WebMD - Better information. Aug 14, 2017 Caffeine is known to increase alertness. It works by blocking the effects of adenosine, a brain chemical that makes you feel tired. At the same time, it triggers the release of adrenaline, the.

1. Caffeine Download
2. Caffeine Content Of Drinks
3. How Much Caffeine In Coffee
4. Caffeine Withdrawal Symptoms

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• Lowered Anxiety. Caffeine gives you a jolt of energy, but sometimes that jolt can mirror the.
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Prevent your computer from going to sleep

If you have problems with your PC locking or going to sleep, caffeine will keep it awake. It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver.

The icon is shown above - it's the leftmost one in the task tray, and this is all you see. Double-clicking the icon empties the coffee pot (that's what the icon is) and temporarily disables the program. Double-clicking it again refills the pot, and will keep your machine awake.

By default the app starts enabled, and works every 59 seconds. There are some command line switches you can use to alter this behaviour:

• xx - where xx is a number which sets the number of seconds between simulated keypresses. This must be the first text on the commandline
• -startoff - application starts disabled.
• -exitafter:xx - application will terminate after xx minutes
• -activefor:xx - application will become inactive after xx minutes
• -inactivefor:xx - application will become active after xx minutes
• -appexit - terminates current running instance of application
• -appon - makes the current running instance of the application active
• -appoff - makes the current running instance of the application inactive
• -apptoggle - toggles the running state of the current running instance of the application
• -apptoggleshowdlg - toggles the running state, and shows dialog
• -replace - closes the current running instance, replacing it
• -noicon - does not show a task tray icon
• -useshift - simulate the shift key instead of F15
• -allowss - prevent sleep, but allow the screensaver to start
• -stes - tell Windows to stay awake, don't use F15
• -showdlg - shows a dialog indicating whether caffeine is active
• -ontaskbar - show a task bar button (use with -showdlg)
• -key:xx - simulate using virtual key code xx
  Note: the codes on the linked page are in Hex, convert them to decimal for use with this parameter
• -keypress - simulate a full key press, not just a key up event
• -oldicons - use more colourful tray icons
• -lighticons - always use the light icons
• -darkicons - always use the dark icons
• -watchwindow:xx - active only when a window with xx in the title is found
• -activehours:........xxxxxxxx........ - put 24 . or x characters - which indicate from hour 0 to hour 23 of the day. Caffeine will be active only in hours with an x
• -onac - active only when the computer is on AC power (plugged in)

Comparison of methods

Caffeine Download

Video

Caffeine user humancar2n has put together a short YouTube video showing how the app works.

Mac version

Do you need this functionality on your Mac? Intelliscape Software have written a separate app, also named Caffeine, which can help you out.

Versions

v1.97 - April 2021

• Added -lighticons and -darkicons to force one of those

v1.96 - March 2021

• Fixed a crash using -exitafter:
• Added the -onac switch
• Fixed the -oldicons which I broke in a previous release :(

v1.95 - February 2021

• -darkicons command line option removed (Caffeine now reads this from Windows)
• -stes command line option added
• The command line is now interpreted and shows in the tooltip. This means you can see what Caffine has recognised.
• The menu also follows Windows dark mode

v1.90 - October 2020

• -darkicons command line option added
• -activehours command line option added
• Tooltip replaced with a new one which works more reliably
• Menu appearance updated

v1.81 - May 2020

• Bug with the -watchwindow command line fixed

v1.80 - January 2020

v1.64 - September 2017

• Option for old icons added, 'cos not everyone likes the new ones

v1.63 - February 2017

• Icons updated slightly to show up better on a white background.

v1.62 - April 2016

• New icons, designed by Rubén Gómez Radioboy

v1.61 - October 2015

• Fixed bug with app not going active/inactive correctly when a timed period elapsed

v1.60 - July 2013

• New command line options:
  • -allowss
  • -ontaskbar
  • -apptoggleshowdlg
  • -key:xx
  • -keypress
• Added menu items to go Active/Inactive
• Type in About box corrected
• -apptoggle will re-show the dialog if it was originally shown

v1.50 - November 2010

• New command line options:
  • -inactivefor
  • -showdlg
  • -apptoggle
• Simulated keypress changed from right context menu key to F15 as this is likely to be even less intrusive.

Download Caffeine (x86 and x64)

What is caffeine?

Caffeine Content Of Drinks

Caffeine is a bitter substance that occurs naturally in more than 60 plants including

• Coffee beans
• Tea leaves
• Kola nuts, which are used to flavor soft drink colas
• Cacao pods, which are used to make chocolate products

There is also synthetic (man-made) caffeine, which is added to some medicines, foods, and drinks. For example, some pain relievers, cold medicines, and over-the-counter medicines for alertness contain synthetic caffeine. So do energy drinks and 'energy-boosting' gums and snacks.

Most people consume caffeine from drinks. The amounts of caffeine in different drinks can vary a lot, but it is generally

• An 8-ounce cup of coffee: 95-200 mg
• A 12-ounce can of cola: 35-45 mg
• An 8-ounce energy drink: 70-100 mg
• An 8-ounce cup of tea: 14-60 mg

What are caffeine's effects on the body?

Caffeine has many effects on your body's metabolism. It

• Stimulates your central nervous system, which can make you feel more awake and give you a boost of energy
• Is a diuretic, meaning that it helps your body get rid of extra salt and water by urinating more
• Increases the release of acid in your stomach, sometimes leading to an upset stomach or heartburn
• May interfere with the absorption of calcium in the body
• Increases your blood pressure

Within one hour of eating or drinking caffeine, it reaches its peak level in your blood. You may continue to feel the effects of caffeine for four to six hours.

What are the side effects from too much caffeine?

For most people, it is not harmful to consume up to 400mg of caffeine a day. If you do eat or drink too much caffeine, it can cause health problems, such as

• Restlessness and shakiness
• Rapid or abnormal heart rhythm
• Dependency, so you need to take more of it to get the same results

Some people are more sensitive to the effects of caffeine than others.

What are energy drinks, and why can they be a problem?

Energy drinks are beverages that have added caffeine. The amount of caffeine in energy drinks can vary widely, and sometimes the labels on the drinks do not give you the actual amount of caffeine in them. Energy drinks may also contain sugars, vitamins, herbs, and supplements.

Companies that make energy drinks claim that the drinks can increase alertness and improve physical and mental performance. This has helped make the drinks popular with American teens and young adults. There's limited data showing that energy drinks might temporarily improve alertness and physical endurance. There is not enough evidence to show that they enhance strength or power. But what we do know is that energy drinks can be dangerous because they have large amounts of caffeine. And since they have lots of sugar, they can contribute to weight gain and worsen diabetes.

Sometimes young people mix their energy drinks with alcohol. It is dangerous to combine alcohol and caffeine. Caffeine can interfere with your ability to recognize how drunk you are, which can lead you to drink more. This also makes you more likely to make bad decisions.

Who should avoid or limit caffeine?

You should check with your health care provider about whether you should limit or avoid caffeine if you

• Are pregnant, since caffeine passes through the placenta to your baby
• Are breastfeeding, since a small amount of caffeine that you consume is passed along to your baby
• Have sleep disorders, including insomnia
• Have migraines or other chronic headaches
• Have anxiety
• Have GERD or ulcers
• Have fast or irregular heart rhythms
• Have high blood pressure
• Take certain medicines or supplements, including stimulants, certain antibiotics, asthma medicines, and heart medicines. Check with your health care provider about whether there might be interactions between caffeine and any medicines and supplements that you take.
• Are a child or teen. Neither should have as much caffeine as adults. Children can be especially sensitive to the effects of caffeine.

What is caffeine withdrawal?

If you have been consuming caffeine on a regular basis and then suddenly stop, you may have caffeine withdrawal. Symptoms can include

• Headaches
• Drowsiness
• Irritability
• Nausea
• Difficulty concentrating

These symptoms usually go away after a couple of days.

• Caffeine: How Much Is Too Much? (Mayo Foundation for Medical Education and Research) Also in Spanish
• Nutrition and Healthy Eating: Caffeine (Mayo Foundation for Medical Education and Research) Also in Spanish
• Spilling the Beans: How Much Caffeine is Too Much? (Food and Drug Administration) Also in Spanish
• Tired or Wired? Caffeine and Your Brain (National Institutes of Health) Also in Spanish

• Benefits of Java (Academy of Nutrition and Dietetics)
• Caffeine and Alcohol (Centers for Disease Control and Prevention)
• Caffeine and Migraine (American Migraine Foundation)
• Caffeine: Can It Help Me Lose Weight? (Mayo Foundation for Medical Education and Research) Also in Spanish
• Caffeine: How Does It Affect Blood Pressure? (Mayo Foundation for Medical Education and Research) Also in Spanish
• Energy Drinks (National Center for Complementary and Integrative Health)
• Truth About Energy Drinks (American Academy of Family Physicians) Also in Spanish

• Update on Emergency Department Visits Involving Energy Drinks: A Continuing Public Health Concern (Substance Abuse and Mental Health Services Administration)

• ClinicalTrials.gov: Caffeine (National Institutes of Health)

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

How Much Caffeine In Coffee

• Article: Caffeine ingestion improves specific artistic swimming tasks.
• Article: Acute Effects of Caffeine Intake on Psychological Responses and High-Intensity Exercise...
• Article: Spatial analysis of metformin use compared with nicotine and caffeine consumption...
• Caffeine -- see more articles

• National Institute of Environmental Health Sciences Also in Spanish

Caffeine Withdrawal Symptoms

• Caffeine and Your Child (Nemours Foundation) Also in Spanish
• Caffeine Confusion (Nemours Foundation)

• Caffeine in Pregnancy (March of Dimes Birth Defects Foundation) Also in Spanish

• Caffeine in the diet (Medical Encyclopedia) Also in Spanish
• Caffeine overdose (Medical Encyclopedia) Also in Spanish