Suicide might very well be one of the least studied mental illnesses owing to the ethics and costs involved in recruiting a sample of participants with suicidal thoughts. This has led to a very unfortunate neglect in the development of treatment for suicidal victims.

This article also discusses on the existing treatments for suicidal patients, including therapy such as Dialectical Behavior Therapy (DBT) and various pharmacological treatments. For therapy buffs, you might be interested to learn more here about the origins of DBT.