The test would be more effective if the drug was given to half of the participants because it would be possible to compare the effects it had on those participants' bodies with the lack of effects on the participants who didn't take the drug.
If the entire group takes the medication as volunteers, the effects will be observed less carefully, because it will not be possible to perceive secondary changes, caused by the medication, in the volunteers' bodies.
However, by providing the drug to only half of the volunteers, it is possible to compare the results between the two groups of volunteers, avoid possible biases and identify the impact of the drug on the disease and on the body as a whole.
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