4-Amino-3-phenylbutyric acid HCl is primarily utilized in pharmaceutical research and development as a key intermediate in the synthesis of various bioactive compounds. Its structure makes it valuable for creating molecules with potential therapeutic applications, particularly in the design of drugs targeting neurological disorders. The compound is often employed in the production of GABA analogs, which are used to treat conditions like epilepsy, anxiety, and chronic pain. Additionally, it serves as a building block in organic synthesis for developing novel compounds with potential pharmacological properties. Its role in medicinal chemistry highlights its importance in advancing drug discovery and development efforts.