A patient with diabetic peripheral neuropathy on pregabalin for 4 days shows improvement. Which finding indicates effectiveness?

• A. Reduced level of pain
• B. Increased numbness
• C. Drowsiness
• D. Headache

Answer: (A)

In treating neuropathic pain from diabetic peripheral neuropathy with pregabalin, effectiveness is shown by a reduction in pain intensity. Pregabalin works by modulating calcium channel activity in the central nervous system, which decreases the release of neurotransmitters that amplify pain signals. This leads to less perceived pain and greater pain relief for the patient. Numbness may persist because it reflects nerve damage rather than current pain signaling, so its increase or persistence isn’t a sign of improvement. Drowsiness and headaches are common side effects and do not indicate that the medication is working to relieve pain. Therefore, the best indicator of effectiveness is a decreased level of pain.