American Dogwood Drug Interactions, Uses, Safety & More

American Dogwood (Cornus florida) is a small flowering tree native to the eastern United States. It is well known for its showy white or pink spring blooms, red berries in late summer, and bright red autumn leaves. Because it is so attractive, it is widely planted in gardens and landscapes.

The part most often used in folk medicine is the bark. In the past, especially in the 1800s, the bark was sometimes used as a substitute for quinine (cinchona bark) to treat fevers, including malaria. Today, American Dogwood is rarely used as a medicine or sold as a dietary supplement.

People have traditionally used American Dogwood bark for fevers, pain, digestive complaints, and as a general tonic. The bark was historically taken as a bitter "quinine substitute" when true quinine was hard to get.

The evidence for these uses is very weak. Most of what is known comes from historical folk use plus a small amount of laboratory and animal research. Some lab studies suggest the bark may have effects against certain parasites or microbes, but these findings have not been confirmed in well-designed human studies. At this time, there is not enough reliable evidence to say American Dogwood works for any health condition.

American Dogwood bark contains bitter plant compounds, including tannins and other substances sometimes grouped as "cornin" or related glycosides. Tannins give the bark an astringent, drying quality, which may explain its traditional use on the skin and for upset stomach.

Some laboratory and animal studies have explored possible antiparasitic and antimicrobial effects, and certain extracts have shown effects on heart activity in test settings. These results come from non-human research and do not prove that the herb is safe or effective in people. The active compounds and exact mechanisms in humans are not well understood.

There is not much modern safety information about American Dogwood. Because of this, it is hard to know what doses are safe or whether long-term use causes harm. Laboratory research suggesting that some bark extracts can affect the heart is a reason for extra caution.

People with heart conditions, liver or kidney problems, and children should not use it without medical advice. Pregnant and breastfeeding people should avoid American Dogwood because there is no reliable safety data. If you have any health condition or take medications, check with a pharmacist or doctor first.

Because American Dogwood is not well studied in people, its side effect profile is not clearly known. Bitter, tannin-rich plant barks can cause stomach upset, nausea, or constipation in some people, and may irritate the skin in others.

More serious effects are possible but not well documented. Stop use and seek medical care if you notice a rash, trouble breathing, irregular heartbeat, or other unusual symptoms.

There is no established or standardized dose for American Dogwood. It is rarely sold as a commercial supplement, and reliable dosing guidelines from human studies do not exist.

If you are considering a product that contains American Dogwood, follow the directions on the label and do not exceed them. Most importantly, talk with a pharmacist or doctor before starting it, since safe and effective amounts have not been determined.