I think inefficiacy
because,
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.
Hope it helps :)
The word that describes how much a drug could harm or damage an organism is toxicity.
Toxicity is called the degree of effectiveness of substances that, due to their composition, there is a certain amount of the substance that could be expected, under specific conditions, to damage an organism. .
Drug toxicity is a measure used to identify the toxic level of some drugs, both affectation / damage that said drug would cause in an organism.
It can be effects of functional deterioration, pathological lesions that affect the functioning of the body and reduce its ability to respond to risk factors or stress.
The severity of a damage is related to the concentration and exposure time and in turn to other variables that must be taken into account since they can modify the magnitude of the effect.
Therefore, we can conclude that the word that describes how much a drug could harm or damage an organism is toxicity.
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