Alpha-2-delta ligands: gabapentin, gabapentin enacarbil, and pregabalin

"Alpha-2-delta ligand" is the name for a group of medications that has become a first-line choice for restless legs: gabapentin, gabapentin enacarbil, and pregabalin. Unlike the dopamine agonists, they are not associated with augmentation, which is part of why the 2024 guideline points toward them.

How they differ

• Gabapentin is the oldest and most widely available. How well the body absorbs it can vary from person to person.
• Gabapentin enacarbil is a form designed for steadier absorption, and is specifically approved for RLS in the US.
• Pregabalin is absorbed more consistently and tends to act more predictably.

Which one fits depends on your body, your other conditions, insurance coverage, and cost. This page does not cover dosing, which is between you and your doctor.

Common side effects

The most common early effects are drowsiness and some unsteadiness, which often settle over the first weeks. Because these are usually taken in the evening for RLS, the drowsiness can line up with bedtime. Some people notice mild swelling or weight changes over time. The balance of benefit and side effect is individual.

Stopping

These medications should not be stopped abruptly either. If one is not working out, that is a reason to talk to your doctor about how to change course, not to quit on your own.