Passionflower for sleep: evidence and precautions

What is known about passionflower for sleep, its forms, limits and safety precautions.

By Anja Vogel · Pharmacognosist7 min readPublished 09/11/2026

Sources: 3
Validated claims: 5
Dominant evidence: Limited
Freshness: 09/11/2026

Passionflower (Passiflora incarnata) is often described as a calming herb. European authorities mainly recognise traditional use for mild symptoms of mental stress and to aid sleep. That is not the same as strong evidence for insomnia, and the plant requires a few precautions.

1. Which passionflower? This article concerns Passiflora incarnata, whose dried aerial parts or extracts are used in some preparations. It should not be confused with Passiflora edulis, the fruit-bearing passionflower.

The EMA distinguishes cut or powdered plant material, teas, and dry or liquid extracts. A tea and an extract are therefore not interchangeable: their composition and the amount absorbed may differ.

2. What do the sleep data show? The EMA recognises traditional use to aid sleep and relieve mild mental stress. This conclusion rests on longstanding plausible use, not on clinical trials strong enough to establish certain efficacy.

The NCCIH reports a small amount of research suggesting a possible improvement in total sleep time in adults with insomnia. Findings are mixed for falling asleep and staying asleep. A systematic review of Passiflora incarnata also points to few studies and varied preparations.

3. Tea, powder or extract A tea uses dried plant material steeped in water. Powder and extracts are different forms, and composition depends on processing and product. Results from an extract study should not automatically be applied to tea.

Follow the product leaflet and seek advice if symptoms last more than two weeks or worsen. Do not transfer a dose from one product to another.

4. Drowsiness and interactions Passionflower can cause drowsiness, dizziness or confusion. Do not drive or operate machinery if your alertness is reduced.

The NCCIH advises professional advice before surgery because passionflower may interact with anaesthetic medicines. Advice is also appropriate with regular treatment, especially medicines that already cause drowsiness. Alcohol can add to reduced alertness.

5. A cautious decision Define the problem first: difficulty falling asleep, awakenings, evening stress or persistent symptoms. If sleep is disturbed for more than two weeks, worsens or comes with other symptoms, look for the cause rather than adding more herbs.

Check the botanical name, form and leaflet. Ask for advice if you take a sedative, regular medicines or have surgery planned. Compare the precautions in our article on valerian and its extracts. Lavender in its different forms raises a different safety question: an essential oil is not a tea.

06FAQ

01Does passionflower make you sleep? The evidence cannot establish that for everyone. Small studies suggest a possible effect on some sleep measures, while other findings are mixed.

02Can it be taken every night? Duration and form depend on the product. Follow its leaflet and seek advice if symptoms last more than two weeks, worsen or medicines are involved.

03What about pregnancy? The NCCIH advises against it during pregnancy. Safety data in breastfeeding are insufficient; consult a health professional.

04Can it be combined with a sleeping pill? Do not combine them without medical advice: drowsiness and nervous-system slowing may add up.

Sources Sources are listed in the editorial record for this article.

Sources

Peer-reviewed studies and institutional references used for this article.

1NCCIH (NIH)· 2025
Official guidelineLimited
adultes et sécurité générale
View source
2Nutrients / PubMed PMID 33352740· 2020
Systematic reviewLimited
adultes, études cliniques hétérogènes
View source
3EMA/HMPC· 2016
Official guidelineLimited
adultes et adolescents de plus de 12 ans
View source

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Anja Vogel

Studies plant compounds and their documented clinical effects.

Passionflower for sleep: evidence and precautions

1. Which passionflower? This article concerns Passiflora incarnata, whose dried aerial parts or extracts are used in some preparations. It should not be confused with Passiflora edulis, the fruit-bearing passionflower.

2. What do the sleep data show? The EMA recognises traditional use to aid sleep and relieve mild mental stress. This conclusion rests on longstanding plausible use, not on clinical trials strong enough to establish certain efficacy.

3. Tea, powder or extract A tea uses dried plant material steeped in water. Powder and extracts are different forms, and composition depends on processing and product. Results from an extract study should not automatically be applied to tea.

4. Drowsiness and interactions Passionflower can cause drowsiness, dizziness or confusion. Do not drive or operate machinery if your alertness is reduced.

5. A cautious decision Define the problem first: difficulty falling asleep, awakenings, evening stress or persistent symptoms. If sleep is disturbed for more than two weeks, worsens or comes with other symptoms, look for the cause rather than adding more herbs.

06FAQ

Sources Sources are listed in the editorial record for this article.

Sources

Discussion

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1. Which passionflower? This article concerns *Passiflora incarnata*, whose dried aerial parts or extracts are used in some preparations. It should not be confused with *Passiflora edulis*, the fruit-bearing passionflower.

2. What do the sleep data show? The EMA recognises traditional use to aid sleep and relieve mild mental stress. This conclusion rests on longstanding plausible use, not on clinical trials strong enough to establish certain efficacy.

3. Tea, powder or extract A tea uses dried plant material steeped in water. Powder and extracts are different forms, and composition depends on processing and product. Results from an extract study should not automatically be applied to tea.

4. Drowsiness and interactions Passionflower can cause drowsiness, dizziness or confusion. Do not drive or operate machinery if your alertness is reduced.

5. A cautious decision Define the problem first: difficulty falling asleep, awakenings, evening stress or persistent symptoms. If sleep is disturbed for more than two weeks, worsens or comes with other symptoms, look for the cause rather than adding more herbs.

06FAQ

Sources Sources are listed in the editorial record for this article.

Sources

Discussion

Related reading

Peppermint: digestion, evidence and safety precautions

Aloe vera: gel, latex and supplements — safety and effectiveness compared

Licorice: blood pressure, digestion and interactions — what precautions matter?

1. Which passionflower? This article concerns Passiflora incarnata, whose dried aerial parts or extracts are used in some preparations. It should not be confused with Passiflora edulis, the fruit-bearing passionflower.