CNS Drugs

, Volume 24, Issue 3, pp 207–225 | Cite as

The Efficacy of Hypericum perforatum (St John’s Wort) for the Treatment of Premenstrual Syndrome

A Randomized, Double-Blind, Placebo-Controlled Trial
  • Sarah CanningEmail author
  • Mitch Waterman
  • Nic Orsi
  • Julie Ayres
  • Nigel Simpson
  • Louise Dye
Original Research Article


Background: Premenstrual syndrome (PMS) is a common condition. Some of the most widely prescribed medications are selective serotonin reuptake inhibitors (SSRIs), based on the hypothesized role of serotonin in the production of PMS symptoms. PMS sufferers, especially those experiencing mild to moderate symptoms, are often reluctant to take this form of medication and instead buy over-the-counter preparations to treat their symptoms, for which the evidence base with regard to efficacy is limited. Hypericum perforatum (St John’s wort) influences the serotonergic system. As such, this widely available herbal remedy deserves attention as a PMS treatment.

Objective: To investigate the effectiveness of Hypericum perforatum on symptoms of PMS.

Study design: This randomized, double-blind, placebo-controlled, crossover study was conducted between November 2005 and June 2007.

Setting: Institute of Psychological Sciences, University of Leeds, Leeds, UK.

Participants: 36 women aged 18–45 years with regular menstrual cycles (25–35 days), who were prospectively diagnosed with mild PMS.

Intervention: Women who remained eligible after three screening cycles (n = 36) underwent a two-cycle placebo run-in phase. They were then randomly assigned to receive Hypericum perforatum tablets 900 mg/day (standardized to 0.18% hypericin; 3.38% hyperforin) or identical placebo tablets for two menstrual cycles. After a placebo-treated washout cycle, the women crossed over to receive placebo or Hypericum perforatum for two additional cycles.

Main outcome measures: Symptoms were rated daily throughout the trial using the Daily Symptom Report. Secondary outcome measures were the State Anxiety Inventory, Beck Depression Inventory, Aggression Questionnaire and Barratt Impulsiveness Scale. Plasma hormone (follicle-stimulating hormone [FSH], luteinizing hormone [LH], estradiol, progesterone, prolactin and testosterone) and cytokine (interleukin [IL]-1β, IL-6, IL-8, interferon [IFN]-γ and tumour necrosis factor [TNF]-α) levels were measured in the follicular and luteal phases during Hypericum perforatum and placebo treatment.

Results: Hypericum perforatum was statistically superior to placebo in improving physical and behavioural symptoms of PMS (p < 0.05). There were no significant effects of Hypericum perforatum compared with placebo treatment for mood- and pain-related PMS symptoms (p > 0.05). Plasma hormone (FSH, LH, estradiol, progesterone, prolactin and testosterone) and cytokine (IL-1β, IL-6, IL-8, IFNγ and TNFα) levels, and weekly reports of anxiety, depression, aggression and impulsivity, also did not differ significantly during the Hypericum perforatum and placebo cycles (p > 0.05).

Conclusion: Daily treatment with Hypericum perforatum was more effective than placebo treatment for the most common physical and behavioural symptoms associated with PMS. As proinflammatory cytokine levels did not differ significantly between Hypericum perforatum and placebo treatment, these beneficial effects are unlikely to be produced through this mechanism of action alone. Further work is needed to determine whether pain- and mood-related PMS symptoms benefit from longer treatment duration.

Trial registration number (International Standard Randomised Controlled Trial Number Register) ISRCTN31487459


Beck Depression Inventory Luteal Phase Placebo Treatment Hypericin Hypericum Perforatum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Thanks are due to Lichtwer Pharma AG (Berlin, Germany) for the donation of the supplements and the Rosalind Bolton Bequest for funding the PhD studentship of the corresponding author. The Rosalind Bolton Bequest played no role in the production or submission of this manuscript. Thanks are also due to Biss Hartley for assisting Dr Julie Ayres with clinical interviews and to Uma Ekbote and Sarah Field for technical assistance.

No other sources of funding were used to assist in the preparation of this study. The authors have no conflicts of interest that are directly relevant to the content of this study.

Authors’ contributions: SC, LD, MW and NS designed the study and interpreted the data. SC collected the data. SC and LD analysed the data. SC wrote the paper. LD, MW, NS and NO made suggestions for revisions. NO supervised the hormone and cytokine assays. JA undertook clinical interviews with each participant. JA and NS were the physicians responsible for the study.


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Copyright information

© Adis Data Information BV 2010

Authors and Affiliations

  • Sarah Canning
    • 1
    Email author
  • Mitch Waterman
    • 1
  • Nic Orsi
    • 2
  • Julie Ayres
    • 3
  • Nigel Simpson
    • 2
  • Louise Dye
    • 1
  1. 1.Institute of Psychological Sciences, University of LeedsLeedsUK
  2. 2.Perinatal Research Group, The YCR and Liz Dawn Pathology and Translational Sciences Centre, Leeds Institute of Molecular MedicineSt James’s University HospitalLeedsUK
  3. 3.Rosalind Bolton PMS Clinic, St James’s University HospitalLeedsUK

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