Passionflower
- What Is Passionflower Used for Today?
- What Is the Scientific Evidence for Passionflower?
- Dosage
- Safety Issues
- Interactions You Should Know About
- References
En Español (Spanish Version)The passionflower vine is a native of the Western hemisphere, named for symbolic connections drawn between its appearance and the crucifixion of Jesus. Native North Americans used passionflower primarily as a mild sedative. It quickly caught on as a folk remedy in Europe and was thereafter adopted by professional herbalists as a sedative and digestive aid.
In 1985, Germany's Commission E officially approved passionflower as a treatment for "nervous unrest." The herb is considered to be a mildly effective treatment for
anxiety
and
insomnia
, less potent than
kava
and
valerian
, but nonetheless useful. Like
melissa
(lemon balm),
chamomile
, and valerian, passionflower is also used for
nervous stomach
.
However, there is only weak supporting scientific evidence that passionflower works for these purposes. Preliminary
trials
suggest that passionflower might be helpful for
anxiety9,14
and
chemical dependency
.
10
Animal studies
suggest that passionflower extracts can reduce agitation and prolong sleep.
1,11-13
The active ingredients in passionflower are not known.
A 4-week double-blind study of 36 individuals with
anxiety
(specifically, generalized anxiety disorder) compared passionflower to the standard drug oxazepam.
9
Oxazepam worked more quickly, but by the end of the 4-week trial, both treatments proved equally effective. Furthermore, passionflower showed a comparative advantage in terms of side-effects: use of oxazepam was associated with more job-related problems (such as, daytime drowsiness). And, in a placebo-controlled trial involving 60 surgical patients, passionflower significantly reduced anxiety up to 90 minutes prior to surgery.
14
A 14-day, double-blind trial enrolled 65 men addicted to opiate drugs and compared the effectiveness of passionflower and the drug clonidine together against clonidine alone.
10
Clonidine is a drug widely used to assist narcotic withdrawal. It effectively reduces physical symptoms such as increased blood pressure. However, clonidine does not help emotional symptoms, such as drug craving, anxiety, irritability, agitation, and depression. These symptoms can be quite severe and often cause enrollees in drug treatment programs to end participation. In this 14 day study, the use of passionflower along with clonidine significantly eased the emotional aspects of withdrawal as compared to clonidine alone.
The proper dosage of passionflower is 1 cup 3 times daily of a tea made by steeping 1 teaspoon of dried leaves for 10 to 15 minutes. Passionflower tinctures and powdered extracts should be taken according to the label instructions.
Passionflower is on the FDA's GRAS (Generally Recognized as Safe) list.
The alkaloids harman and harmaline found in passionflower have been found to act somewhat like the drugs known as MAO inhibitors and also to stimulate the uterus,
3,4
but whether whole passionflower has these effects remains unknown. Passionflower might increase the action of sedative medications.
5,6,7
Finally, there are five case reports from Norway of individuals becoming temporarily mentally impaired from a combination herbal product containing passionflower.
8
It is not clear whether the other ingredients may have played a role.
Safety has not been established for pregnant or nursing mothers, very young children, or those with severe liver or kidney disease.
References
Speroni E, Minghetti A. Neuropharmacological activity of extracts from
Passiflora incarnata.Planta Med.
1988;54:488-491.
Schulz V, Hansel R, Tyler VE.
Rational Phytotherapy: A Physician’s Guide to Herbal Medicine
. 3rd ed. Berlin, Germany: Springer-Verlag; 1998:84.
Newall CA, Anderson LA, Phillipson JD.
Herbal Medicines: A Guide for Health-Care Professionals
. London, England: Pharmaceutical Press; 1996:206.
Farnsworth NR, Bingel AS, Cordell GA, et al. Potential value of plants as sources of new antifertility agents I.
J Pharm Sci.
1975;64:535-598.
Speroni E, Billi R, Mercati V, et al. Sedative effects of crude extract of
Passiflora incarnata
after oral administration.
Phytother Res.
1996;10:S92-S94.
Speroni E, Minghetti A. Neuropharmacological activity of extracts from
Passiflora incarnata.Planta Med.
1988;54:488-491.
Aoyagi N, Kimura R, Murata T. Studies on
Passiflora incarnata
dry extract. I. Isolation of maltol and pharmacological action of maltol and ethyl maltol.
Chem Pharm Bull.
1974;22:1008-1013.
Solbakken AM, Rorbakken G, Gundersen T. Nature medicine as intoxicant [in Norwegian; English abstract].
Tidsskr Nor Laegeforen.
1997;117:1140-1141.
Akhondzadeh S, Naghavi HR, Vazirian M, et al. Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam.
J Clin Pharm Ther
. 2001;26:363-367.
Akhondzadeh S, Kashani L, Mobaseri M, et al. Passionflower in the treatment of opiates withdrawal: a double-blind randomized controlled trial.
J Clin Pharm Ther
. 2001;26:369-373.
Dhawan K, et al. Anxiolytic activity of aerial and underground parts of
Passiflora incarnata. Fitoterapia
2001;72:922-926
Speroni E, and Minghetti A. Neuropharmacological activity of extracts from
Passiflora incarnata.Planta Med.
1988;54:488-491.
Aoyagi N, et al. Studies on
Passiflora incarnata
dry extract. I. Isolation of maltol and pharmacological action of maltol and ethyl maltol.
Chem Pharm Bull (Tokyo).
1974;22:1008-1013.
Movafegh A, Alizadeh R, Hajimohamadi F, et al. Preoperative oral
Passiflora incarnata
reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study.
Anesth Analg.
2008;106:1728-1732
Last Reviewed July 2012