Kashayas are Ayurvedic preparations which are otherwise called Kwathas  prepared from heating the drugs inl the form of  coarse powder with a definite proportion of water.  The solution is boiled and mede into one eighth of the total volume, so that it contains water soluble contents of the medicine.  We use different Kashayas for different conditions of patients and their diseases.

Dasamoola Katuthrayam, Amruthotharam, Drakshadi Kashayam etc..etc.. are the well known kashayas mentioned in the Ayurveda Classics.