How to reduce the caffeine on your body?

Is there a way to reduce the quantity of caffeine on your body, like an antidote?
For example, if you take an expresso or a certain amount of coffee to keep you awake (for finish a work or study), but then you realize that you don't need to be awake all night, is there something that cuts the effect of caffeine (food or drink for example) you have on your body?

I've searched in your FAQ, but didn't find anything.

Thanks in advance
Tiago
Portugal

Caffeine "Antidote" Tried

Here is an unofficial experiment. I am very sensitive to caffeine but I have two exams and a presentation next week so I was falling asleep studying and to force myself to stay awake I used 4 cups of high caffeine Black Nepal and Green tea mixed. About an hour later I felt my heart racing and felt like I would die giving me anxiety. I searched and found this site and tried the following advised remedies and with 5-10 minutes was feeling much better.

1. Took a magnesium supplement
2. Drank 2 glasses of spring water
3. Ate an egg sandwich with 2 ounces of melted cheese on top, 1 slice of canadian bacon (optional) on an english muffin.

I still don't feel tired and my heart is still a little jumpy but I immediately (5-10 min. felt myself calm down)

Foods with Melatonin

Purslane has the most melatonin and it is buffeted with omega 3 healthful oil.
Get it at a well stocked produce section which caters to Mexicans.

Eat some toast with smoked salmon on top, and keep your heart lubed
so that it is not jittery from the knocks of the caffeine.

There are no chemical isomers of caffeine : no teaine from tea, mateine from yerba mate, etc.
The structure forbids it. Caffeine is caffeine.

Heavy food

I find just eating some heavy food helps. It is common to have a coffee after heavy food to wake oneself up. It makes sense, then, that heavy food should counteract the feeling of too much caffeine.

Caffeïne 'antidotes'

A way to really reduce the amount of caffeine in your body: smoking cigarettes. The half life of caffeine will be lowered by 50% (so caffeïne leaves your body twice as fast). Of course this isn't a reason to pick up smoking! Drinking a few glasses of water and taking a high dose of vitamin C (> 1000 mg) may also speed up the breakdown a bit. Another way to counteract the effects of caffeïne: valerian and melatonin are natural and side effect-free ways to induce sleep. There is a big array of herbs you can take for this reason, and stronger sedatives will also work which can be dangerous so know what you are doing! Always check if there are side effects and look if it is worth any of the possible side effects. Alcohol may also help but use your common sense if it's worth the hangover and don't mix with other sleep-inducing substances. Don't use alcohol with a big caffeïne overdose: alcohol is a diuretic too so you may end up going to the toilet every 10 minutes and be at risk of dehydration. You can smoke some pot too but don't get into legal trouble, that's may cost you more nights of sleep than your caffeïne overdose. The best way to get a decent sleep is of course just not taking too much caffeïne a few hours before your intention to sleep!

Seriously

How stupid are you? Advising anyone to smoke, drink, smoke dope and take sleeping tablets.

Water, vitamin C and melatonin (a natural hormone you can get at a drug store) are all good.

honesty is stupid?

That was not stupid. Factually it is correct. Smoking reduces the half life of caffiene. I don't think he was advising anyone to do those things, just answering the question.

Relax.

Caffeine 'antidote'

I'm caffeine sensitive and have found that if I, for example, get regular coffee instead of decaf at the coffee shop, a glass of milk, a raw carrot (chew well) and at least 600ml water settles the jitters and lightheadedness in about 30 minutes. During that time I prefer to go for a brisk walk or jog. DO NOT eat anything sweet, including fruits, as this will make it worse.

just pop a magnesium

just pop a magnesium supplement...works really well..

That works. What also works

That works.
What also works is to sweat it out, pee it out, or throw it up.

So, drink a lot of water, and run. You'll get it out very quickly this way.

Don't throw up

It's too late to throw up about 5 mins after you've ingested it. Caffeine gets into your blood stream REALLY quickly. Take some of the other (sensible) advice.

When i had caffeine

When i had caffeine poisoning from "chefir"(extremely strong tea) and the psychosis started i went to doc and i was told to drink lots of peppermint tea to get the caffeine out of the body.

When I had caffeine

Have you tried chamomile tea? I would think that would work also.

Caffeine is dangerous

I believe caffeine is like smoking used to be - deadly. But it's a multmillion dollar or multibillion I should say, industry and they arn't going to tell us. Caffeine can give you panic attacks and anyone who suffers from anxiety should stop ALL caffeine. Do it gradually though as, if you consume a lot, the withdrawal can just about kill you, literally.

Caffeine vs. Nicotine

Caffeine is nothing like smoking in the health effects it produces. Smoking causes nearly 5 million deaths annually worldwide, and smoking increases your chance of a heart attack 2 to 4 times. Caffeine in normal doses can actually have a protective benefit on the heart, and decreases your chance of developing diabetes. I could not find annual caffeine death statistics aside from a few megadoses cases where amounts were taken 17x and above the overdose range of 300mg. This means the death by caffeine would range in a total consumption of 5g of caffeine. Although this depends on you weight and size. Your hatred of big business clearly show why caffeine is so bad. Thank you for enlightening me. (I'm being fecetious) Please provide evidence as to why you believe this, because frankly, what you believe is wrong.

http://www.ncbi.nlm.nih.gov/pubmed/15935584 (smoking deaths)
http://www.energyfiend.com/death-by-caffeine (I would have to drink 170 cans of red bull to kill myself)
http://www.americanheart.org/presenter.jhtml?identifier=4726 (smoking 2 to 4x)
http://www.medicinenet.com/caffeine/page4.htm#heart (protective benefit to the heart)

Oops

I mean smoking still is dangerous but they used to tell us it made us sexy, instead of telling us it makes you stink, will steal all your money and will kill you, slowly, in the most vile ways imaginable. How programable are we? Hugely.

Programmable

You are programmable, I make my own decisions. I still don't see how this shows that caffeine will cause the demise of thousands. Smoking is bad. I get it.

Elvis

Time is the only thing that will reduce the amount of caffeine in your system. You could conceivably take something with an opposite effect that would make you sleepy but then you might be called Elvis.