Psychotherapy is the treatment of choice for individuals suffering from any type of dissociative disorder. Approaches vary widely, but generally take an individual modality (as opposed to family, group, or couples therapy) and emphasize the integration of the various personality states into one, cohesive whole personality. It should be noted that while it’s convenient to describe people who suffer from this disorder as having “multiple personalities,” this is just a theoretical construct. People who suffer from this disorder believe they have multiple personalities which then take on a life of their own within the individual (perhaps reinforced by the belief). The new term for this disorder in the DSM-IV more accurately reflects the problem — the individual suffers from dissociative identities. Their personality is the sum of these identities, which have been split off at some point in the past. The split is usually due to an individual or multiple traumatic events.
Medication is not generally effective for this disorder. Maintenance and effective use of prescriptions, given the multiple personality states, is difficult to attain. If medication is prescribed for a psychiatric condition that co-occurs with an identity disorder, it should be carefully monitored.
In a growing trend, people with this disorder are starting to come together to form mutual self-help support groups within larger communities and virtually, through online communities. There is no obvious reason why a support group for this disorder would not be beneficial to individuals.
For more on symptoms, please see symptoms of dissociative identity disorder.