Hopantenic acid (homopantothenic acid), also known as N-pantoyl-GABA, is a central nervous system depressant. Formulated as the calcium salt, it is used as a pharmaceutical drug in the Russian Federation for a variety of neurological, psychological and psychiatric conditions and sold as Pantogam ().
Hopantenic acid is a homologue of pantothenic acid. While pantothenic acid is the amide of <small>D</small>-pantoate and ò-alanine, hopantenic acid is the amide of <small>D</small>-pantoate and ó-aminobutyric acid (GABA). This change leads to an additional CH<sub>2</sub> in the molecule.