and effectively manage PHN pain with minimal disruption to daily activities. The patch’s localized action makes it a preferred option for long-term nerve pain relief.
Summary Table:
| Key Aspect | Details |
|---|---|
| Purpose | Blocks nerve pain signals locally with minimal systemic absorption. |
| Application | Apply up to three 5% or 1.8% patches on intact skin for 12 hours daily. |
| Customization | Can be cut to fit smaller areas for debilitated patients. |
| Safety | Avoid water exposure, heat sources, and use on broken skin. |
| Effectiveness | Provides sustained relief for PHN symptoms like burning or stabbing pain. |
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