Glycine-proline-glutamate analogs are used to treat Rett syndrome, a rare genetic neurological disorder. These medications work by mimicking the effects of certain amino acids in the brain, which is thought to help improve symptoms. An example of a glycine-proline-glutamate analog is Daybue (trofinetide), which is available as an oral solution. This medication can help manage symptoms and improve the quality of life for those with Rett syndrome.