In this scenario, I'm interested in Daflon (Trade name). Could misdiagnosis be harmful and turn the Pharmacological and therapeutic effect of a drug (Daflon) into an adverse reaction? We know that Daflon is used in case of chronic venous insufficiency as it helps with capillary permeability, etc..But is it dangerous for someone with healthy veins to ingest Daflon? Does decreasing capillary permeability in case of healthy veins(someone who is healthy) affect it in a negative way? And if so, is it imperative that drug shouldn't be given unless we are 100% sure of the diseased state, so when given the drug, it'll return normal? And how can I know when the drug pharmacological effect can be turned into an adverse reaction?

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