Passionflower

Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD — GMJ Editorial Board

What is Passionflower?

Passionflower (Passiflora incarnata) is a climbing vine native to the southeastern United States and Central America, traditionally used for its calming properties. The plant produces distinctive purple and white flowers and has been employed in herbal medicine for centuries to address anxiety, insomnia, and nervous tension. Passionflower belongs to the Passifloraceae family and is also known as maypop, purple passionflower, or wild passion vine. The aerial parts of the plant, including leaves, stems, and flowers, are typically used to create herbal extracts and teas.

Passionflower contains various bioactive compounds including flavonoids (particularly chrysin and vitexin), alkaloids, and phenolic acids that contribute to its therapeutic effects. The herb gained recognition in European traditional medicine and was officially listed in the National Formulary in the United States from 1916 to 1936 as a sedative.

Health benefits & uses

Anxiety reduction (Moderate evidence): Clinical studies suggest passionflower may help reduce symptoms of generalized anxiety disorder. Research indicates it may be as effective as some prescription anti-anxiety medications for mild to moderate anxiety, with fewer side effects.

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Sleep quality improvement (Moderate evidence): Studies show passionflower tea consumption may improve sleep quality and reduce the time needed to fall asleep. The herb appears to promote relaxation without causing significant drowsiness the following day.

Withdrawal symptom relief (Limited evidence): Some research suggests passionflower may help alleviate symptoms during withdrawal from substances like alcohol and opioids when used as part of comprehensive treatment programs.

Attention and focus (Limited evidence): Preliminary studies indicate passionflower might help improve attention and reduce hyperactivity in some individuals, though more research is needed to confirm these effects.

Pain management (Limited evidence): Traditional use and early studies suggest potential analgesic properties, but clinical evidence remains insufficient to support this application.

How it works

Passionflower’s calming effects are believed to result from its interaction with the gamma-aminobutyric acid (GABA) system in the brain. GABA is the primary inhibitory neurotransmitter that helps regulate nervous system activity and promotes relaxation. The herb’s flavonoids, particularly chrysin, may increase GABA activity by binding to benzodiazepine receptors, producing anxiolytic and sedative effects without the dependency potential of pharmaceutical benzodiazepines.

Additionally, passionflower contains compounds that may modulate serotonin levels and inhibit the enzyme that breaks down GABA, potentially extending its calming effects. The plant’s antioxidant properties may also contribute to its overall neuroprotective benefits.

Dosage

Typical adult dosing ranges vary depending on the form and intended use:

• Dried herb tea: 1-2 teaspoons (2-4g) steeped in hot water for 10-15 minutes, 1-3 times daily
• Liquid extract: 1-4 mL three times daily
• Standardized extract capsules: 250-500mg daily, typically divided into 2-3 doses
• Tincture (1:5 ratio): 2-4 mL three times daily

No official Recommended Dietary Allowance (RDA) or Upper Limit (UL) has been established for passionflower. Start with lower doses to assess individual tolerance. Consult a healthcare provider before beginning supplementation, especially for therapeutic purposes or if taking other medications.

Food sources

Passionflower is not commonly consumed as a food source in most cultures. The plant is primarily used medicinally through:

• Herbal teas and infusions
• Dietary supplements in capsule or tablet form
• Liquid extracts and tinctures
• Combination herbal formulas for sleep and relaxation

Some specialty health food stores may carry fresh or dried passionflower leaves for brewing tea. The passion fruit consumed as food comes from different Passiflora species and contains minimal amounts of the therapeutic compounds found in Passiflora incarnata.

Safety & side effects

Passionflower is generally well-tolerated when used appropriately. Most people experience no adverse effects, but some may notice:

• Mild drowsiness or dizziness
• Nausea or stomach upset
• Headache
• Rapid heart rate (rare)
• Allergic reactions in sensitive individuals

Avoid driving or operating machinery when first using passionflower, as it may cause drowsiness. Discontinue use if any unusual symptoms occur and consult a healthcare provider.

Interactions

Sedative medications: Passionflower may enhance the effects of sleep medications, benzodiazepines, and other central nervous system depressants, potentially causing excessive sedation.

Anticoagulant drugs: May increase bleeding risk when combined with warfarin or other blood-thinning medications.

Blood pressure medications: Could potentially enhance hypotensive effects of antihypertensive drugs.

Other calming supplements: May have additive effects when combined with valerian, kava, melatonin, or other relaxation-promoting herbs.

Always inform healthcare providers about passionflower use before medical procedures or when starting new medications.

Who should be cautious

Certain individuals should avoid or use passionflower with extra caution:

• Pregnant and breastfeeding women: Safety during pregnancy and lactation has not been established
• Children: Limited safety data available for pediatric use
• Surgery patients: Discontinue at least two weeks before scheduled procedures due to potential interactions with anesthesia
• Individuals with low blood pressure: May further reduce blood pressure
• Those with bleeding disorders: Could potentially increase bleeding risk

Frequently asked questions

How long does it take for passionflower to work?

Effects may be noticed within 30-90 minutes when taken as a tea or liquid extract. For anxiety management, consistent daily use for several weeks may be needed to achieve optimal benefits.

Can I take passionflower every day?

Short-term daily use (up to 8 weeks) appears safe for most adults based on available research. For longer-term use, consult with a healthcare provider to monitor effectiveness and safety.

Is passionflower habit-forming?

Unlike prescription anti-anxiety medications, passionflower does not appear to cause physical dependence or withdrawal symptoms when discontinued, making it a potentially safer option for long-term anxiety management.

Can passionflower help with panic attacks?

While passionflower may help with general anxiety, there is limited specific research on its effectiveness for acute panic attacks. It’s best used as part of a comprehensive approach to anxiety management under professional guidance.

What’s the difference between passionflower and passion fruit?

Passionflower extract comes from Passiflora incarnata and is used medicinally, while passion fruit comes from Passiflora edulis and is consumed as food. The fruit does not contain significant amounts of the therapeutic compounds found in the medicinal species.