Caffeine: interactions and contraindications
Caffeine can interact with various medications. When taking medications such as sympathomimetics that increase the heart rate, caffeine can increase their effects. Caffeine counteracts calming agents. It should also be noted that the reduction of caffeine in the body is accelerated by smoking, but is hindered by the active ingredients cimetidine and disulfiram.
Furthermore, caffeine increases the effectiveness of analgesics with the active ingredients acetylsalicylic acid or acetaminophen. If analgesics are taken with caffeine, the dose of the painkillers can usually be reduced. More detailed information on the interaction of caffeine and painkillers should be obtained from your doctor.
Mixture with alcohol
Recent studies indicate that it can also interact with the simultaneous intake of alcohol and caffeine to interact. If you only drink alcohol, you will get tired faster and you will notice that he is drunk. By taking additional caffeine, however, drunkards no longer perceive their intoxication or only in a weakened form. That's why you feel better by mixing alcohol and caffeine.
People with heart problems should check with the attending physician if and how much caffeine they are allowed to consume. The same applies to persons suffering from hyperthyroidism, liver cirrhosis or anxiety syndrome. How much caffeine is allowed in pregnancy is controversial: Small amounts of caffeine have long been considered non-harmful. However, recent studies indicate that even low levels of caffeine could significantly increase the risk of miscarriage. Therefore, it is recommended to abstain from caffeine during pregnancy.
Caffeine in coffee, tea and cola
Caffeine is mainly contained in drinks. The most famous drinks with caffeine are coffee, cola and tea. In tea, caffeine is referred to as a tea, but the two substances are chemically identical. They differ only in the way they are released: While caffeine is already released on contact with gastric acid, teein unfolds its effect only in the intestine: as a result, the effect occurs later, but also lasts longer.
In addition to coffee and tea, caffeine is also contained in cocoa and energy drinks as well as in chocolate. The higher the cocoa content of the chocolate, the higher the caffeine content - with 100 grams of chocolate this is almost equivalent to a small cup of coffee.
Especially with children, you should be careful with drinks and foods such as coke and chocolate: Three glasses of cola and three chocolate bars already contain about as much caffeine as two cups of coffee. Such caffeine intake can cause side effects such as nervousness or sleep disturbances in children.
Caffeine content of foods
- Cup of coffee (150 milliliters): 80 - 120 milligrams of caffeine
- Cup of black tea (150 milliliters): 20 - 40 milligrams of caffeine
- Cup of espresso (30 milliliters): 40 milligrams of caffeine
- Cup of cocoa (150 milliliters): 6 milligrams of caffeine
- Glass of cola (150 milliliters). 15 - 35 milligrams of caffeine
- Energy Drink (150 milliliters): 48 milligrams of caffeine
- Chocolate bar (100 grams): between 15 milligrams (milk chocolate) and 90 milligrams (dark chocolate), depending on the type of chocolate
- Caffeine tablets (per piece): Depending on the dosage, between 50 and 200 milligrams of caffeine
Caffeine for hair loss?
In the meantime, caffeine is not only present in foods, but also in various other products: These include, for example, hair shampoos with caffeine. They should prevent hair loss - but their effectiveness is controversial. In addition to hair shampoos caffeine is also used in various skin care products, as it should have a skin-tightening and skin-smoothing effect.
Furthermore, there are also special caffeine tablets, which is said to have a short-term increase in attention and concentration. In such caffeine tablets, however, you should always consider possible side effects.