Introduction
Caffeine is found in most beverages, foods, and medicines. It is used to keep alert and awake. Caffeine is considered a drug. If consumed more than the dose considered to be safe, it is known as intoxication or overdose. The safe amount of caffeine may differ based on age, weight, and overall health.
What Is Caffeine?
Caffeine occurs naturally in certain plants. It can be man-made and incorporated into food products. It can stimulate the central nervous system (CNS) and act as a diuretic (increase urination). An overdose of caffeine occurs when a person ingests more than the recommended dose of caffeine, either accidentally or purposefully. Caffeine is found in the following products:
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Particularly soft drinks.
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Teas.
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Chocolates, including dark chocolate drinks, contain caffeine.
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Coffee and certain energy drinks.
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Certain stimulants keep a person awake.
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Supplements used for working out the body easily absorb caffeine. Its effects are experienced within five to 30 minutes of consuming it. These effects include increased breathing, heart rate, mental alertness, and physical energy, which may last 12 hours.
Caffeine’s reactions depend on the person’s body mass, health, and metabolism. Research has found that 400 mg daily or less is considered safe for the general population. It is considered the world’s most used drug for mental alertness and can act as an adenosine receptor antagonist. Its effects are experienced at 50 milligrams (mg) to 200 mg. It can reach its highest plasma concentration levels in 30 to 60 minutes. When the consumption of caffeine is not loosely regulated or appropriately guided, it may lead to an overdose. This may further show the route to fatal outcomes. If a person consumes more than 400 mg of caffeine, it may lead to a caffeine overdose.
What Is Caffeine Intoxication?
Many people use caffeine every day. It helps stimulate the brain. If consumed more than the safety dose, caffeine intoxication can result in overdose or intoxication, which can be unpleasant to life-threatening. Adolescents should limit their caffeine intake to 100 mg daily, and pregnant women must limit their intake to 200 mg daily.
The half-life of caffeine is 1.5 to 9.5 hours. This means 1.5 to 9.5 hours are required for caffeine levels to drop to half their original amount. This variation in the half-life makes it challenging to know the exact levels of caffeine that cause caffeine intoxication. Additional sources of caffeine include:
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Candy.
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Medications and supplements.
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Food products that increase energy levels.
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Chewing gums of certain types.
What Are the Causes of Caffeine Intoxication?
Consuming more than the required amount of caffeine through food, drinks, or medications leads to caffeine intoxication. This may result in significant health issues like irregular heartbeats, seizures, and hormonal imbalances.
The lethal dose of caffeine is found to be 80 to 100 micrograms per milliliter (micrograms/ml) in the blood concentration. This can be achieved with amounts of 10 grams or more. This condition is rare to occur unless there is an intentional overdose of medications. Among children, this condition may be caused by accidental ingestion.
Some drugs that affect caffeine exposure include decongestants, bronchodilators, or stay-awake pills. It was estimated that 3702 cases of caffeine exposure were reported in the United States (U.S.).
What Is the Pathophysiology of Caffeine Intoxication?
Caffeine can affect many receptors, so its side effects are profound. Caffeine is considered to be a natural alkaloid methylxanthine that acts as a nonselective antagonist of adenosine receptors. Caffeine can trigger seizures with A1 antagonism and cerebral and coronary vasoconstriction with A2 antagonism. It inhibits phosphodiesterase, which results in increased intracellular levels of cyclic adenosine monophosphate (AMP) and calcium.
Caffeine stimulates catecholamine release. Noradrenaline, with beta 1 agonist activity, may cause tachycardia, and beta 2 agonist activity can cause peripheral vasodilation and hypotension. Caffeine can sensitize dopamine receptors and is a competitive antagonist of benzodiazepine receptors. It can increase renin secretion and may result in initial hypertension, sodium retention, and water retention.
What Are the Symptoms of Caffeine Intoxication?
Symptoms caused by caffeine intoxication may be either severe or not profound. Symptoms include:
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Fever.
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Experience tachycardia (increased heart rate) or bradycardia (decreased heart rate).
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Initially, hypertension can lead to hypotension later.
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Pupils may exhibit mydriasis (the black center of the eye gets enlarged).
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Uncontrolled muscle movements are observed.
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The ability and activity of the mind are altered.
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Change in anxiousness or nervousness of a person.
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Confusion and hallucinations are experienced.
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Seizures and delusional thoughts are exhibited.
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Nausea and vomiting are observed.
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Insomnia, diarrhea, headaches, and increased thirst may be experienced.
How to Diagnose Caffeine Intoxication?
If caffeine intoxication is suspected, healthcare professionals should be provided information about the consumed caffeinated items. Routine serum laboratory tests are essential to understanding this condition. Vital signs, seizures, and altered sensorium should be managed and monitored. Serum caffeine levels can be determined by immunoassay.
A venous blood gas may help to know about metabolic acidosis. Caffeine toxicity may lead to hypokalemia (decreased potassium levels), hypocalcemia (decreased calcium), hyponatremia (decreased sodium), and hyperglycemia (increased glucose levels). Serum myoglobulin and creatine kinase levels must be found to know about rhabdomyolysis. An electrocardiogram helps determine tachycardia and heart rate and detect dysrhythmias like ventricular atrophy and fibrillation early.
What Is the Treatment for Caffeine Intoxication?
Treatment is given to take out the caffeine from the body, and the symptoms are to be managed.
Activated charcoal is used to remove caffeine. This prevents the caffeine from moving into the gastrointestinal tract. If caffeine is already in the gastrointestinal tract, gastric lavage (a tube is used to clean the contents out of the stomach) is done, or laxatives are used. The heart is checked using an electrocardiogram. Breathing support is given if necessary. Caffeine intoxication can be prevented by avoiding excess caffeine intake. Caffeine should be limited to 400 mg per day. If the person is sensitive to caffeine, caffeine should be avoided entirely.
Conclusion
Caffeine is a substance that occurs naturally. It may be found in foods, drinks, and medications. When consumed in limited amounts, it is safe to consume. It has effects on the CNS and physical energy. When consumed at more than the safe dose, it causes caffeine intoxication. This may cause various symptoms, which may be severe. If not treated or if consumed excessively, it may end in fatality. This complication is rare in occurrence. Hence, knowing about caffeine, caffeine intoxication, causes, symptoms, and management becomes essential.
