Why do pharmaceuticals have half lives, while most other things we interact with don’t?

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EDIT: …Well I messed this thread up. I wasn’t referring to biological half life, but sitting-on-your-shelf half life. (i.e. expiry)

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Anonymous 0 Comments

A pharmaceutical is a foreign substance to the body. It expends effort to neutralize and remove it through the liver and kidneys. Initially at a higher concentration the removal works faster. Later the chemical is still spread out through your body’s tissues and not as much of it comes into contact with the enzymes and filtering mechanisms per unit of time. Some enzymes may also be depleted and need to be regenerated. So the remaining second half takes longer to process than the first half, and so on.

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