Do Most Medicines Heal? What NNT and NNH Really Mean
The claim that most medicines have “zero healing properties” is misleading. Many illnesses improve naturally, but medicines can relieve symptoms, prevent complications, treat infections and reduce the risk of serious disease when used appropriately. Clinical trials often use NNT (number needed to treat) and NNH (number needed to harm) to measure benefits and risks. An NNT of 3 does not mean only one out of three people gets relief. It means one additional person benefits from the treatment compared with a placebo group. Paracetamol and statins have different uses, benefits and risks for different patients. Concerns about side effects should be discussed with a qualified doctor or pharmacist rather than used as a reason to stop prescribed medication without advice. How much should patients rely on NNT and NNH figures when deciding whether a medicine is worth taking?
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