Moreover, arrhythmia and muscle contraction exception is some serious side effects of passion fruits. Abnormal heart rhythm will increase the risk of heart attack, stroke and high blood pressure. If you have heart palpitations, you should immediately stop taking this herb and inform your doctor as soon as possible. Abnormal muscle contraction can occur on any muscle in your body including the heart muscle. Many studies have confirmed that passion fruit is very useful for patients suffering from anxiety disorders. However, in case of the persistent and curbing anxiety, you need to go to hospital to do some assessment and treatment. Solely relying on herb medicine is not a good choice.