Guarana

Be careful of

Cautions

• AmountGuarana contains caffeine and adds to a drink's total caffeine. FDA cites 400 milligrams of caffeine a day for most adults as an amount not generally linked to negative effects, and estimates that toxic effects such as seizures can follow rapid intake of around 1,200 milligrams. Count every source.
• AmountA 2014 case report described a man who developed atrial fibrillation after swallowing guarana extract tablets containing 1.6 grams of caffeine.
• NoteToo much caffeine can cause a fast or irregular heartbeat, raised blood pressure, anxiety, jitters, sleep problems, upset stomach, nausea and headache (FDA).
• ConditionChildren and teens: experts advise against energy drinks for them, and caffeine may harm their developing heart and nervous systems (FDA, NCCIH).
• InteractionMixing caffeinated drinks with alcohol can make people feel less drunk than they are while their coordination is just as impaired (NCCIH). Some medicines make people more sensitive to caffeine (FDA).
• PregnancyIf you are pregnant, trying to become pregnant or breastfeeding, FDA recommends asking your health care provider whether you need to limit caffeine.
• Ask a clinicianTalk with a clinician or pharmacist before using this if you take prescription medicines, are pregnant or breastfeeding, or are giving it to a child.