Charak Samhita
बलकोष्ठव्याधिवशादापञ्चपलाभवेन्मात्रा। मृदुकोष्ठाल्पबलानांसहभोज्यंतत्प्रयोज्यंस्यत्) ॥३१॥
Castor oil should be administered up to the dose of five pala depending on the strength of the person, nature of disease, and the koshta. If the person is weak and is of mridu kosta (laxed bowel) then, castor oil should be given along with food.
english translation
balakoSThavyAdhivazAdApaJcapalAbhavenmAtrA। mRdukoSThAlpabalAnAMsahabhojyaMtatprayojyaMsyat) ॥31॥
hk transliteration by Sanscript