As a common herbal medicine, passion fruit has some common side effects if taken a large amount such as nausea etc. You should immediately stop taking them if the symptoms persist. The general usage of passion fruit is to treat anxiety, insomnia, pain and high blood pressure. Moreover, mild inflammation of skin can also be relieved via taking the passion fruit. As with other health products, you should consult your doctor before taking any herbal stuff as a medicine. Other side effects of this herb include confusion and some memory disorders. Also, some people may have some other disorders like stroke, dementia etc.