Why do some pills have to be swallowed whole?

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Because many pills are engineered objects, not just compressed powder, and breaking them breaks the engineering. The NHS Specialist Pharmacy Service explains the structures: enteric-coated or gastro-resistant tablets carry a coating designed to survive stomach acid so the drug releases later, either to protect the stomach from the drug or to protect the drug from the acid, and crushing one delivers the full dose at the wrong place; modified-release tablets and capsules are built to leak the drug slowly over hours, and crushing them dumps the entire day's dose at once, which can be dangerous. The NHS advice to patients is blunt: do not crush pills, open capsules, or alter your medicine without getting medical advice, because it could stop the medicine working properly. The nuance: scored tablets are designed for halving, and some modified-release capsules can be opened and the beads swallowed without chewing, per NHS SPS, but check drug by drug. If swallowing is the problem, the fixes exist: many medicines come as liquids or dissolvable tablets, and a pharmacist can tell you which pills in your regimen are safely split or opened. The shortcut to never take: crushing a pill because it is big without checking first, especially anything labeled SR, XR, ER, LA, EC, or enteric-coated.

Why do some pills have to be swallowed whole?

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