Caffeine or Coffee is a central nervous system stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. There are several known mechanisms of action to explain the effects of caffeine.

Caffeine consumption is generally considered safe, although habit-forming. Some side effects linked to excess intake include anxiety, restlessness, tremors, irregular heartbeat, and trouble sleeping. Too much caffeine may also promote headaches, migraines, and high blood pressure in some individuals.

Caffeine acts as a central nervous stimulant, people usually take it to feel more alert and energetic. Caffeine can improve mood and help people feel more productive. It is believed to work by blocking the neurotransmitter adenosine's receptors, increasing excitability in the brain.

EFFECTS:-

Caffeine is most commonly used to improve mental alertness, but it has many other uses. Caffeine is used by mouth or rectally in combination with painkillers (such as aspirin and acetaminophen) and a chemical called ergotamine for treating migraine headaches.

When consumed in moderation, coffee can be very good for your brain. However, when consumed late in the day, it may reduce the quality of your sleep and subsequently make you feel more tired. Moderation is key. When consumed in excess, caffeine can cause anxiety, jitters, heart palpitations, and sleep problems.

too much caffeine may be to blame. Caffeine comes with a burst of energy, which is what most of us use it for. However, that energy also stimulates our “fight or flight” hormones. This may cause an increase in anxiety, nervousness, heart palpitations, and even panic attacks.