Charak Samhita
दत्तः शनैर्नाशयमेति बस्तिः कण्ठं प्रधावत्यतिपीडितश्च। शीतस्त्वतिस्तम्भकरो विदाहं मूर्च्छां च कुर्यादतिमात्रमुष्णः॥२१॥
If the bladder is compressed slowly, then the enema- fluid may not reach the colon. If the bladder is strongly compressed, then the fluid may rush very fast even up to the throat. If the enema- fluid is very cold, then it may cause stiffness. If the enema – fluid is very hot, then it may cause burning sensation and fainting.
english translation
dattaH zanairnAzayameti bastiH kaNThaM pradhAvatyatipIDitazca। zItastvatistambhakaro vidAhaM mUrcchAM ca kuryAdatimAtramuSNaH॥21॥
hk transliteration by Sanscript