Prothiaden M 50 Tablet 15 belongs to the class of medications known as antidepressants, which are used to treat depression. Depression is a neurological condition. It is a mood disorder characterised by feelings of sadness, loss, or rage that persist. A lack of vitamin B12 can also cause this condition. When other antidepressant medications are ineffective, your doctor may prescribe it.Disclaimer:For More Information Contact Your Physician