Passionflower may cause dangerous side effects when taken with blood-thinner medications and an older class of antidepressant medication called monoamine oxidase inhibitors (MAOs). In totality, the passion flower reduces your muscle pains that can be caused by these seizures and also the frequency of these attacks. This tropical species of the passion flower family is the most poisonous plant in the world, according to the University of Berkeley. Although grand in appearance, passion flower plants pose a danger to canine companions. Having an outbreak of herpes in any form can be extremely dangerous. Whether a particular passion flower is poisonous to horses depends on the type of passion flower you'll use and how you'll administer it to horses. Some variants of passion flowers such as the P. caerulea and its hybrid are toxic; therefore, can be poisonous to horses. Herpes outbreak. The P. kermesina has a terrible taste while the P. trisecta contains toxins. Poisonous? Passion flower contradicts with anti-depressants, anxiety medications, sleep medications and flu medications like antihistamines. It is not known how to best treat a passion flower overdose. There are several types that vary in size and color. Other safety concerns: First of all don’t be overconcerned about the information here. Because passionflower may help lower blood pressure, caution is advised when using this herb with antihypertensive medications. These delicate tropical plants are favoured by gardeners for their showy flowers. This deters butterflies from laying eggs on what appears to be an already crowded leaf. 17. This climbing vine makes a tea used for insomnia and anxiety. Poisonous toxins in leaves. Its tuberous roots include a deadly mix of cyanide and a slower-acting poison unique to this plant. Thanks to Dr. Les King (Forensic Scientist) for his helpful comments re this section. Are Passion flowers and some Passion fruit toxic? Passiflora Incarnata. Treatment for a Passion Flower Overdose. Dangerous passion flower overdose symptoms are probably more likely if it is taken with any other sedative substances (including alcohol or sedative medications). Many garden plants are potentially poisonous and Passiflora or Passion flowers are far less so than most. It also contradicts with alcohol. Passion Flowers have subsequently evolved some defence mechanisms against herbivory by Heliconius butterflies and other insects. There are probably other medications that it contradicts with that I don't know about. These drugs will intensify and worsen passion flower side effects. Passion fruit is the fruit of the Passiflora vine, a type of passion flower. It has a tough outer rind and juicy, seed-filled center. However, passion flower can be used to provide you with some relief in the pain and discomfort. These defences against herbivory can include: Little nubs or yellow spots on leaves that look like butterfly eggs. 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