Side-effects from placebos can be drug specific:
A fascinating study just published in the medical journal Pain examined the side-effects reported by patients taking placebos in clinical trials to test migraine drugs. It found that side-effects from placebo were almost as common as from the actual drug, but most interestingly, were specific to side-effects you would expected from the comparison medication.
In other words, the side-effects you get from a sugar pill in a study on anticonvulsant drugs closely resemble side-effects you get from anticonvulsants and are different from the side-effects you get from a sugar pill in a study on pain killers, which more closely resemble pain killer side-effects.
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