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Caffeine is a stimulant drug acting on the brain and nervous system. It is found in coffee, most teas, cocoa, chocolate, cola and energy drinks.

It can make users feel more awake, and raise the heart rate and blood pressure. In larger amounts it can lead to feeling restless and anxious, headaches and can cause trouble getting to sleep or poisoning. Regular consumption may lead to withdrawal problems such as headache, fatigue, irritability, and lack of clarity in thinking.

Follow the links below to find trusted information about caffeine.

Last reviewed: February 2014

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Caffeine | Your Fertility

Caffeine is a stimulant, found in different amounts, in coffee, black and green tea, energy drinks, some soft drinks, and in chocolate

Read more on Your Fertility website

What is Caffeine? | myVMC

Caffeine is a natural substance found in more than 60 plant species including tea leaves, coffee beans, guarana and cocoa seeds. It belongs to a group of drugs called methylxanthines, which have several stimulatory effects on the body.

Read more on myVMC – Virtual Medical Centre website

Caffeine, Food, Alcohol, Smoking and Sleep

Caffeine is a drug that acts as a stimulant, both mentally and physically. It is found in many drinks and foods that are common in our everyday life. These include tea, coffee, chocolate and cola drinks.

Read more on Sleep Health Foundation website

Caffeine Avoidance - BluePages

Find out if avoiding caffeine is likely to help.

Read more on e-hub Web Services - Australian National University (ANU) website

Caffeine - Better Health Channel

Caffeine is a stimulant that acts on the brain and nervous system.

Read more on Better Health Channel website

Caffeine & Energy Drinks Effects and Withdrawal Symptoms | Your Room

Caffeine and energy drinks, when consumed in large quantities, can cause unwanted side effects. Find out about withdrawal symptoms and other FAQs.

Read more on NSW Health website

Pregnancy - Pregnancy Topics - Caffeine in pregnancy

It's best to limit the amount of caffeine-containing drinks you have during pregnancy

Read more on Women's and Children's Health Network website

Caffeine and Sleep | Sleep Health Foundation

Caffeine is a naturally occurring substance that affects the brain and behaviour. It can be found in many different drinks and foods. This includes tea, coffee, chocolate and soft drinks.

Read more on Sleep Health Foundation website

Breastfeeding and maternal caffeine consumption | Australian Breastfeeding Association

Most breastfeeding mothers can consume a moderate amount of caffeine (eg a few cups of coffee each day) without it affecting their babies. Newborn babies however can be particularly sensitive to caffeine. This is because it can take a newborn baby a long time (ie half life of80 hours) to process caffeine. By 6 months, however, it may take a baby only 23 hours to process caffeine.1

Read more on Australian Breastfeeding Association website

Caffeine during pregnancy

Impact of drinking caffeine during pregnancy, recommended daily amounts of caffeine, caffeine amounts in food and drinks, plus links to trusted resources.

Read more on Pregnancy, Birth & Baby website

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