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stages of drug testing (preclinical trials (drugs are tested on human…

- - - - To test how well the drug works, patients are put randomly into 2 groups.
      - One group is given the new drug whereas the other is given a placebo (a substance like the drug that does nothing).
        
        This is so the doctor can see the actual difference the drug makes and allows the placebo effect to occur (when the patient is expecting the drug to do something and therefore feels better, even though the treatment did nothing)