Dong Quai Interactions with Medicines: What to Know

Dong quai (Angelica sinensis) can interact with medicines, and the most consistent interaction in the literature is with anticoagulants and antiplatelet medicines, because of the risk of bleeding. The available evidence comes mainly from reviews and case reports, not from controlled clinical trials, so the honest answer is: the risk exists, but it is not quantified. If you take any medicine, speak to your doctor or pharmacist before you start taking dong quai.

This page explains why a plant can interfere with medicines, what is known about each group of medicines, what the label of a dong quai product says and what to do in practice — including before surgery. For the general context of the ingredient, see dong quai and benefits, what it is used for and what the science says.

Why can dong quai interact with medicines?

Dong quai is a root used for centuries in traditional Chinese medicine, mainly in formulas for menstrual discomfort and menopausal symptoms ¹. Being "natural" does not mean being inert: the root contains bioactive compounds — organic acids, phthalides, polysaccharides and coumarins — that can act on mechanisms that are also targets of medicines ².

Two pathways explain most of the concerns. The first is coagulation: coumarins and other constituents may have antiplatelet activity, that is, reduce the ability of platelets to aggregate ³. The second is liver metabolism: some laboratory studies suggest that Angelica sinensis extracts can alter cytochrome P450 enzymes, which break down many medicines — but these data come mainly from in vitro and animal experiments, and cannot predict what happens in people at usual doses ².

A review of interactions between supplements and medicines estimated that a relevant proportion of adults take prescription medicines at the same time as herbal or vitamin products, which creates the opportunity for interactions — although documented interactions are few ⁴.

Dong quai with anticoagulants: the most cited interaction

If you take warfarin, acenocoumarol or another anticoagulant, this is the combination that requires most care. A review published in the Lancet lists dong quai among the plants associated with bleeding when combined with warfarin, alongside ginkgo, garlic and danshen ⁵. Another review describes case reports suggestive of an interaction between warfarin and dong quai, with the need for closer monitoring ⁴.

What this means in practice: these are not clinical trials proving an average effect on coagulation, they are warning signs (case reports and reviews). Even so, the possible outcome — bleeding, including internal bleeding — is serious enough that caution is the right response. If you take an anticoagulant, do not start dong quai without your doctor's express instruction; if you already take it, do not change anything without telling them.

Dong quai with antiplatelets and anti-inflammatories

With aspirin, clopidogrel or other antiplatelets, the reasoning is similar. A review of interactions between plants and painkillers includes dong quai in the list of plants with known antiplatelet activity that may increase the risk of bleeding when used with non-steroidal anti-inflammatories, especially aspirin ⁶. The same paper notes that paracetamol may, in theory, interact with some of these plants, but with much weaker data ⁶.

In plain terms: occasional use of a common painkiller is not a reason for panic, but regular use of anti-inflammatories together with dong quai deserves a conversation with your pharmacist. Signs such as easy bruising, nosebleeds or bleeding gums should be taken seriously.

If you notice signs such as bruising without an apparent cause, frequent nosebleeds or bleeding gums while taking dong quai, seek medical advice — especially if you are also taking medicines that affect coagulation.

What about the pill, hormone therapy or antidepressants?

Here the evidence is even thinner and it is important not to turn hypotheses into facts. Dong quai has been studied in the context of traditional formulas with oestrogenic activity, but that does not mean it interacts with oral contraception or hormone replacement therapy in women taking those medicines ⁷. A review of interactions with phytoestrogens describes this type of interaction as "purely speculative", based on theoretical mechanisms of binding to the oestrogen receptor, and not on clinical data ⁴.

As for antidepressants and other medicines metabolised in the liver, the plausible mechanism exists (via cytochrome P450 enzymes), but there are no human data confirming relevant changes at usual doses of dong quai ². This is not a green light: it is an invitation to ask your doctor or pharmacist before combining, especially if you take psychiatric medicines, or medicines for cholesterol, blood pressure or diabetes.

What studies say about effectiveness (and why that matters for the decision)

The decision to take dong quai or not depends not only on the risk of interaction: it also depends on the expected benefit. And here the data are modest. A systematic review of randomised clinical trials on herbal products for menopausal symptoms identified only one trial with dong quai, among 18 studies analysed ⁸. A more recent systematic review, which included 30 randomised trials of oral herbal supplements not based on soy, concluded that the two trials that used black cohosh and dong quai showed no measurable effects ⁹.

In other words: when the benefit is uncertain and the potential risk is bleeding, the bar for taking that risk goes up. This is especially relevant for people taking anticoagulants, where the change is not "one more supplement", it is a new variable in a treatment with a narrow margin.

What the label of a dong quai product says

Hormonal Balance Gummies include, per 2-gummy serving, 100 mg of dong quai extract, plus maca (400 mg), shatavari extract (150 mg), saffron extract (30 mg), zinc citrate (5 mg; 50% of the reference intake), vitamin B6 (1.5 mg; 107%) and vitamin D3 (10 µg; 200%). The directions for use state to chew 2 gummies per day, preferably after a meal, without exceeding the recommended daily dose.

The label warnings themselves are clear and align with what this page explains: not recommended for pregnant or breastfeeding women; in case of illness or when taking medicines, consult a health professional before consuming; contains polyols, whose excessive consumption may have a laxative effect. Note that studies with dong quai often use doses and preparations different from those of a supplement, and study doses are not instructions for use.

How to talk to your doctor or pharmacist

Do not assume the professional knows dong quai — it is not a common product in Europe and you may need to give them the scientific name. A simple preparation helps:

• Complete list of medicines, including over-the-counter ones, contraceptives and other supplements.
• Scientific name: Angelica sinensis (also called danggui).
• Dose and form of the product you are thinking of taking (for example, extract in gummies).
• The reason you want to take it and what you hope to improve.
• Relevant history: bleeding, recent or planned surgery, clotting problems, liver disease.

If the professional does not have the information, you can suggest they consult specialised sources, such as herbal medicine monographs or interaction databases. To understand the ingredient better before the conversation, you can read how dong quai works according to science and what daily dose is usually mentioned.

Surgery, pregnancy and other risk contexts

If you have planned surgery, tell the surgeon and the anaesthetist that you take dong quai. As the plant is associated with antiplatelet activity ³ and with reports of bleeding with anticoagulants ⁵, stopping before the operation is a usual precaution — confirm with the medical team how long before you should stop.

Some professionals recommend stopping dong quai at least two weeks before planned surgery, as a precaution; always confirm the timing with the medical team, who know your case.

In pregnancy and breastfeeding, the label of the TuttiBear product does not recommend consumption and there are no safety data that allow us to state otherwise. There are also no data that allow us to recommend dong quai to children. In any of these cases, the decision should go through a health professional.

If you are breastfeeding or thinking of giving dong quai to a child, do not do so without the advice of a health professional: there are no safety data that allow us to recommend these situations.

Practical questions before deciding

Situation	What the evidence suggests	What to do
You take warfarin or acenocoumarol	Case reports and reviews associate dong quai with bleeding with warfarin 5 4	Do not start without medical instruction; close monitoring if your doctor authorises it
You take aspirin or another antiplatelet	Plant with antiplatelet activity; increased bleeding risk with NSAIDs 6	Speak to your pharmacist before regular use
You take a contraceptive or hormone therapy	Interaction with phytoestrogens described as speculative 4	Ask your doctor; assume neither safety nor danger
You take antidepressants or statins	Theoretical mechanism via liver enzymes, without robust human data 2	Inform your doctor before starting
Planned surgery	Antiplatelet activity described 3	Tell the team and follow their advice on when to stop

If you are looking for options with more evidence for specific symptoms, speak to your doctor about alternatives. And if you decide to go ahead, choose a quality product and keep your health professional informed — supervision is what turns an uncertain decision into a managed one. For context on the form of the product, see dong quai gummies or tablets and when to take it.

Frequently asked questions

Does dong quai interact with anticoagulants?

Yes, it is the most cited interaction. Reviews and case reports associate dong quai with bleeding when combined with warfarin, probably because of the plant's antiplatelet activity. If you take an anticoagulant, do not start dong quai without your doctor's instruction.

Can I take dong quai with ibuprofen or aspirin?

Aspirin and other anti-inflammatories have an antiplatelet effect, and dong quai is also associated with antiplatelet activity, so the combination may increase the risk of bleeding. Occasional use is not a cause for alarm, but regular use should be discussed with your pharmacist.

Does dong quai interfere with the contraceptive pill?

There are no studies confirming this interaction. The hypothesis is based on the plant's potential oestrogenic effect, but reviews describe this type of interaction as speculative. If the pill is your only method of contraception, speak to your doctor before combining.

How long before surgery should I stop dong quai?

There is no timeframe established by studies. As the plant is associated with antiplatelet activity, the usual precaution is to stop before planned surgery, but the timing should be set by the surgeon or anaesthetist, whom you should tell that you take the supplement.

Is dong quai safe if I take medicines for blood pressure or cholesterol?

There are no robust human data confirming relevant interactions with these medicines, but a theoretical mechanism exists through liver enzymes. In the absence of data, the prudent approach is to inform your doctor or pharmacist before starting.

Is dong quai effective for menopausal symptoms?

The evidence is weak. A recent systematic review of randomised trials concluded that the studies with dong quai showed no measurable effects on menopausal symptoms. If the benefit is uncertain, the risk of interaction weighs more in the decision.