Caffeine is primarily used to increase mental alertness and reduce fatigue. It belongs to the group of stimulant medications.
Other uses of caffeine include the management of migraines, apnea of prematurity, post-surgical headaches, tension headaches and enhancing athletic performance.
Nervousness or restlessness
Upset stomach
Increased heart rate
Headache
Frequent urination
Caffeine is a central nervous system stimulant.
It primarily works by blocking the action of adenosine, a neurotransmitter that relaxes the brain and promotes sleep. When adenosine is blocked, the levels of other neurotransmitters like norepinephrine and dopamine increase, stimulating heightened neural activity.
Doctor of Medicine
BMS, FMC, MD Resident
Caffeine can be taken orally (tablets, oral solutions, capsules) or administered intravenously (injection).
Caffeine is generally safe for consumption by adults and children over the age of 12.
Caffeine should be used with caution in individuals with anxiety disorders, bipolar disorder, bleeding disorders, heart conditions, diabetes, Irritable Bowel Syndrome (IBS), epilepsy, glaucoma, high blood pressure, osteoporosis and schizophrenia.
Caffeine can interact with other stimulants (such as ephedrine), heart rate-slowing medication (like adenosine), and antibiotics (like quinolones).
Consuming excessive amounts of caffeine can lead to toxicity with symptoms such as arrhythmia, seizures and even death if doses exceed 1200mg. Seek immediate medical care if you suspect a caffeine overdose.
If you miss a dose of your prescribed caffeine medication, take it as soon as you remember but do not double up on doses.
Most side effects are temporary and generally harmless and resolve when discontinuing this medicine. However, if you experience any severe side effects or worsening of any of the symptoms, please consult your doctor.
Consuming plenty of water can help manage some of these side effects. If symptoms persist or worsen, consult your doctor.
Caffeine, being a stimulant, generally does not impair the ability to drive or operate heavy machinery. However, if you feel jittery or uneasy after consuming caffeine, it is best to refrain from such activities.
It is recommended that pregnant women limit their caffeine intake to less than 300 mg per day due to potential effects on foetal circulation. The use of caffeine while breastfeeding should be discussed with your doctor as caffeine can pass into breast milk.
Individuals with heart conditions should exercise caution when consuming caffeine as it can cause irregular heartbeat in some cases.
Those with gastrointestinal issues like diarrhoea or Irritable Bowel Syndrome (IBS) should also be mindful as caffeine can exacerbate these conditions.
Maintain hydration, especially when consuming caffeinated beverages as they can have diuretic effects.
Frequently asked questions
No, caffeine is not a steroid. It is a stimulant compound that is naturally found in coffee, tea and cacao plants and is added to many beverages and supplements.
Yes, caffeine can disrupt sleep as it stimulates the central nervous system. This may cause difficulty in falling asleep, shorter sleep duration and poorer sleep quality.
Some studies suggest that high caffeine intake may increase the time it takes to get pregnant. However, moderate consumption does not seem to have a significant effect.
Consumption of caffeine is generally safe for most people when taken in moderation.
Caffeine is rapidly absorbed from the stomach within 45 minutes of ingestion and reaches peak blood levels within 60 minutes.
The best time to take caffeine depends on individual needs and lifestyle factors. Most people use it in the morning or early afternoon to help increase alertness and reduce fatigue.
The duration of treatment with caffeine varies depending on the condition it is being used to manage. It is important to follow your doctor's instructions.
Caffeine in other salts
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