Charak Samhita
विभ्रंशो विषवद्यस्य सम्यग्योगो यथाऽमृतम्। कालेष्ववश्यं पेयं च तस्माद्यत्नात् प्रयोजयेत्॥८५॥
Improper employment (selection & administration) of shodhana causes dreadful effect similar to visha, where as fruitful effect if used properly. Maximum effort is made to carry out proper shodhana essentially when ever it is needed.
english translation
विभ्रंशो विषवद्यस्य सम्यग्योगो यथाऽमृतम्। कालेष्ववश्यं पेयं च तस्माद्यत्नात् प्रयोजयेत्॥८५॥
Improper employment (selection & administration) of shodhana causes dreadful effect similar to visha, where as fruitful effect if used properly. Maximum effort is made to carry out proper shodhana essentially when ever it is needed.
english translation