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About - Caffeine

By mouth: Keeps you mentally alert.

Oral route: Caffeine tablets are used as an alertness aid to help you keep awake when you experience drowsiness or unusual tiredness or weakness.

UsesSide effectsLatest evidence reviewsResearch summaries for consumersBrand names

Heart Palpitations

Palpitations are feelings that your heart is skipping a beat, fluttering, or beating too hard or too fast.

Diseases and Conditions - Updated: June 11, 2014

Insomnia

Insomnia is a common condition in which you have trouble falling asleep, staying asleep, or both. This condition can range from mild to severe, depending on how often it occurs and for how long.

Diseases and Conditions - Updated: June 11, 2014

Sleep Deprivation and Deficiency

Sleep deprivation in a condition that occurs if you don't get enough sleep. Sleep deficiency is a broader concept.

Diseases and Conditions - Updated: June 11, 2014

Raynaud's

Raynaud's is a rare disorder that affects the arteries. Arteries are blood vessels that carry blood from your heart to different parts of your body.

Diseases and Conditions - Updated: June 11, 2014

Atrial Fibrillation

Atrial fibrillation, or AF, is the most common type of arrhythmia. An arrhythmia is a problem with the rate or rhythm of the heartbeat.

Diseases and Conditions - Updated: June 11, 2014

Narcolepsy

Narcolepsy is a disorder that causes periods of extreme daytime sleepiness. It also may cause muscle weakness.

Diseases and Conditions - Updated: June 11, 2014

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm.

Diseases and Conditions - Updated: June 11, 2014

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