Usage Note
Efficace does not change its ending for feminine — une méthode efficace, un remède efficace. It describes something that achieves the intended result. The related noun is l'efficacité (f). Note that efficace (achieving a result) differs from efficient (achieving it with minimal waste), though both can translate as 'efficient' in casual use.
Examples
"Ce médicament est très efficace contre la douleur."
Natural Translation
This medicine is very effective against pain.
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