Black Haw Side Effects and Warnings

Although rare, allergic reactions may occur when taking black haw. If you develop symptoms of an allergic reaction such as hives, closing of your throat; difficulty breathing; swelling of your lips, tongue, or face; stop using black haw at once and seek emergency care

Large doses of black haw may cause: nausea, dizziness, visual disturbances, reduced pulse rate, increased sweating and seizures.

Black haw should not be used by pregnant or breastfeeding mothers. Patients who are allergic to aspirin, and those who have kidney stones are also advised against using black haw.

Do not use different formulations of black haw at the same time, unless instructed by a health care professional. Using different formulations together may increase the risk of an overdose.