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When should placebos be used in clinical research? Can subjects with a medical condition be asked to consent to withdraw from their current medications and take an experimental medication — with the 50/50 chance that what they actually receive will be no medication at all?

Canadian group studies ethical use of placebos

When should placebos be used in clinical research? Can subjects with a medical condition be asked to consent to withdraw from their current medications and take an experimental medication with the 50/50 chance that what they actually receive will be no medication at all?