To this day caffeine is naturally present in more than 60 plants and contained in many foodstuffs such as coffee, tea and chocolate. One of caffeine’s primary sites of action in the human body is its stimulating effect on cognitive functions. [energydrink.redbull.com]

Hplc Was Used To Quantify The Caffeine Present In Various Samples Of Guarana and Its Products. The Amount Of Caffeine Present Was Found To Be Between 2.0 and 4.5% W/W Which Is Of The Same Order As That Present In Tea and Coffee. [doi.org]

At the ED, she presented an episode of presyncope followed by agitation. ECG showed polymorphic broad complex QRS tachycardia and arterial blood gas revealed metabolic acidaemia with severe hypokalemia. [ncbi.nlm.nih.gov]

• Fatigue

  Acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue in recreationally active men. [ncbi.nlm.nih.gov]

  Acute caffeine abstinence also produced changes in EEG (increased theta rhythm) that has previously been linked to the common withdrawal symptom of fatigue. [eurekalert.org]

  Regular ingestion of the drug alters your brain’s chemical makeup, leading to fatigue, headaches and nausea if you try to quit Regular caffeine use alters your brain’s chemical makeup, leading to fatigue, headaches and nausea if you try to quit. [smithsonianmag.com]

• Weight Loss

  Zantrex - 3™ is advertised as a weight loss supplement which may provide rapid weight loss and extreme energy in one "power packed pill." After discontinuation of Zantrex - 3™, the patient experienced no further seizure activity. [ncbi.nlm.nih.gov]

  From Does caffeine help with weight loss? The weight-loss industry is estimated to be a $50 billion a year industry. [medicinenet.com]

• Vomiting

  He was vomiting a great deal and could not move, so his family had him lay down to rest. That afternoon they discovered his death. Although the decedent was examined by postmortem computed tomography, his cause of death could not be determined. [ncbi.nlm.nih.gov]

  MAY CAUSE HEADACHE, INSOMNIA, NAUSEA, VOMITING, STOMACH PAIN, COLLAPSE AND CONVULSIONS... [chm.bris.ac.uk]

  These symptoms can include: headache marked Fatigue or drowsiness dysphoric, depressed mood or irritability difficulty Concentrating flu-like symptoms (nausea, vomiting or muscle pain/stiffness).7 [adf.org.au]

  The man, who worked midnight to dawn at a 24-hour gasoline station, had vomited on multiple counts in the year leading up to his death; Japan Times reports such vomiting can signal caffeine intoxication. [newser.com]

• Diarrhea

  Vol. 13, Pg. 791, 1979. rabbit LD50 oral 224mg/kg (224mg/kg) GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA" Toxicology and Applied Pharmacology. [chem.nlm.nih.gov]

  In mild poisoning, the most prevalent symptoms are nausea, vomiting, diarrhea, tremor, anxiety and headache. In more severe cases, symptoms consist of heart rythym abnormalities, myocardial infarction and seizures. [ncbi.nlm.nih.gov]

  People may experience dizziness, hypoglycemia, fruit-like breath odor, troubled breathing, muscle tremors, nausea, diarrhea, increased urine, ketones in urine,drowsiness, thirst, anxiety, confusion, irritability, insomnia, changes in appetite, dry mouth [uhs.umich.edu]

  Side effects of caffeine consumption include thirst, anxiety, insomnia, irritability, blurry vision, dry mouth, clamminess, sweat production, increased blood sugar and urination, respiratory distress, rapid heartbeats and diarrhea. [livestrong.com]

  Diarrhea: Caffeine, especially when taken in large amounts, can worsen diarrhea. Epilepsy: People with epilepsy should avoid using caffeine in high doses. Low doses of caffeine should be used cautiously. [webmd.com]

• Constipation

  Some symptoms of caffeine withdrawal include headaches, irritability, nervousness, nausea, constipation and muscular tension. [uhs.umich.edu]

  Though more research is needed, studies have indicated that caffeine could both precipitate and alleviate headache, boost athletic performance and memory, protect against type 2 diabetes, prevent constipation, and exacerbate menopausal hot flashes. 4. [consumerreports.org]

  May Be Useful In Treatment Of: ALIMENTARY CANAL: Cancer, Constipation, Indigestion (dyspepsia), Ulcer (duodenal and peptic). [web.archive.org]

  The high tannin content of tea, on the other hand, is apt to cause constipation." 17 When taken in very large doses, moreover, caffeine is a potent poison. "A fatal dose of caffeine given to an animal," Dr. [druglibrary.org]

  Many patients with nOH also have autonomic failure resulting in constipation and anhidrosis, so these side effects may be salutary for some patients. [doi.org]

• Tachycardia

  Atrial tachycardia time from a Holter recording was 44.2 minute/day before the caffeine load, compared with 215.2 minute/day during the caffeine load. [ncbi.nlm.nih.gov]

• Palpitations

  It used to be believed that premature cardiac contractions, which usually cause no symptoms or mild symptoms such as heart palpitations, ‘skipped’ beats or fluttering, were harmless. [nbcnews.com]

  "If it's red-colored and it's sweet, kids might take three, four or five of them and go into an anxiety attack and palpitations," he said. "Kids get anxious when they take caffeine and it could put them over the top." [abcnews.go.com]

  Heart Palpitations Caffeine stimulates the central nervous system. It speeds up the heart rate and can cause the heart to flutter or palpitate. Energy drinks: health risks and toxicity 8. [inc.com]

  Of these energy drink users, 29 percent reported "weekly jolt and crash episodes," and 19 percent reported heart palpitations from drinking energy drinks. [sciencedaily.com]

  Short-Term Effects of Caffeine Raised blood pressure Trouble sleeping (insomnia) Frequent urination Long-Term Caffeine Health Risks Heart palpitations or other heart problems Mental health changes On the other hand, Brown says some evidence suggests caffeine [unitypoint.org]

• Irregular Heart Rhythm

  heart rhythms Have high blood pressure Take certain medicines or supplements, including stimulants, certain antibiotics, asthma medicines, and heart medicines. [nlm.nih.gov]

  The report challenges a widely held belief that caffeinated drinks cause irregular heart rhythms that can lead to heart failure or dangerous heart rhythm disorders and is another vindication for coffee as a safe drink. [nbcnews.com]

  In most people, there is no long-term effect on blood pressure, but if you have irregular heart rhythms, caffeine may make your heart work harder. [healthline.com]

• Orthostatic Hypotension

  Neurogenic orthostatic hypotension. N Engl J Med 358(6):615–624 CrossRef PubMed Google Scholar 7. Low PA, Singer W (2008) Management of neurogenic orthostatic hypotension: an update. [doi.org]

  hypotension, and for the short term treatment of apnea of prematurity in infants. [drugbank.ca]

  Orthostatic hypotension treatment. Some people use caffeine-containing beverages such as coffee or tea to try to treat their asthma. Evidence to support this practice, however, is poor. [en.wikipedia.org]

• Halitosis

  Foosh energy mints have 5,555 mg of caffeine per 100g - that’s 139 cups of coffee (and, we assume, without the halitosis). Buzz Bites Chocolate Chews were the second highest on the adult sweeties list with 1,639mg of caffeine per 100g. [theguardian.com]

• Bruxism

  Marcin Berger, Monika Litko, Michał Ginszt, Hassan Alharby, Jacek Szkutnik, Piotr Majcher and Jolanta Szymańska, Use of common stimulants and awake bruxism – a survey study, Polish Journal of Public Health, 126, 3, (2016). [dx.doi.org]

• Xerostomia

  Morita, Relationship between xerostomia and gingival condition in young adults, Journal of Periodontal Research, 50, 1, (74-79), (2014). Matthew A. Tucker, Matthew S. Ganio, J. D. Adams, Lemuel A. Brown, Christian B. Ridings, Jenna M. [doi.org]

• Muscle Twitch

  twitching, rambling flow of thought and speech, tachycardia or cardiac arrhythmia, periods of inexhaustibility or psychomotor agitation (unintentional motion, say, rapidly bouncing one leg). [newsfeed.time.com]

  Muscle Twitches and Spasms A high volume or prolonged use of caffeine in the body can cause the muscles to cramp or move erratically. Energy drinks: health risks and toxicity 6. [inc.com]

  twitching, rambling flow of thought and speech, tachycardia or cardiac arrhythmia, periods of inexhaustibility, or psychomotor agitation. [draxe.com]

  Symptoms of overdose may include agitation; anxiety; confusion; frequent urination; irregular or fast heartbeat; muscle twitching; ringing in the ears; seizures; stomach pain; trouble sleeping. [drugs.com]

  It can also cause flushed face, increased urination, muscle twitching and agitation. Some people feel these effects even with a very small amount (in some people as little as 250 mg, or two cups of coffee a day). [camh.ca]

• Muscle Cramp

  More toxic effects such as nausea, vomiting, muscle cramps, twitching and agitation may occur when a child consumes more than 4.5 mg of caffeine per pound of body weight. [dailymail.co.uk]

• Sweating

  Too much caffeine may also lead to anxiety-related feelings such as excessive nervousness, sweating and tremors. [uhs.umich.edu]

  Toxic manifestations included hypertonia, sweating, tachycardia, cardiac failure, pulmonary oedema and metabolic disturbances (metabolic acidosis, hyperglycaemia and creatine kinase elevation). [ncbi.nlm.nih.gov]

  It's sweat-proof and hypo-allergenic. But it's what's on the inside that counts. The user attaches an adhesive patch made with guarana extract, which has twice the caffeine concentration as coffee beans. [techinsider.io]

  Side effects of caffeine consumption include thirst, anxiety, insomnia, irritability, blurry vision, dry mouth, clamminess, sweat production, increased blood sugar and urination, respiratory distress, rapid heartbeats and diarrhea. [livestrong.com]

  These symptoms can include: headache fatigue (tiredness, lethargy) drowsiness (sleepiness, yawning) nausea depression difficulty concentrating inability to think clearly irritability anxiety sweating muscle pains and weakness. [positivechoices.org.au]

• Flushing

  If you’ve had more than 250 mg of caffeine (two to three cups of brewed coffee) and experienced five or more of the following symptoms, says the guide, you’ve probably been caffeine-buzzed: restlessness, nervousness, excitement, insomnia, flushed face [newsfeed.time.com]

  As a class of drugs, Methylated xanthines cause central nervous system (CNS) stimulation, diuresis (flushing of fluids through the body), cardiac (heart) muscle stimulation, & smooth muscle stimulation. [web.archive.org]

  Water also naturally flushes caffeine from your body and keeps you hydrated. If you are a coffee drinker, gradually switch from regular coffee to decaf. [my.clevelandclinic.org]

  But hours later, he was flushed, lost his equilibrium and became nauseated. "He lay down on the couch, not asleep, but acting comatose and that night it really kicked in and he needed a bucket by the side of his bed," his wife said. [abcnews.go.com]

  It can also cause flushed face, increased urination, muscle twitching and agitation. Some people feel these effects even with a very small amount (in some people as little as 250 mg, or two cups of coffee a day). [camh.ca]

• Fear

  Energy drinks Not even once, because you will take a sip, gag, then spend the rest of the day nauseated and irrationally fearful of pencil erasers. Or so I've heard. [marieclaire.com]

  His death has sparked fears about the dangers of selling the mints alongside sweets which are popular with children. [telegraph.co.uk]

  Caffeine – A Sci-Fi Horror Game Caffeine is a quirky psychological horror adventure game with an atmosphere heavily inspired by games like Condemned, FEAR and Outlast. [incandescentimaging.net]

  The following chart includes common caffeinated products and the amounts of caffeine they contain: Drink/Food/ Supplement Amt. of Drink/Food Amt. of Caffeine SoBe No Fear 8 ounces 83 mg Monster energy drink 16 ounces 160 mg Rockstar energy drink 8 ounces [kidshealth.org]

• Anxiety Disorder

  Caffeine toxicity remains a rarely reported condition, which may mimic anxiety disorders. Anxiety disorder patients do not consume toxic amounts of caffeine. [ncbi.nlm.nih.gov]

  CrossRef Google Scholar × Volume 19, Issue 1 February 1989, pp. 211-214 Synopsis Caffeine toxicity remains a rarely reported condition, which may mimic anxiety disorders. Anxiety disorder patients do not consume toxic amounts of caffeine. [doi.org]

• Euphoria

  When taken in low to moderate doses, positive caffeine effects can include alertness, mild euphoria and better cognitive performance (e.g. concentration, problem solving). [sleephealthfoundation.org.au]

  Alcohol, heroin and short-acting barbiturates (pentobarbital) get top billing by this standard. (3) Another way is to assess how strongly the person wants to repeat the drug experience as a result of euphoria, confidence, sensuality, novelty, and so forth [rgable.net]

  Many of caffeine’s effects, including fat burning, strength benefits, and euphoria, are subject to tolerance, and may not occur in people used to caffeine, no matter how large the dose is. [examine.com]

  “Whereas low-dose caffeine effects are wakefulness, a little bit of arousal, and slight euphoria,” Fredholm says, “high-dose effects are anxiety, irritation, and general mental discomfort—a completely different kettle of fish.” [cen.acs.org]

• Urinary Incontinence

  Lee, Green tea drinking is inversely associated with urinary incontinence in middle‐aged and older women, Neurourology and Urodynamics, 30, 7, (1262-1265), (2011). C. [doi.org]

  Nevertheless, individuals with various conditions such as generalized anxiety disorder, panic disorder, primary insomnia, gastroesophageal reflux, pregnancy and urinary incontinence are often advised to reduce or eliminate regular caffeine use. [web.archive.org]

  If you have urinary incontinence, you may experience a greater "urgency" to urinate after consuming a caffeinated beverage. You will need to monitor your reaction and tolerance to caffeine to determine how you are affected. [medicinenet.com]

  Clinical signs of theobromine toxicity in canids usually manifest 8 hours after ingestion and can include: thirst, vomiting, diarrhea, urinary incontinence, nervousness, clonic muscle spasms, seizures and coma. [faqs.org]

• Urinary Urgency

  This may be due to voluntary restriction of intake for self-management of common conditions causing urinary urgency and urinary frequency including benign prostatic hyperplasia (BPH), overactive bladder, neurogenic bladder, stress incontinence or similar [doi.org]

• Nocturia

  Supine hypertension commonly leads to a pressure diuresis that occurs resulting in nocturia and blood volume depletion overnight. This nocturnal forced diuresis can be decreased by elevating the head of the bed. [doi.org]

• Headache

  A headache log or diary helps to determine if resuming caffeine leads to more headaches. It is important to emphasize that caffeine consumption is rarely the sole “cause” of frequent headaches including migraine. [achenet.org]

  Test your personal response to caffeine: If it gives you headaches, avoid it. These healthy habits can help keep migraines at bay. [joybauer.com]

  Caffeine and rebound headache (medication overuse headache) Rebound headache is a condition that develops from the overuse or misuse of any headache medicine, including those that have caffeine. Medicines that contain caffeine can be beneficial. [my.clevelandclinic.org]

  Abstract Caffeinated headache medications, either alone or in combination with other treatments, are widely used by patients with headache. [ncbi.nlm.nih.gov]

• Insomnia

  Caffeine intake and insomnia levels were measured using the Modified Caffeine Consumption Questionnaire and the Pittsburgh Insomnia Rating Scale (PIRS) in 130 clinically stable participants who were living with HIV, taking antiretroviral therapy, and [ncbi.nlm.nih.gov]

  Some examples of the side effects of excessive caffeine intake include difficulty concentrating, insomnia, muscle tremors, fast heartbeat, jitteriness, heartburn, nervousness, stomach upset and irritability. [news-medical.net]

  People who take medications for depression, anxiety or insomnia, high blood pressure, other heart problems, chronic stomach upset or kidney disease should limit caffeine until discussing the matter with a clinician. [uhs.umich.edu]

  If you do eat or drink too much caffeine, it can cause health problems, such as Restlessness and shakiness Insomnia Headaches Dizziness Rapid or abnormal heart rhythm Dehydration Anxiety Dependency, so you need to take more of it to get the same results [nlm.nih.gov]

• Seizure

  Further research is required to elucidate the effect of these variables on seizure duration. [ncbi.nlm.nih.gov]

• Tremor

  Too much caffeine may also lead to anxiety-related feelings such as excessive nervousness, sweating and tremors. [uhs.umich.edu]

  On the other hand, high doses can cause noticeable signs of mental confusion and error induction in intellectual tasks, anxiety, restlessness, muscle tremors, tachycardia, labyrinthine changes, and tinnitus. [ncbi.nlm.nih.gov]

  Call an ambulance straight away by dialling triple zero (000) if you experience any of the following effects. tremors nausea and vomiting very fast and irregular heart rate confusion and panic attack seizures.5 It’s possible to die from having too much [adf.org.au]

• Excitement

  Supplements containing caffeine showed increased feelings of attention, excitement, energy, and vigor. [ncbi.nlm.nih.gov]

  INHALATION CAUSES RAPID HEART RATE, EXCITEMENT, DIZZINESS, PAIN, COLLAPSE, HYPOTENSION, FEVER, SHORTNESS OF BREATHE. MAY CAUSE HEADACHE, INSOMNIA, NAUSEA, VOMITING, STOMACH PAIN, COLLAPSE AND CONVULSIONS... [chm.bris.ac.uk]

  Breakfast foods like eggs, bacon, waffles, and donuts open a whole world of exciting beer pairings where coffee beers feel especially at home. [epicbrewing.com]

  If you have a budding artist in your household, it’s time to dig out the crayons to take part in an exciting new project More Info My Voice A confidential and anonymous forum #MyVoice As a Canadian Armed Forces family member, you can participate in MyVoice [cg.cfpsa.ca]

• Hypoglycemia

  People may experience dizziness, hypoglycemia, fruit-like breath odor, troubled breathing, muscle tremors, nausea, diarrhea, increased urine, ketones in urine,drowsiness, thirst, anxiety, confusion, irritability, insomnia, changes in appetite, dry mouth [uhs.umich.edu]

  […] including blurred vision, drowsiness, dry mouth, flushed dry skin, fruit-like breath odor, increased urination, ketones in urine, loss of appetite, nausea, stomachache, tiredness, troubled breathing, unusual thirst, or vomiting (in newborn babies); hypoglycemia [web.archive.org]

  […] depressed patients. a GI Effects Chronic administration in animals associated with gastric ulceration; causal relationship in humans not adequately established. a Use with caution in patients with history of peptic ulcer. a Blood Glucose Abnormalities Hypoglycemia [drugs.com]

• Hyperglycemia

  Laboratory tests revealed hypokalemia, hyperglycemia, leukocytosis, as well as elevated creatinine and creatine phosphokinase levels. Approximately 45 h post ingestion, the patient developed atrial fibrillation with fast ventricular rhythm. [ncbi.nlm.nih.gov]

  Check with your doctor as soon as possible if any of the following side effects occur: More common Diarrhea; dizziness; fast heartbeat; hyperglycemia, including blurred vision, drowsiness, dry mouth, flushed dry skin, fruit-like breath odor, increased [web.archive.org]

  […] a GI Effects Chronic administration in animals associated with gastric ulceration; causal relationship in humans not adequately established. a Use with caution in patients with history of peptic ulcer. a Blood Glucose Abnormalities Hypoglycemia and hyperglycemia [drugs.com]

  Santos, Effect of Diabetes/Hyperglycemia on the Rat Retinal Adenosinergic System, PLoS ONE, 10.1371/journal.pone.0067499, 8, 6, (e67499), (2013). Ana C. Rodrigues-Neves, Inês D. Aires, Joana Vindeirinho, Raquel Boia, Maria H. Madeira, Francisco Q. [dx.doi.org]

Many combinations of caffeine concentration and duration produced comparable results; however, treatment with 3 g∙L−1 for 24 h was the most effective caffeine treatment on the basis of the number of seeds recovered, as well as the size and incidence of [ncbi.nlm.nih.gov]

Many combinations of caffeine concentration and duration produced comparable results; however, treatment with 3 g∙L −1 for 24 h was the most effective caffeine treatment on the basis of the number of seeds recovered, as well as the size and incidence [doi.org]

DSRCT remains an aggressive malignancy, with a poor prognosis despite multi-modality treatments. In the published literature, there has been no patient who lived for three years or more without surgical excision. [ncbi.nlm.nih.gov]

Outcome at 5 years of age of children 23 to 27 weeks’ gestation: refining the prognosis. Pediatrics 2001;108:134–141. [doi.org]

This pattern was present for both Alzheimer’s disease–related dementia and cerebrovascular disease etiologies, and persisted in analyses restricted to nonsmokers. [ajrccm.atsjournals.org]

The role of hormone use in PD etiology and its potential influence on the caffeine-PD relation should be further explored with larger sample sizes in the future. [doi.org]

Almost all the congenital malformation epidemiology studies were negative. [ncbi.nlm.nih.gov]

Epidemiology 7, 250 – 255. 42. Fenster, L, Hubbard, AE, Swan, SH et al. ( 1997 ) Caffeinated beverages, decaffeinated coffee, and spontaneous abortion. Epidemiology 8, 515 – 523. 43. [doi.org]

Bracken Professor and Head Chronic Disease Epidemiology Department Yale University School of Medicine Marilyn E. [web.archive.org]

Google Scholar | Crossref | Medline | ISI Morelli, M, Carta, AR, Kachroo, A. ( 2010 ) Pathophysiological roles for purines: Adenosine, caffeine and urate. Progress in Brain Research 183: 183 – 208. [doi.org]

McDermott, Neuroimaging with magnetoencephalography: A dynamic view of brain pathophysiology, Translational Research, 10.1016/j.trsl.2016.01.007, 175, (17-36), (2016). Mohsin H.K. Roshan, Amos Tambo and Nikolai P. [dx.doi.org]

The mechanism of action of caffeine on prevention of apnea and activation of breathing seems to be through central inhibition of adenosine receptors. [ncbi.nlm.nih.gov]

Community Preventive Services Task Force. The Guide to Community Preventive Services. Excessive Alcohol Consumption website. https://www.thecommunityguide.org/topic/excessive-alcohol-consumptionExternalexternal icon. Accessed February 4, 2020. [cdc.gov]