Prothiadin is primarily used to treat moderate to severe depression, improving mood and alleviating the psychological symptoms associated with this condition. It is also used to treat chronic anxiety, reducing nervous tension and promoting psychological well-being, making it an option for some cases of a combination of depression and anxiety. This medication is also sometimes given to treat sleep disorders resulting from anxiety or depression, as it has a calming effect that helps patients improve their sleep quality. Prothiadin should be used under close medical supervision due to the possibility of side effects or drug interactions with other medications.