It is mainly treatment of  Pitta Dosha and Rakta Dosha.Properly Snehan and Sweden is done before Virechan.Aragvadha phant,Jalpal,Triphala kadha is useful for virechana Karma.Dhushit Dhoshas are excreted through loose motions.
Virechana or purgation therapy is a systemic therapy for the diseases of pitta dosha. Purgation therapy is indicated in diseases of skin, fever, diabetes, bleeding of upper channels like mouth, nose etc., diseases of gastrointestinal tract, piles, abdominal tumour, enlargement of spleen, anuria, helminthiasis, erysipelas, gout, vaginal diseases, fistula-in-ano, tumour, glandular swelling, anemia, jaundice, loss of appetite etc.
Diseases-

1.Jaundice

 2.Skin Diseases.

3.Herpes Zoster.

4.Paralysis.

5.Urticaria