Cancerefficacy Share Tweet Effectiveness. In medicine, the ability of an intervention (for example, a drug or surgery) to produce the desired beneficial effect.( EH-fih-kuh-see )Source: NCI Dictionary of Cancer TermsSearch the Glossary of Medical Terms Previous: Effexor Next: effusion NewsletterSign up for the QuackTrack.org newsletter below! Click to commentLeave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment *Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ QuackTrack on TwitterTweets by QuackTrack_org Trending Posts