Cakradatta (Cikitsasangraha) 72.19

72.19

na tu bhuktavate deyamāsthāpanamiti sthitiḥ .
āmaṃ taddhi haredbhuktaṃ chardidopāṃśca kopayet .. 18 ..

An evacuating enema should not be administered to one who has eaten; this is the rule.
For it would draw down the undigested food that was eaten and aggravate vomiting and other doṣas. (18)