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
Is it as strong as a benzodiazepine?
Can I take it every night?
Passionflower or valerian?
Will it make me drowsy the next day?
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
Passionflower shows modest acute anxiolytic effects in small clinical settings.
Improved Sleep Quality
Small trials suggest passionflower mildly improves sleep quality, with effects short of pharmaceutical hypnotics.
Mood Stabilization
Anxiolytic signal exists but mood-specific evidence is thin.
Health Concerns Addressed
No linked health concerns yet.
Supporting Research6 studies
Passiflora for anxiety disorder
Miyasaka LS, Atallah AN, Soares BG
Evidence from the few eligible trials was insufficient to judge whether passionflower helps anxiety disorders.
Passiflora incarnata in Neuropsychiatric Disorders-A Systematic Review
Janda K, Wojtkowska K, Jakubczyk K
Passionflower showed modest anxiolytic and sleep-promoting effects across heterogeneous trials.
Preoperative oral Passiflora incarnata reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study
Movafegh A, Alizadeh R, Hajimohamadi F
Preoperative Passiflora reduced anxiety without prolonging recovery or causing sedation.
Effects of Passiflora incarnata Linnaeus on polysomnographic sleep parameters in subjects with insomnia disorder: a double-blind randomized placebo-controlled study
Lee J, Jung HY, Lee SI +2 more
A valerian and passionflower combination improved insomnia severity and sleep efficiency versus placebo.
Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam
Akhondzadeh S, Naghavi HR, Vazirian M
Passionflower was as effective as oxazepam for generalized anxiety with less job-performance impairment.
A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality
Ngan A, Conduit R
Passionflower tea improved subjective sleep quality with no change in objective sleep measures.
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: Not enough evidence to judge
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.
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| Sleep | 2 g dried herb as tea, or 300-450 mg extract, one hour before bed | |
| Generalised anxiety | 45 drops of tincture, or 400-800 mg extract daily, divided | |
| Situational anxiety | 260-500 mg extract, 30-90 minutes before the stressor | |
| Duration | Safe for short-term use; most trials ran 2-4 weeks | |
| Notes | Do not combine with alcohol or sedatives; discontinue before surgery |
Forms Compared
Standardised extract
Usually 3.5-4% vitexin at 300-800 mg; the form used in anxiety trials
Dried herb tea
2 g steeped 10 minutes before bed; the form used in the sleep quality trial
Tincture
Fast onset, typically 1-4 mL up to three times daily
Combination with valerian and lemon balm
Common sleep formulas; often better evidenced than passionflower alone
Capsules
Convenient standardised dosing for regular use
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.