The difference between Efficacious and Successful
When used as adjectives, efficacious means effective, whereas successful means resulting in success.
check bellow for the other definitions of Efficacious and Successful
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Efficacious as an adjective (formal):
Effective; possessing efficacy.
Examples:
"this medicine is efficacious'"
"synonyms: effective"
"ant inefficacious"
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Successful as an adjective:
Resulting in success; assuring, or promoting, success; accomplishing what was proposed; having the desired effect
Examples:
"a successful use of medicine; a successful experiment; a successful enterprise"
"synonyms: prosperous fortunate happy"