Post-herpetic neuralgia (PHN) is a painful condition that can happen after having herpes zoster, also known as shingles. It's caused by the reactivation of the chickenpox virus. This study is comparing two medications, called Pregabalin and Lacosamide, to see which works better for PHN pain. PHN can make it hard to sleep and do everyday activities.

Key Points:

• The study lasts for a specific period, but details on the exact length and number of visits are not provided here.
• Participants must be between the ages of 18 and 50 and have been diagnosed with PHN.
• You cannot join if you are already taking pain medication for PHN or have other illnesses.

If you are eligible and interested, this study could provide important information about the treatment of PHN. Remember, your participation is voluntary, and you can leave the study at any time.