what is the effect of caffeine?

Answer 1

Caffeine is a bitter substance found in coffee, tea, soft drinks, chocolate, some nuts and certain medicines. It has many effects on the body's metabolism, including stimulating the central nervous system. This can make you more alert and give you a boost of energy.

For most people, the amount of caffeine in two to four cups of coffee a day is not harmful. However, too much caffeine can make you restless, anxious and irritable. It may also keep you from sleeping well and cause headaches, abnormal heart rhythms or other problems. If you stop using caffeine, you could get withdrawal symptoms.

Some people are more sensitive to the effects of caffeine than others. They should limit their use of caffeine. So should pregnant and nursing women. Certain drugs and supplements may interact with caffeine.

GENERIC NAME: NARCOTIC ANALGESIC/APAP/CAFFEINE/BUTALBITAL - ORAL

USES: This combination medication contains a narcotic pain reliever, acetaminophen (a non-aspirin pain reliever), caffeine and butalbital. Caffeine is used to enhance pain relief, especially in certain types of headaches. Butalbital provides a calming effect. This combination medication is used to relieve moderate to severe pain.

HOW TO USE: Take this by mouth with food or milk if stomach upset occurs. Take this medication exactly as prescribed. Do not increase the dose, take it more often than directed or continue taking this for longer than prescribed. This medication contains acetaminophen. Do not take more acetaminophen than recommended (see Side Effects section).

SIDE EFFECTS: Stomach upset, headache, blurred vision, constipation, drowsiness, dizziness or lightheadedness may occur. If any of these effects persist or worsen, inform your doctor. Notify your doctor immediately if you develop: rapid heart rate, fainting, breathing difficulties, mood changes, depression, irritability, nervousness. If you do not have liver problems, the adult maximum dose of acetaminophen is 4 grams per day (4000 milligrams). If you take more than the maximum daily amount, it may cause serious (possibly fatal) liver disease. Tell your doctor immediately if you have any of the following symptoms of liver damage: severe nausea, yellowing eyes or skin, dark urine, stomach pain, extreme fatigue. An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: rash, itching, swelling, severe dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.

Caffeine is used for:
Restoring mental alertness or wakefulness if you are experiencing fatigue or drowsiness. It may also be used for other conditions as determined by your doctor.

Caffeine is a central nervous system stimulant. It works by stimulating the brain.

Do NOT use Caffeine if:
you are allergic to any ingredient in Caffeine
Contact your doctor or health care provider right away if any of these apply to you.

Before using Caffeine :
Some medical conditions may interact with Caffeine . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

if you are pregnant, planning to become pregnant, or are breast-feeding
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
if you have allergies to medicines, foods, or other substances
if you have anxiety, liver problems, insomnia (trouble sleeping), or heart disease
Some MEDICINES MAY INTERACT with Caffeine . Tell your health care provider if you are taking any other medicines, especially any of the following:

Quinolones (eg, ciprofloxacin) because side effects such as problems sleeping, nervousness, jitteriness, or anxiety may occur
Theophylline because its actions and side effects may be increased
This may not be a complete list of all interactions that may occur. Ask your health care provider if Caffeine may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
How to use Caffeine :
Use Caffeine as directed by your doctor. Check the label on the medicine for exact dosing instructions.

Caffeine may be taken with or without food.
Do not exceed the recommended dose or take Caffeine on a regular basis without checking with your doctor. Exceeding the recommended dose or taking Caffeine regularly may be habit-forming.
If you miss a dose of Caffeine and you are taking it regularly, take it as soon as possible. If several hours have passed or if it is nearing time for the next dose, do not double the dose to catch up, unless advised by your health care provider. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use Caffeine .

Important safety information:
Caffeine may cause dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to Caffeine . Using Caffeine alone, with certain other medicines, or with alcohol may lessen your ability to drive or perform other potentially dangerous tasks.
Avoid large amounts of caffeine-containing foods and beverages, such as coffee, tea, cocoa, cola drinks, and chocolate. This includes any medicines that contain caffeine.
Caffeine is not to be used as a substitute for sleep.
Diabetes patients - Caffeine may affect your blood sugar. Check blood sugar levels closely and ask your doctor before adjusting the dose of your diabetes medicine.
Caffeine is not recommended for use in CHILDREN younger than 12 years of age. Safety and effectiveness in this age group have not been confirmed.
PREGNANCY and BREAST-FEEDING: If you become pregnant while taking Caffeine , discuss with your doctor the benefits and risks of using Caffeine during pregnancy. It is unknown if Caffeine is excreted in breast milk. If you are or will be breast-feeding while you are using Caffeine , check with your doctor or pharmacist to discuss the risks to your baby.
When used for long periods of time or at high doses, some people develop a need to continue taking Caffeine . This is known as DEPENDENCE or addiction.

If you suddenly stop taking Caffeine , you may experience WITHDRAWAL symptoms including dizziness, headache, unusual tiredness, irritability, muscle tension, or nausea.

Possible side effects of Caffeine :
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Dizziness; irritability; nausea; nervousness.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); diarrhea; shakiness; trouble sleeping; vomiting.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider. You may report side effects to the FDA at 1-800-FDA-1088 (1-800-332-1088) or at http://www.fda.gov/medwatch.

If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (http://www.aapcc.org/findyour.htm), or emergency room immediately. Symptoms may include agitation; anxiety; confusion; frequent urination; irregular or fast heartbeat; muscle twitching; ringing in the ears; seizures; stomach pain; trouble sleeping.

Proper storage of Caffeine :
Store Caffeine at room temperature, between 59 and 86 degrees F (15 and 30 degrees C), in a tightly closed container. Store away from heat, moisture, and light. Do not store in the bathroom. Keep Caffeine out of the reach of children and away from pets.

General information:
If you have any questions about Caffeine , please talk with your doctor, pharmacist, or other health care provider.
Caffeine is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.
This information is a summary only. It does not contain all information about Caffeine . If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

Answer 2

When I switched from coffee to a natural and healthy energy drink I experienced a headache for a day maybe two but then it was over and I feel great now (even lost a few pounds) and have lot's of get up and go without the caffeine

Answer 3

Caffeine is a central nervous system (CNS) stimulant, having the effect of temporarily warding off drowsiness and restoring alertness. Beverages containing caffeine, such as coffee, tea, soft drinks and energy drinks enjoy great popularity; caffeine is the world's most widely consumed psychoactive substance, but unlike most other psychoactive substances, it is legal and unregulated in nearly all jurisdictions.

Answer 4

Caffiene is a natural psychoactive drug which you can find in in the leaves and beans of the coffee plant, in tea, yerba mate, and guarana berries, the kola nut, the Yaupon Holly, and in small quantities in cocoa. Caffeine has effect to raise the blood pressure and thus stimulate our body. Hence after consuming them, usually we feel alert and awake.

This is a Xanthine derivative alkaloid ( (3,7-dihydro-purine-2,6-dione, which is a purine base found in most body tissues and fluids and in other organisms). Caffeine is a central nervous system (CNS) stimulant, having the effect of temporarily warding off drowsiness and restoring alertness.

Caffeine acts through multiple mechanisms involving both action on receptors and channels on the cell membrane, as well as intracellular action on calcium and cAMP pathways. By virtue of its purine structure it can act on some of the same targets as adenosine related nucleosides and nucleotides, like the cell surface P1 GPCRs for adenosine, as well as the intracellular Ryanodine receptor which is the physiological target of cADPR (cyclic ADP ribose), and cAMP-phosphodiesterase (cAMP-PDE). Although the action is agonistic in some cases, it is antagonistic in others. Physiologically, however, caffeine action is unlikely due to increased RyR opening, as it requires plasma concentration above lethal dosage. The action is most likely through adenosine receptors.

Answer 5

I Like Whites's Answer, but, if I Remember Correctly, its Mechanism is Primarily to Raise Intracellular cAMP, a PDE1 Inhibitor.

Answer 6

Stimulate the respiratory center in brain, stimulate stomach secretion, keep you awoke, increase pulse rate, over-dosage cause tremor, irritation, arrhythmia...

Answer 7

Keeps you awake and gives you energy!