Astanga Hrudaya
प्रयोजयेच्छिलाह्वं वा ब्राह्मं वाऽत्र रसायनम् । तथामलकलेहं वा प्राशं वाऽगस्त्यनिर्मितम् ॥ ५५ ॥
either (silajatu) rasayana (vide chapter 39 of uttarasthana) or brahma Rasayana or amalaka rasayana or that prepared by sage Agastya i.e., Agastya Rasayana (all these are mentioned in chapter 39 of uttarasthana) should be administered.
english translation
prayojayecchilAhvaM vA brAhmaM vA'tra rasAyanam । tathAmalakalehaM vA prAzaM vA'gastyanirmitam ॥ 55 ॥
hk transliteration by Sanscript