Vaman karma is effective in Shodhana of amashya i.e. cleaning stomach
Vaman karma is highly recommended on countering the kapha dosha which is in aggravated state
Vaman karma is very effective and acts as a life saver in situations like ajirn (indigestion), vish peet (consumption of poisonous substance), visuchika (cholera) and virudh aahar (food poisoning).
Vaman not only cleanses the doshas present in stomach but also helps in purification of the whole body as the purvakarmas i.e. Snehan and swedan helps in bringing kleda (aggravated kapha) to the amashya (stomach) which is been removed from the body by practicing Vaman karma