HDAC inhibitors are used to treat certain types of cancer, including cutaneous T-cell lymphoma and peripheral T-cell lymphoma. They also have other uses, such as treating Duchenne muscular dystrophy. HDAC inhibitors work by blocking histone deacetylases, which can help stop the growth of cancer cells, among other things. These medications come in different forms, including oral pills, liquids, and injections. Examples include Beleodaq (belinostat), Istodax (romidepsin), and Zolinza (vorinostat).