It’s useful mostly in Pitta disorders. Many gastrointestinal & dermatological ailments are cured by this therapy.

Healthy individuals are advised to undergo Virechana during Sharad Ritu (period of October heat).
‌As Varsha Ritu concludes with cessation of Monsoons, there is simultaneous commencement of Sharad Ritu (period of October heat). Due to increased temperature in conjunction with elevated humidity, everyone gets infuriated with increased perspiration. Climatic changes obviously affect human body. In this time of year, Pitta Dosha gets aggravated leading to various ailments.
‌Ayurveda emphasizes on staying healthy rather than consuming medicines after being diseased. As a part of achieving this aim, Ayurveda has advised to undergo season specific cleansing processes. Hence one must undergo Virechana therapy in Sharad Ritu for staying healthy. Virechana; if done scientifically and under proper guidance alleviates Pitta without causing any troublesome side effects or complications.
‌Thus, Virechana therapy is key to well-maintained health during Sharad Ritu.