Does the body not clear drugs like caffeine at a constant rate? If you drink less caffeine does the body clear it less quickly? Or am I not understanding it? Caffeine half life is about 5 hours (via Google), so regardless of if I drink 100mg or 900mg of caffeine, half (50mg or 450mg) will be left in my body 5 hours later? That seems like a pretty drastic difference in the rate of clearance.
In: 509
Because that’s what we choose to measure with. Half life is nothing more than expressing how long it takes for half the substance to still exists somewhere or in something (body).
It’s a measurement of the time affecting the substance/element and not of sole weight or mass. We use the same unit for expressing how much time it takes for an radioactive element to decay into a different element. If expressed correctly it should state how much the original amount is and how much time it takes to become half of it.
So if one half-life of element A or substance has passed only the half or the original amount is still left. You can calculate the half-life for 1 pil, amount of grams, amount atoms (or just one) or other units that are usually used to indicate an amount.
So what you said: 400mg of caffeine will be 200mg in one half-life which is around 5 hours later.
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