Synonyms of be effective in English:

be effective

See definition of work


1‘no one doubts that these measures will be effective’

succeed, be successful, work, work out, turn out well, go as planned, have the desired result, get results, be efficacious
have an effect, take effect, be efficacious, function, act, have results, take hold
informal come off, pay off, do the trick, do the business
North American informal turn the trick

fail, have no effect