
erfolgreich
successful
Having achieved the desired goal or a positive result; with success.
Nach langem Training war sie bei dem Wettkampf endlich erfolgreich.
After long training, she was finally successful in the competition.
successful
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successful
Having achieved the desired goal or a positive result; with success.
Nach langem Training war sie bei dem Wettkampf endlich erfolgreich.
After long training, she was finally successful in the competition.
The adjective 'erfolgreich' (successful) is made up of the noun 'der Erfolg' (success) and the suffix '-reich' (-rich, full of). It literally means 'rich in success.'
Sie ist eine sehr erfolgreiche Geschäftsfrau.
She is a very successful businesswoman.
'Erfolgreich' (successful) can be used as an adjective before a noun, as part of the predicate with 'sein' (to be), or as an adverb to describe a verb.
Das war ein erfolgreicher Tag.
That was a successful day.
Common verbs that are combined with 'erfolgreich' (successful/successfully) are 'sein' (to be), 'werden' (to become), 'abschließen' (to complete), 'beenden' (to finish), or 'verlaufen' (to go/proceed).
Das Meeting ist sehr erfolgreich verlaufen.
The meeting went very successfully.
effective / valid
“Erfolgreich” and “wirksam” can both describe a positive treatment. “Wirksam” emphasizes that the treatment produces an effect, while “erfolgreich” highlights that the goal set or the desired result was achieved.

Die Behandlung war erfolgreich, weil das vereinbarte Therapieziel erreicht wurde.
The treatment was successful because the agreed-upon therapy goal was achieved.
Die Behandlung war wirksam und verringerte die Schmerzen deutlich.
The treatment was effective and significantly reduced the pain.