Effective vs. Efficacy — What's the Difference?
Difference Between Effective and Efficacy
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Compare with Definitions
Effective
Having an intended or expected effect.
Efficacy
Efficacy is the ability to perform a task to a satisfactory or expected degree. The word comes from the same roots as effectiveness, and it has often been used synonymously, although in pharmacology a distinction is now often made between efficacy and effectiveness.The word efficacy is used in pharmacology and medicine to refer both to the maximum response achievable from a pharmaceutical drug in research settings, and to the capacity for sufficient therapeutic effect or beneficial change in clinical settings.
Effective
Producing a strong impression or response; striking
Gave an effective performance as Othello.
Efficacy
The ability to produce a desired or intended result
There is little information on the efficacy of this treatment
Effective
Operative; in effect
The law is effective immediately.
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Efficacy
Power or capacity to produce a desired effect; effectiveness.
Effective
Existing in fact; actual
A decline in the effective demand.
Efficacy
Ability to produce a desired effect under ideal testing conditions.
Effective
Prepared for use or action, especially in combat.
Efficacy
Degree of ability to produce a desired effect; effectiveness.
Effective
A soldier or a piece of military equipment that is ready for combat.
Efficacy
Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer.
Effective
Having the power to produce a required effect or effects.
The pill is an effective method of birth control.
Efficacy
Capacity or power to produce a desired effect;
Concern about the safety and efficacy of the vaccine
Effective
Producing a decided or decisive effect.
The president delivered an effective speech!
Effective
Efficient, serviceable, or operative, available for useful work.
How long does it take to make a bunch of civilians an effective military force?
My effective income after taxes and child support is $500 a month.
The effective radiated power is determined by multiplying the transmitter power output with the antenna gain.
The effective voltage of an alternating current is 0.7 times its peak voltage.
Effective
Actually in effect.
The curfew is effective at midnight.
Effective
Having no negative coefficients.
Effective
Approximate; Not describing the fundamental dynamic changes in some system as they happen.
Effective
(military) a soldier fit for duty
Effective
Having the power to produce an effect or effects; producing a decided or decisive effect; efficient; serviceable; operative; as, an effective force, remedy, speech; the effective men in a regiment.
They are not effective of anything, nor leave no work behind them.
Whosoever is an effective, real cause of doing his heighbor wrong, is criminal.
Effective
That which produces a given effect; a cause.
Effective
One who is capable of active service.
He assembled his army - 20,000 effectives - at Corinth.
Effective
Specie or coin, as distinguished from paper currency; - a term used in many parts of Europe.
Effective
The serviceable soldiers in a country; an army or any military body, collectively; as, France's effective.
Effective
Producing or capable of producing an intended result or having a striking effect;
An air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation
Effective teaching methods
Effective steps toward peace
Made an effective entrance
His complaint proved to be effectual in bringing action
An efficacious law
Effective
Able to accomplish a purpose; functioning effectively;
People who will do nothing unless they get something out of it for themselves are often highly effective persons...
Effective personnel
An efficient secretary
The efficient cause of the revolution
Effective
Works well as a means or remedy;
An effective reprimand
A lotion that is effective in cases of prickly heat
Effective
Exerting force or influence;
The law is effective immediately
A warranty good for two years
The law is already in effect (or in force)
Effective
Existing in fact; not theoretical; real;
A decline in the effective demand
Confused increased equipment and expenditure with the quantity of effective work done
Effective
Equipped and ready for service;
The fort was held by about 100 effective soldiers
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