Rude DrugsRUDE DRUGS

Ashwagandha

GRAS

Withania somnifera

Ashwagandha

Botanical illustration — Withania somnifera

Molecular diagram

Molecular structures — key phytochemicals

Botanical Profile

FamilySolanaceae
GenusWithania
Speciessomnifera
Parts Usedroot, leaf
DistributionNative to the Indian subcontinent, particularly the drier regions. Also found in the Mediterranean, the Middle East, and parts of Africa. Cultivated extensively in India (Madhya Pradesh, Rajasthan), and adapts well to arid and semi-arid climates with well-drained soils.

One of the most important herbs in Ayurvedic medicine, ashwagandha has been used for over 3,000 years as a rasayana (rejuvenating tonic). Classified as an adaptogen, it modulates the stress response system and has demonstrated significant anxiolytic, neuroprotective, and immunomodulatory activity in clinical trials.

Morphology

Drought-tolerant evergreen shrub growing 35–75 cm tall. Branches extend radially from a central stem. Leaves are dull green, ovate, and elliptic. Small greenish flowers give way to orange-red berries enclosed in papery calyxes. Roots are light brown, tuberous, and have a distinct earthy odour.

Traditional & Ethnobotanical Uses

In Ayurveda, classified as a rasayana herb used for longevity, stress reduction, and cognitive enhancement. Traditional indications include anxiety, insomnia, fatigue, weakness, and as an immunomodulator. Used to enhance strength and vitality. In Unani medicine, used as a tonic and aphrodisiac. Leaves traditionally applied topically for skin conditions and as a poultice for inflammation.

Phytochemical Profile

Primary bioactive constituents are steroidal lactones called withanolides (0.1–0.5% of root by weight), including withaferin A, withanolide A, withanolide D, and withanoside IV–VI. Also present are withanosides (saponins), alkaloids including withanine, somniferine, and tropine. The plant contains sitoindosides VII–X which show significant antistress activity. Iron content in root preparations contributes to haematopoietic effects. Standardised extracts typically provide 2.5–5% withanolides.

Withaferin AWithanolide AWithanoside IVWithanineSomniferine

Mechanisms of Action

Ashwagandha modulates the hypothalamic-pituitary-adrenal (HPA) axis, reducing elevated cortisol levels and normalising the stress response. Withanolides demonstrate GABAergic activity, binding to GABA-A receptors producing anxiolytic effects without sedation. Withaferin A exhibits anti-inflammatory activity via NF-κB pathway inhibition and COX-2 suppression. Immunomodulatory effects include enhancement of natural killer cell activity and modulation of Th1/Th2 cytokine balance. Neuroprotective effects mediated through antioxidant activity, BDNF upregulation, and amyloid-beta clearance.

Clinical Indications

Conditions

AnxietyInsomniaChronic stressCognitive declineAdrenal fatigue

Symptoms

StressFatigueSleep difficultiesRestlessnessPoor concentration

Dosage & Preparation

Root extract standardised to 2.5–5% withanolides: 250–600 mg daily, typically in divided doses. KSM-66 extract: 300 mg twice daily. Sensoril extract: 125–250 mg twice daily. For anxiety and stress: 250–600 mg daily for 6–8 weeks. For insomnia: 300 mg of root extract twice daily, with one dose before bedtime. Whole root powder: 1–6 g daily.

Safety & Interactions

Contraindications

Contraindicated in hyperthyroidism (may stimulate thyroid hormone production). Avoid in autoimmune conditions such as multiple sclerosis and rheumatoid arthritis due to immunostimulatory effects. Caution in pregnancy (abortifacient activity reported in animal studies). Discontinue prior to surgery (potential sedative effects).

Drug Interactions

Thyroid medications — may increase T3/T4 levels, necessitating dose monitoring. Sedatives and CNS depressants (benzodiazepines, barbiturates) — additive sedative effect. Immunosuppressants — may antagonise immunosuppressive therapy. Antidiabetic medications — potential additive hypoglycaemic effect. Antihypertensives — may potentiate blood pressure lowering.

My Research Notes

No notes yet.

References

  1. [1]Chandrasekhar K, et al.
  2. [2]A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety.
  3. [3]Indian J Psychol Med. 2012.
  4. [4]34(3):255-62.
  5. [5]Langade D, et al.
  6. [6]Efficacy and safety of ashwagandha root extract in insomnia.
  7. [7]Cureus. 2019.
  8. [8]11(10):e5986.
  9. [9]Mishra LC, et al.
  10. [10]Scientific basis for the therapeutic use of Withania somnifera (ashwagandha): a review.
  11. [11]Altern Med Rev. 2000.
  12. [12]5(4):334-46..

Latest Research

PubMed Live

No recent publications found.