Passionflower
Useful mainly for people with mild situational anxiety.
Quick decision guide
May help most
people with mild situational anxiety
Common dosing range
500-700 mg/day standardized extract
When to expect effects
Hours for acute anxiety; weeks for ongoing use
Watch out for
additive sedation with CNS depressants and alcohol
What is it
Passionflower (Passiflora incarnata) is a climbing vine native to the southeastern United States, with striking purple flowers and edible fruit. Its aerial parts (leaves, stems, flowers) have been used in traditional medicine for over 200 years for anxiety, insomnia, and nervous restlessness.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
generalized anxiety Limited Evidence | Moderate in small trials | Adults with mild generalized anxiety | Weeks (ongoing) or hours (acute) |
pre-operative anxiety Limited Evidence | Modest reduction | Adults facing an acute stressor such as surgery or a procedure | Hours |
sleep quality Limited Evidence | Small | People with mild sleep difficulty, often in combination formulas | Days to weeks |
generalized anxiety
- Effect
- Moderate in small trials
- Best fit
- Adults with mild generalized anxiety
- Time
- Weeks (ongoing) or hours (acute)
pre-operative anxiety
- Effect
- Modest reduction
- Best fit
- Adults facing an acute stressor such as surgery or a procedure
- Time
- Hours
sleep quality
- Effect
- Small
- Best fit
- People with mild sleep difficulty, often in combination formulas
- Time
- Days to weeks
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
generalized anxiety
Supplement benefitPassionflower's flavonoids are thought to modulate GABA neurotransmission. A small randomized trial in generalized anxiety disorder found an extract comparable to oxazepam over 4 weeks with less performance impairment, but the overall evidence base is small and of limited quality.
Bottom line: Promising for mild anxiety in small trials, but evidence is limited.
pre-operative anxiety
Supplement benefitSeveral small trials report reduced pre-operative anxiety with single doses of passionflower taken 30-90 minutes beforehand, without major sedation at standard doses. Studies are small and short.
Bottom line: A single pre-procedure dose may modestly reduce acute anxiety.
sleep quality
Supplement benefitSome trials, often using multi-herb sleep formulas, report small improvements in sleep quality with passionflower. Effects are smaller and less consistent than for valerian, and single-herb evidence is thin.
Bottom line: May slightly aid sleep, but evidence is weaker than for its anxiety use.
Evidence is mixed
Single-herb sleep trials are sparse and many positive results come from combination products.
How it works
How to take it
What to track
4 commercial forms
Compare the main delivery options and what they’re best suited for.
Passionflower extract (standardized)
Standard supplemental form. 500 to 700 mg/day in divided doses for anxiety. Quality varies between brands.
Standardized to vitexin and other flavonoid content.
Passionflower tincture (liquid extract)
Traditional format. 30 to 60 drops in water 2 to 3 times daily.
Liquid form; faster onset for acute anxiety use.
Passionflower tea
Pleasant traditional use. 1 cup 1 to 3 times daily for mild anxiety or sleep support.
Lower concentrated dose per cup.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
Confusion at high doses
Rare allergic reactions
Who should avoid it
- Pregnant people (possible uterine stimulant)
- People before surgery
- People on sedatives or MAOIs
Pregnancy & breastfeeding
Avoid during pregnancy due to potential uterine-stimulating effects; use caution while breastfeeding.
Interactions
Additive CNS depression
Small amounts of harmala alkaloids may potentiate effects
Mild antiplatelet activity reported in some studies
Documented interactions
Evidence-graded pair pages with sources, dosing notes, and timing guidance — a complement to the narrative section above.
See all 2 Passionflower interactions →Protocols featuring Passionflower
Evidence-backed routines where Passionflower plays a role.
Food sources
| Food | Amount | %DV |
|---|---|---|
| Passion fruit | edible fruit of related species; minimal medicinal compounds | — |
| Passionflower tea (1 cup) | ~1 to 2 g dried herb | — |
Passion fruit
- Amount
- edible fruit of related species; minimal medicinal compounds
- %DV
- —
Passionflower tea (1 cup)
- Amount
- ~1 to 2 g dried herb
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Is passionflower as effective as Xanax?⌄
A small 2001 trial found passionflower extract was comparable to oxazepam (a similar benzodiazepine) for generalized anxiety over 4 weeks, with less impairment of work performance. This is preliminary evidence; passionflower is not a replacement for prescription anxiolytics in moderate to severe anxiety disorders.
Will passionflower make me drowsy during the day?⌄
At standard doses (300 to 500 mg), most users don't experience significant daytime drowsiness. Some users do feel mildly sedated; start with lower doses if you have demanding daytime obligations.
Can I take passionflower with melatonin?⌄
Yes, no major interaction is documented. Many sleep formulations combine them. Start with lower doses of each to assess tolerance.
Is passionflower the same as the fruit passion fruit?⌄
Related but different. Passion fruit comes from Passiflora edulis, a different species. Medicinal passionflower (Passiflora incarnata) is used for the aerial parts of the plant, not the fruit, and is not typically eaten as a food.
How long does passionflower take to work?⌄
For acute anxiety, effects can appear within 30 to 90 minutes of a dose. For chronic anxiety, effects may build over 2 to 4 weeks of consistent use.
References by claim
generalized anxiety
pre-operative anxiety
Safety
Memorial Sloan Kettering — Passionflower — MSKCC About Herbs link
Track Passionflower with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.