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As women navigate the hormonal shifts of midlife and perimenopause, many explore botanical supplements like ashwagandha (Withania somnifera) to support well-being. Ashwagandha has been studied for its potential effects on stress, anxiety, and sleep, which can be relevant concerns during this life stage [1].
However, it’s crucial to understand that even natural supplements can interact with prescription medications. For women taking daily medications, being aware of potential ashwagandha drug interactions is an essential step towards safe and informed use. This article provides an evidence-based overview of these considerations.
Understanding Ashwagandha’s Potential Effects
Ashwagandha is an adaptogenic herb, meaning it is thought to help the body adapt to various stressors [1]. Research has explored its potential influence on stress perception, anxiety, and insomnia [1]. Some studies also suggest it may have a role in managing certain menopausal symptoms [2] and could support aspects like muscle strength and recovery in female athletes [3]. Its diverse potential effects stem from various compounds, including withanolides, which have been investigated for their biological activities [PMID 37111543, PMID 38446743].
While these potential benefits are being explored, it’s important to recognize that ashwagandha can exert physiological effects that may overlap with or alter the actions of prescription drugs. This is why a careful approach to combining ashwagandha with medications is necessary.
Potential Interactions with Central Nervous System (CNS) Depressants
Ashwagandha has been studied for its potential to support relaxation and improve sleep quality [1]. Because of these potential effects, there is a theoretical concern regarding its use alongside medications that also depress the central nervous system. These include sedatives, anxiolytics (anti-anxiety medications), and certain sleep aids.
Combining ashwagandha with such medications could potentially lead to increased drowsiness or sedation. While specific large-scale clinical trials directly on this interaction are limited, the overlapping mechanisms of action suggest caution is warranted. Women taking medications for anxiety or sleep should discuss ashwagandha use with their healthcare provider.
Interactions with Immunosuppressants
Some preclinical and in vitro research has suggested that ashwagandha may influence immune system activity [4]. If ashwagandha has immunomodulatory properties, there is a potential for it to interfere with immunosuppressant medications, which are prescribed to reduce the activity of the immune system. This could be particularly relevant for women with autoimmune conditions or those who have undergone organ transplantation.
While direct human studies specifically detailing this interaction are limited, the theoretical basis calls for careful consideration. Individuals taking immunosuppressants should avoid ashwagandha without explicit medical guidance.
Considerations for Thyroid Medications
Ashwagandha has been an area of interest in relation to thyroid function, with some studies exploring its potential influence on thyroid hormone levels [5]. For women taking thyroid hormone replacement medications, such as levothyroxine, this potential interaction is significant. Alterations in thyroid hormone levels, even subtle ones, could affect the efficacy of prescribed thyroid medication.
Therefore, individuals with thyroid conditions, particularly those on thyroid medication, should exercise caution. Regular monitoring of thyroid hormone levels would be important if ashwagandha is considered, and it should only be used under the supervision of a healthcare professional.
Impact on Cytochrome P450 Enzymes and Drug Metabolism
Many prescription drugs are metabolized by a group of enzymes in the liver known as the cytochrome P450 (CYP450) system. If a supplement influences these enzymes, it can change how quickly a drug is broken down and eliminated from the body, potentially altering its effectiveness or increasing the risk of side effects. Research has investigated ashwagandha’s in vitro effect on CYP450 enzymes.
One in vitro study suggested that Withania somnifera, the botanical name for ashwagandha, could potentially affect the activity of certain CYP450 enzymes, specifically CYP3A4 and CYP2D6 [6]. While in vitro findings do not always translate directly to human physiology, they highlight a potential mechanism for ashwagandha drug interactions. Women on medications metabolized by CYP3A4 or CYP2D6 should be particularly mindful and consult their doctor or pharmacist.
Antidepressant and Adaptogen Interactions
Perimenopause can be a time when women experience mood changes, and some may be prescribed antidepressant medications. A retrospective chart review explored adverse events related to interactions between adaptogens, including ashwagandha, and antidepressant drugs [7]. The study identified some reported adverse events, although the overall evidence strength for direct interactions specifically with ashwagandha and antidepressants was noted as moderate [7].
Given that both ashwagandha and antidepressants can influence mood and neurological pathways, there is a theoretical basis for potential interactions. It is crucial for women taking antidepressants to discuss ashwagandha use with their healthcare provider to avoid any unforeseen effects or diminished medication efficacy.
References
- Effects of Withania somnifera (Ashwagandha) on Stress and the Stress- Related Neuropsychiatric Disorders Anxiety, Depression, and Insomnia. Current neuropharmacology, 2021
- A prospective, randomized, double-blind, placebo-controlled study on efficacy and safety of Ashwagandha root extract (Withania somnifera) for managing menopausal symptoms in women. Frontiers in reproductive health, 2025
- Effects of Root Extract of Ashwagandha (Withania somnifera) on Perception of Recovery and Muscle Strength in Female Athletes. European journal of sport science, 2025
- Ashwagandha (Withania somnifera)-Current Research on the Health-Promoting Activities: A Narrative Review. Pharmaceutics, 2023
- Potential Adverse Effects of Ashwagandha: A Critical Review of Preclinical and Clinical Evidence. Phytotherapy research : PTR, 2026
- In vitro effect of Withania somnifera, AYUSH-64, and remdesivir on the activity of CYP-450 enzymes: Implications for possible herb-drug interactions in the management of COVID-19. Frontiers in pharmacology, 2022
- Harder, better, faster, stronger? Retrospective chart review of adverse events of interactions between adaptogens and antidepressant drugs. Frontiers in pharmacology, 2023
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
