Charak Samhita
विरेचनानां सर्वेषां सुधा तीक्ष्णतमा मता। सङ्घातं हि भिनत्त्याशु दोषाणां कष्टविभ्रमा॥३॥
[Purgative effects of Sudha] Guna (qualities): Tikshnatama(strongest/drastic), among all purgative drugs snuhi is the drastic purgative. It disintegrates the accumulated impurities quickly.
english translation