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Like coffee, tea or cocaine brazil-herb guarana is an effective stimulant of central nervous system. It contains 2.5 times more caffeine than coffee. Exactly caffeine is involved in production of alert state for a long time. The clear understanding of the way guarana acts by is impossible without detailed consideration of caffeine influence. Caffeine acts in two ways: 1) Being adenosine agonist it binds adenosine receptors in brain. As a result adenosine, which function is to slow down nerve impulses, can not do his work and nervous system remains excited for a long time. 2) Increases level of dophamine in brain. Dophamine is a substance which improves mood and feeling of well-being. Described above changes in brain caused by caffeine lead to increase of arterial tension and temperature, heart excitement, shortcut perception and boost in energy. Because of these properties guarana is used in tonic beverages. But the problem is that it’s good only for brief infrequent stimulation of nervous system. Products containing caffeine for nervous system are similar to a whip for the horse: in the end this doping exhausts nervous system very much. The consultation with the therapist before first guarana use is desirable. But it is necessary in the case you have heart disease, diabetes, overactive thyroid, kidney disease, anxiety disorders or a history of ulcers. The information about your relations with cigarettes (if you smoke or recently have stopped smoking) would also be useful for your doctor and for you finally. Be careful with guarana if you have any allergenic reactions (especially to plants). When all precautionary procedures are passed and you are ready to begin stimulation of your CNS with guarana remember about fatal dose of caffeine. Limit your consumption of other caffeine containing products (coffee, tea, chocolate). Guarana may have such side effects as insomnia, trembling, hyperactivity, urinary frequency, palpitation and anxiety, nausea, stomach upset, trouble sleeping, tremor, fast or irregular heartbeat, lost of appetite, heartburn, black stools or headache. As a rule all of them are brief and disappear after stop of use the irritator. Co-use of vitamin B may counteract some side-effects. Search for medical care demand more serious health problems: difficulty breathing; closing of the throat; chest pain; swelling of the lips, tongue or face. Enduring use of guarana may lead to cardiovascular disease, alteration of the blood sugar, decreased fertility and even several forms of cancer. Moreover it may cause anemia or other health problems in children. Having overdosing of Paullinia Cupana which usually is accompanied with such symptoms as agitation, irritability, tremors, painful urination, stomach cramps or vomiting, call emergency immediately. Notice also that guarana counteracts with alcohol, birth control pills, ephedrine, cimetidine, disulfiram, ciprofloxacin, enoxacin, theophylline, water pills (like furosemide) and other stimulants (such as phenylpropanolamine). The result of guarana interaction with anticoagulants is inhibition of platelet aggregation and increased risk of bleeding.
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