Charak Samhita
तथायुक्ते हि समुदये समुदायप्रभावतत्त्वमेवमेवोपलभ्य ततो द्रव्यविकारप्रभावतत्त्वं व्यवस्येत् ॥११॥
In such cases, the effect of the dravya or the disease is ascertained on the basis of their cumulative action.
english translation
tathAyukte hi samudaye samudAyaprabhAvatattvamevamevopalabhya tato dravyavikAraprabhAvatattvaM vyavasyet ॥11॥
hk transliteration by Sanscript