WordNet records no synonym and no antonym for holistic medicine. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
medical care of the whole person considered as subject to personal and social as well as organic factors
“holistic medicine treats the mind as well as the body”
Synonyms, antonyms and the broader and narrower relations for holistic medicine come from Princeton University’s WordNet. Full sources and licences.