Key takeaways
Diclofenac patch (Flector) and lidocaine 5% patch (Lidoderm) are both topical medications used to relieve pain, but they belong to different medication classes. Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) that treats pain and inflammation from minor strains, sprains, and bruises. Lidocaine is a local anesthetic used to relieve nerve pain from shingles, known as postherpetic neuralgia. Diclofenac patches are applied once or twice daily, depending on the brand, while lidocaine patches are applied once daily for up to 12 hours. Common side effects of diclofenac include skin reactions and digestive issues, while lidocaine may cause skin irritation and, rarely, methemoglobinemia, a serious blood condition. Diclofenac should not be used with oral NSAIDs due to increased bleeding risk, but this isn't an issue with lidocaine patches.
