Research summary
Ashwagandha, Medicines and Supplement Combinations
NIH guidance flags possible interactions with medicines for diabetes, blood pressure, immune suppression, seizures, sedation and thyroid hormones. A short tolerability study cannot establish the safety of a combination.[1]
Interaction guidance is not a personalized clearance
Discuss possible interactions with your prescriber or pharmacist before use; do not stop, replace, or adjust prescribed medicines based on supplement information.[1]
Short studies cannot establish safety for every person, preparation, or duration of use.[1]
Which medicines need a prescriber or pharmacist review?
Ashwagandha may interact with medicines for diabetes or high blood pressure, immunosuppressants, sedatives, anticonvulsants, and thyroid hormone medicines. Discuss possible interactions with your prescriber or pharmacist before use; do not stop, replace, or adjust prescribed medicines based on supplement information.[1]
Sleep supplements and drowsiness
Ashwagandha can cause drowsiness and gastrointestinal symptoms, including stomach upset, diarrhea, and vomiting. These reported effects do not describe every possible adverse reaction or predict an individual response.[1]
The NIH interaction warning includes sedatives. It does not establish a safe combined dose for ashwagandha and another sleep or calming product; review the full ingredient list and medicine list with a prescriber or pharmacist.[1]
What short-term studies leave unanswered
NIH guidance describes short-term tolerability observations for ashwagandha over about three months, while safety over longer periods remains unknown. Short studies cannot establish safety for every person, preparation, or duration of use.[1]
Who needs particular caution?
NCCIH advises avoiding ashwagandha during pregnancy and not using it while breastfeeding. Short-term studies in other adults do not establish safety during pregnancy or breastfeeding; discuss any exposure or supplement plans with a qualified healthcare professional.[1]
NCCIH does not recommend ashwagandha for people with thyroid or autoimmune disorders or those who are about to have surgery. Discuss these conditions and any planned surgery with your healthcare professional before considering ashwagandha; supplement research does not justify changing prescribed care.[1]
References
- Ashwagandha: Usefulness and Safety. NIH National Center for Complementary and Integrative Health. Retrieved 2026-09-30. Government health fact sheet View source →
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