Lidocaine patches offer a convenient way to manage localized discomfort, delivering medication directly through the skin. They are a common topical solution designed for targeted pain relief.
How Lidocaine Patches Provide Pain Relief
Lidocaine functions as a local anesthetic, temporarily reducing sensation in a specific area. When applied topically, it targets nerve endings in the skin by binding to and blocking voltage-gated sodium channels, which transmit nerve impulses.
By blocking these channels, lidocaine prevents pain signals from traveling along the nerves to the brain. This results in a reversible numbing effect directly at the site of application. The pain-relieving effect typically lasts 8 to 12 hours, minimizing systemic absorption.
Proper Application to the Knee
Applying a lidocaine patch to the knee requires careful preparation to ensure effectiveness and safety. Begin by ensuring the skin around the knee is clean, dry, and free of any cuts, scrapes, or irritation. Applying the patch to compromised skin can increase absorption and potential side effects.
For optimal relief, place the patch directly over the area of most intense pain on the knee. This could be the front, back, or sides of the knee, depending on where the discomfort is concentrated. If the patch is too large for the affected area, some products allow it to be cut with scissors before removing the protective liner. This customization helps ensure the patch adheres well and does not interfere with knee movement.
Adhere to the recommended duration of wear, which is typically 12 hours on and 12 hours off for prescription-strength patches, or up to 8 hours per application for over-the-counter versions. Always remove the old patch before applying a new one to prevent skin irritation. After applying the patch, wash your hands thoroughly with soap and water to remove any residual medication.
Key Safety Considerations
While generally safe for localized pain, using lidocaine patches involves important safety considerations. Common mild side effects at the application site include redness, itching, irritation, or even blistering. These reactions are usually temporary and resolve within minutes to hours after removing the patch. If these effects worsen or persist, it is advisable to consult a healthcare provider.
More serious, though rare, side effects can occur if too much lidocaine is absorbed into the bloodstream. These might include dizziness, lightheadedness, headache, sleepiness, or changes in vision or taste. In rare instances, severe systemic reactions like irregular heartbeats, confusion, tremors, or seizures have been reported. Seek immediate medical attention if any severe or unusual symptoms develop.
It is important to avoid applying heat sources, such as heating pads or electric blankets, directly over a lidocaine patch, as this can increase the rate of lidocaine absorption and potentially lead to toxicity. Furthermore, individuals with known allergies to lidocaine or certain underlying medical conditions should consult a doctor before use. Always follow the specific directions on the product packaging and keep patches out of reach of children and pets, as even used patches contain residual medication that can be harmful if ingested.