Herb

    Passionflower

    Passiflora incarnata

    TL;DR

    Passionflower is a mild GABAergic sedative with small trials supporting reduced pre-operative anxiety and modestly improved sleep quality at 300-800 mg extract or a strong tea before bed. It is gentle, non-habit-forming, and considerably less potent than pharmaceutical options.

    Ideal For

    • Adults with situational or anticipatory anxiety
    • People with mild difficulty falling asleep
    • Those wanting a non-habit-forming alternative to occasional sedatives
    • People sensitive to the heaviness of valerian

    Avoid If

    • You are pregnant — it may stimulate uterine contractions
    • You are breastfeeding
    • You take benzodiazepines, sedatives or drink alcohol in the evening
    • You take MAO inhibitors
    • You have surgery scheduled within two weeks
    • You need to drive or operate machinery shortly after dosing

    Frequently Asked Questions

    Overview

    Passiflora incarnata has been used as a calming herb since long before anyone identified its constituents, which include the flavonoids vitexin, isovitexin and chrysin, plus small amounts of harmala alkaloids. The mechanism most consistently supported is modulation of GABA-A receptors and inhibition of GABA reuptake — a benzodiazepine-adjacent pathway, but far weaker and without the tolerance and dependence problems.

    Human trials are small but reasonably designed. In pre-operative anxiety, 500 mg of extract or 260 mg of dry extract given 30-90 minutes before surgery reduced anxiety scores comparably to midazolam while causing less sedation and no delay in psychomotor recovery — the most convincing dataset the herb has. In generalised anxiety disorder, a four-week trial found passionflower comparable to oxazepam with fewer effects on job performance, though the sample was tiny. Sleep studies show modest gains in subjective sleep quality and polysomnographic sleep efficiency, with a low-dose tea trial producing small but statistically significant improvement in healthy adults.

    Set expectations accordingly. This is a mild agent suited to situational anxiety and light sleep disturbance, not a treatment for panic disorder or chronic insomnia. It is frequently combined with valerian and lemon balm, and those combination products often have better data than passionflower alone. Because of the GABAergic effect it adds to alcohol, benzodiazepines and other sedatives, and it should be stopped before surgery unless being used deliberately in that setting.

    How It Works

    • Modulates GABA-A receptors, increasing inhibitory neurotransmission
    • Inhibits GABA reuptake, raising synaptic GABA availability
    • Chrysin acts as a partial ligand at the benzodiazepine binding site
    • Vitexin and isovitexin contribute antioxidant and anxiolytic activity
    • Weak monoamine oxidase inhibition from trace harmala alkaloids
    • Reduces sleep-onset latency and increases slow-wave sleep in animal models

    Quick Facts

    • Reduces anxiety and promotes calm
    • Supports healthy sleep patterns
    • May help with nervous tension
    • Traditionally used for relaxation
    • Works well combined with other calming herbs

    Benefits & Outcomes

    Stress Resilience

    Mood
    Mixed evidence
    Moderate Evidence

    Passionflower shows modest acute anxiolytic effects in small clinical settings.

    Improved Sleep Quality

    Sleep
    Mixed evidence
    Moderate Evidence

    Small trials suggest passionflower mildly improves sleep quality, with effects short of pharmaceutical hypnotics.

    Mood Stabilization

    Mood
    Insufficient evidence
    Moderate Evidence

    Anxiolytic signal exists but mood-specific evidence is thin.

    Health Concerns Addressed

    No linked health concerns yet.

    Supporting Research
    6 studies

    Passiflora for anxiety disorder

    Score: 8/10
    2007
    meta_analysis
    n=198

    Miyasaka LS, Atallah AN, Soares BG

    Evidence from the few eligible trials was insufficient to judge whether passionflower helps anxiety disorders.

    View source

    Effect of Passiflora incarnata on sleep and anxiety: a systematic review of randomized controlled trials

    Score: 6/10
    2020
    systematic_review

    Janda K, Wojtkowska K, Jakubczyk K

    Passionflower showed modest anxiolytic and sleep-promoting effects across heterogeneous trials.

    View source

    Preoperative oral Passiflora incarnata reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study

    Score: 6/10
    2008
    rct
    n=60

    Movafegh A, Alizadeh R, Hajimohamadi F

    Preoperative Passiflora reduced anxiety without prolonging recovery or causing sedation.

    View source

    Efficacy of a herbal combination containing Passiflora incarnata for insomnia: a randomized, double-blind, placebo-controlled trial

    Score: 6/10
    2020
    rct
    n=110

    Lee J, Jung HY, Lee SI +2 more

    A valerian and passionflower combination improved insomnia severity and sleep efficiency versus placebo.

    View source

    Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam

    Score: 5/10
    2001
    rct
    n=36

    Akhondzadeh S, Naghavi HR, Vazirian M

    Passionflower was as effective as oxazepam for generalized anxiety with less job-performance impairment.

    View source

    A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality

    Score: 5/10
    2011
    crossover
    n=41

    Ngan A, Conduit R

    Passionflower tea improved subjective sleep quality with no change in objective sleep measures.

    View source

    Safety Information

    Potential Side Effects

    Generally safe. May cause drowsiness. Avoid with sedative medications. Not recommended during pregnancy.

    Contraindications

    Pregnancy, lactation, concurrent sedative or alcohol use, MAO inhibitor therapy, and the two weeks before scheduled surgery.

    Drug Interactions

    • Benzodiazepines and Z-drugs — additive sedation
    • Alcohol — additive central nervous system depression
    • MAO inhibitors — harmala alkaloids may interact
    • Anticoagulants — theoretical additive bleeding risk
    • Antihypertensives — possible additive blood pressure lowering
    • Anaesthetics — potentiated sedation

    Pregnancy & Breastfeeding

    Pregnancy: likely_unsafe

    Breastfeeding: insufficient_data

    Dosage Guidelines

    Dosage Used in Studies

    260-800 mg

    Best Time to Take

    Before bed for sleep; 30-90 minutes before a stressor for anxiety

    Best Form

    Standardised extract at 300-800 mg, or 2 g dried herb as tea for sleep

    Bioavailability

    Flavonoid glycosides such as vitexin are hydrolysed and absorbed in the small intestine with onset of effect within 30-60 minutes and a relatively short duration of action.

    Forms Compared

    Standardised extract

    Dried herb tea

    Tincture

    Combination with valerian and lemon balm

    Capsules

    Food & Timing

    One hour before bed for sleep, or 30-90 minutes before an anticipated stressor

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.