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robbcfd robbcfd
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12 years ago
I've heard that if you drink coffee it takes about seven hours for caffeine to really take effect. That's why it's not recommended after 2 P.M., because it can affect your sleep. And if you are sleepy, a cup of coffee will not help.
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#1
12 years ago
I don't know, but I have heard that caffiene stays in your body for up to 20 hours.
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#2
12 years ago
The coffee ,respectively the cafeine in it acts quickly after been taken,at about 30 to max.45 minutes..and the effect is at present.The elimination of coffee takes approx.3 to 5 hours..
wrote...
#3
12 years ago
Well its stays in your body for about 7 to 8 hours but it takes effect right away. if you drink a cup of coffee it is speeding through your body before you are done with the first cup. But it starts to dissipate after couple hours but does not wear off completely for hours.
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#4
12 years ago
I don't know how long it takes to fully kick in, but I know that if you take it along with pain meds like aspirin or acetominaphen, the pain goes away a lot sooner.  That why Excedrin Migraine and some generic meds of the same combination work so well.  So to some degree, the caffeine starts working pretty quickly.  

I also know that after two cups of coffee in the morning, if I wait too long to eat lunch, I can really feel the effects... I get all shaky and sometimes start feeling faint.
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