An NHS programme of services to treat adults with enduring or complex mental health problems such as post-traumatic stress disorder (PTSD). IPTS uses psychological therapies such as cognitive behavioural therapy (CBT), dialectical behaviour therapy (DBT), group therapies, and other NICE-approved therapies delivered by qualified mental health practitioners such as psychologists. Access to IPTS usually requires a referral from a GP or community mental health team (CMHT).