Synonyms of efficacious in English:

efficacious


See US English definition of efficacious

See UK English definition of efficacious

See Spanish definition of eficaz

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