What are the effects of caffeine?

Stimulant. Caffeine's effects often depend on the individual. For some people, it can provide energy, focus, and alertness. In others, and especially at higher concentrations, it can cause jitteriness, problems sleeping, and palpitations. With repetitive use, you may become tolerant to caffeine, meaning its effects are reduced over time.
Many. It is a stimulant, chemically similar to amphetamine but much less potent. It can cause anxiety, tremor, insomnia and irritability, and in some very sensitive people, this can be severe and include elevation of blood pressure and pulse. In high doses, like in some of the energy drinks, some of these symptoms have had serious consequences, with a few deaths, probably due to heart arrhythmias.

Related Questions

What are the effects of caffeine and aspirin on avid runners?

Aspirin side effects. Caffeine shouldn't have significant adverse effects beyond insomnia if taken within a few hours of try to sleep. Aspirin when used intermittently in adults also shouldn't be a problem. When used chronically it can put you at increased risk for bleeding and high doses can be toxic. Follow the package labeling to be safe.

What are the effects of caffeine on fetal development?

Probably none. Caffeine in moderation such as two cups of coffee a day is ok in pregnancy. The limited studies suggesting a negative relationship between caffeine intake and pregnancy were either done on animals who were given massive amounts of caffeine or on small numbers of actual patients wherre any real relationship was never conclusively shown.
Great question! Caffeine crosses the placenta and may have fetal effects - including proarrhythmic tendency in the fetal heart and untold consequences in fetal brain development. Consumption in moderation is not contraindicated during pregnancy, however studies are lacking to assess your excellent question, namely what effect that has on the infant's character and neurolodevelopmental outcome, if any.

What are the damaging effects of caffeine?

Caffeine. Caffeine possible side effects: nervousness, insomnia, restlessness, irritability feeling hyper, ringing in ears, rapid or irregular heart rate, nausea, vomiting, GI upset, shakiness, dizziness or allergic reaction. Symptoms of caffeine overdose may include: Restlessness, ^ heart rate, palpitations, nausea, vomiting, anxiety, insomnia, ^ sweating, dizziness & cardiac arrest.

What are the side effects of caffeine?

Caffeine. Side effects could be: Too much caffeine is not good for you. Why not start with just one coffee drink a day and see how things go well. If no problem - OK! If a problem, stop drinking caffeine!

What are the side effects of caffeine pills other than staying awake?

Same as coffee. Same side effects as caffeine. About 300 mg is enough to result in caffeine intoxication, with similar effects to other stimulants. Longer term, an anxiety disorder or a sleep disorder may develop from taking caffeine pills or tablets.

What are side effects of heavy caffeine use?

Lack of effect. Eventually u can drink coffee & go to sleep--if u withdraw from caffeine u are tired & get a headache if u stay off of caffeine for a period of time u unplug your receptors and coffee/caffeine will again stimulate u.