Used primarily in the treatment of tuberculosis, especially multidrug-resistant strains, as a second-line antibiotic. It works by interfering with bacterial cell wall synthesis. Also investigated for its role in enhancing cognitive function and improving outcomes in certain psychiatric disorders, such as anxiety and schizophrenia, due to its action on NMDA receptors in the brain. Shows potential as an adjunct in exposure-based therapies for phobias and post-traumatic stress disorder by promoting neural plasticity.