Charak Samhita
मन्दवीर्यं विरूक्षस्य हीनमात्रं तु भेषजम्। अतुल्यवीर्यैः संयुक्तं मृदु स्यान्मन्दवेगवत्॥५६॥
॥ Mridu(mild)॥ The drugs with low quality, less effective, mixed with antagonistic drugs, used in lesser doses, in person having excessive dryness in the body (without snehana & swedana) acts slowly and are called as mridu.
english translation
mandavIryaM virUkSasya hInamAtraM tu bheSajam। atulyavIryaiH saMyuktaM mRdu syAnmandavegavat॥56॥
hk transliteration by Sanscript