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यत्तुषड्विधमास्थापनमेकरसमित्याचक्षतेभिषजः, तद्दुर्लभतमंसंसृष्टरसभूयिष्ठत्वाद्द्रव्याणाम्| तस्मान्मधुराणिमधुरप्रायाणिमधुरविपाकानिमधुरप्रभावाणिचमधुरस्कन्धेमधुराण्येवकृत्वोपदेक्ष्यन्ते, तथेतराणिद्रव्याण्यपि ||१३८||

That non-unctuous enema is of six types having single rasa as said by physician. Drugs possess mostly the combined rasa therefore grouping them in single group is not possible, hence the drugs included in madhura group mean those which are sweet, predominantly sweet, and sweet in vipaka or having effects similar to sweet drugs. This is same for other drugs also.

english translation

yattuSaDvidhamAsthApanamekarasamityAcakSatebhiSajaH, taddurlabhatamaMsaMsRSTarasabhUyiSThatvAddravyANAm| tasmAnmadhurANimadhuraprAyANimadhuravipAkAnimadhuraprabhAvANicamadhuraskandhemadhurANyevakRtvopadekSyante, tathetarANidravyANyapi ||138||

hk transliteration by Sanscript