Synonyms of efficacious in English:

efficacious


See definition of efficacious

adjective

1‘a change in diet may be as efficacious as treatment with steroids’

SYNONYMS
effective, successful, effectual, productive, constructive, fruitful, potent, powerful
worthwhile, helpful, of help, of assistance, beneficial, advantageous, valuable, useful, of use
ANTONYMS

inefficacious