How Long Does Caffeine Stay In Your System?

How Long Does Caffeine Stay In Your System?

Caffeine is a stimulant in tea, soda, chocolate, and coffee. If you love coffee, the content can help you boost your alertness, energy and lower your tiredness. On the other hand, consuming too much caffeine can cause headaches, insomnia, high blood pressure, and dehydration. With this, you need to be careful when consuming caffeine. 

Most people drink coffee because of its caffeine content. Are you a coffee lover too? This post is for you. We will discuss how long does caffeine stays in your system and more. 

How long does caffeine last in the human body

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You can feel the effects of caffeine within 15 minutes after you consumed it. It is estimated that the coffee level in your blood peaks around an hour later and stays at this level. About size hours after you consume the caffeine, half of it was still in your system. It may take about 10 hours to clear the caffeine from your bloodstream fully. 

Withdrawal symptoms 

Caffeine consumption is among the best ways to keep you awake. However, there are other alternatives to caffeine that will increase your energy and alertness. Meanwhile, if you decide to stop consuming caffeine, you can experience withdrawal symptoms. These symptoms include the following:

  • Migraines or headaches
  • General fatigue
  • Irritability or crankiness
  • Upset stomach or nausea
  • Lack of concentration
  • Muscle pain

You may resolve these symptoms if you retake caffeine. If you’re determined to stop, don’t worry since withdrawal symptoms will pass within few days. 

Side effects 

Too much consumption of caffeine can have adverse effects. These side effects are:

  • Stomachache
  • Nervousness
  • Diarrhea
  • Irregular or rapid heartbeat
  • Insomnia
  • Increased rate of breathing
  • Irritability
  • Sweating
  • Feeling restless or fidgety
  • Anxiety attacks

If you have liver or kidney problems, you may worsen your health if you take caffeine. So, don’t be too much dependent on caffeine. 

Factors on how long caffeine can affect your system

Your metabolism 

The caffeine can be broken down and processed through a set of enzymes in your liver. Some can metabolize caffeine slowly, and some break it down fast. When you’re hypersensitive to caffeine, you may experience jitters like feelings of restlessness, anxiety, diarrhea, nausea, general discomfort, and heart palpitations, even in small doses. On the other hand, if you’re hypersensitive, you will not feel the stimulating caffeine effect at a normal amount. 

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Your tolerance:

The more you take, the more you become tolerant of its effects. If you’re a new caffeine drinker, you can feel the strong effects of caffeine than those coffee veterans.


Another factor is the amount you take. If your system ingests caffeine of about 50 mg, you can still feel some of its effects. 

Drugs you ingest

If you ingest other drugs than caffeine, it can also affect how you metabolize the caffeine. Thus, may have interactions with other substances you consume. 

Frequently Asked Questions

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The following are some frequently asked questions you can consider about caffeine.

How does caffeine affect your sleep? 

The effect of it may last throughout the day. It can lower the quality of your sleep and lead to disrupted sleeping patterns. However, the impact of caffeine on your sleep patterns can depend on how much you consumed and your sensitivity to it. Most adults take 200 to 300 mg daily; if you consume more than this amount, you may suffer from sleep problems.

What to do if caffeine disrupts your sleep? 

If consuming, it gives you sleepless nights, we recommend reducing your intake until you identify the correct limit. You can also practice relaxation techniques before going to bed, like breathing exercises or gentle yoga. It is also a good idea to establish a regular sleep schedule by going to bed and waking up at the same time every day. So, you can regulate your body and lower your need for stimulants, especially caffeine. 

How can you increase your energy levels without depending on caffeine? 

We can’t deny that drinking coffee and other caffeinated beverages is among the ways many people use to stay awake. Well, if you want to improve your energy levels without caffeine intake, you can consider the following alternatives.

How Long Does Caffeine Keep you Awake?

You may have heard that caffeine can help promote wakefulness and alertness. This is true, but because caffeine is a stimulant, you might find yourself feeling jittery and unable to sleep.

The precise length of time it takes for caffeine to wear off varies from person to person. The consensus is that if you consume 200mg or less of caffeine at a time, the effects will last for about 4-6 hours. If you consume more than 200mg, the effects will last about 8 hours.

Can Caffeine in the morning Affect Sleep at Night?

The short answer is yes. Drinking caffeinated beverages, especially coffee, in the morning can affect sleep at night. Caffeine stays in the system for up to 8-12 hours and that means that you have to stay away from it by the time you go to bed for it not to affect your sleep.

It’s also worth noting that caffeine has a cumulative effect on sleep. It’s best to keep away from it altogether or drink it afternoon because of the negative effect of caffeine on your body clock – which controls how much time you spend asleep and awake.

How Much can Caffeine Raise Your Blood Pressure?

400mg of caffeine will raise blood pressure faster than taking 100mg doses of caffeine because it takes time for the body to break down large doses.

The half-life time for caffeine is 3-7 hours, which means that after 3-7 hours (depending on how much someone has taken), they will need to take another dose or they will start feeling drowsy again.

How Long does 200mg of Caffeine Last?

The effects of caffeine generally last for 4-6 hours. The length of time it lasts depends on the amount of caffeine you consume and your body’s capacity to metabolize it.

Caffeine is also very water-soluble, so it can be eliminated from the body by drinking lots of fluids or taking a diuretic like coffee or tea.

How to get Caffeine out of Your System?

If you are looking to get the caffeine out of your system, take a break from drinking coffee or other caffeinated drinks and drink plenty of water instead. Keep in mind that it will take a little longer for you to get all the caffeine out if you have more than just one cup a day because the substance is stored in your body’s tissues and fluids.

How Long Should I Wait to Breastfeed after Drinking Coffee?

Before consuming any caffeine, feed your baby. After that, wait at least three hours before trying again to breastfeed. This should allow enough time for your body to metabolize the caffeine, preventing it from being passed on to your baby through breast milk.

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Can Caffeine Affect you 12 hours Later?

The body takes an average of 12 hours to completely remove caffeine from the bloodstream, though this might take more or less time depending on individual circumstances. Certain factors such as pregnancy, liver disease, and other medicines can also affect the pace at which caffeine leaves the body.”


Sleep at least 7 hours per night

Drink more water

You should avoid daytime naps as much as possible

Exercise regularly, but not too close to bedtime
Eat more plant-based foods that can offer you energy 

Reduce your stress levels by practicing a healthy lifestyle

Keep in mind that underlying conditions such as depression or anxiety can also impact your energy levels. 

What drinks and food contain caffeine? 

You can found them in different plants since it is a natural substance. Cocoa beans, coffee, and tea leaves contain caffeine. There are also caffeine artificial forms that are usually added to energy drinks and sodas. The following are the drinks and foods that contain caffeine.

  • Energy drinks
  • Chocolate
  • Green and black tea
  • Coffee and espresso drinks
  • Soft drinks

What to do if you consume too much? 

There is no clear process on how to process caffeine quickly. However, the following things may help you feel better:

  • Eat food – since caffeine suppress appetite, you can eat
  • Drink water – caffeine will dehydrate you
  • Exercise – you can burn excess energy caused by caffeine intake through exercising 


To sum it up, various factors may affect how long does caffeine stays in your system. You should be careful in consuming caffeine to avoid its negative effects. More importantly, you should remind yourself not to be too dependent on caffeine to improve your energy levels. 

Like what we mentioned above, caffeine can disrupt your sleep and worsen your health conditions, especially if you have kidney or liver problems. You can consult your medical specialist before consuming caffeine. 

It is also beneficial to practice other alternatives to boost your energy instead of consuming too much caffeine. 

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