Does Guarana Cause Side Effects?
Guarana contains a large amount of caffeine (which is actually the active ingredient in guarana). Therefore, guarana can cause any of the side effects that are usually associated with caffeine consumption.
Common Side Effects of Guarana
Since guarana has not been adequately studied in clinical trials, all information on side effects comes from what is known about caffeine. Based on this information, common guarana side effects may include:
- Insomnia
- Nervousness
- Restlessness
- Indigestion or heartburn
- Nausea and vomiting
- Shakiness (tremor) or jitteriness
- Increased urination
- Headaches
- Ringing in the ears (tinnitus).
Some side effects with guarana, while occurring infrequently, are potentially serious and should be reported to your healthcare provider right away.
These include but are not limited to:
- High blood pressure (hypertension)
- A rapid heart rate (tachycardia)
- Rapid breathing or difficulty breathing
- Seizures
- Anxiety or agitation
- An irregular heart rhythm (arrhythmia)
- Feelings of a rapidly or forcefully beating heart (known as heart palpitations)
- Signs of an allergic reaction, such as unexplained rash, hives, itching, unexplained swelling, wheezing, or difficulty breathing or swallowing.
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