Few side effects are linked to hyssop when taken in small doses. At high doses, vomiting and seizures have been reported.
Hyssop may interfere with anti-seizure medications, anti-diabetes medication, or medications that suppress the immune system.
Do not give hyssop to children. Do not use hyssop if you are allergic to it or to any plants from the Lamiaceae family. See your doctor before taking hyssop if you are pregnant or breast-feeding; and if you have epilepsy, fever, or diabetes.
Before taking any new medications, including natural health products, speak to your physician, pharmacist or other healthcare provider. Tell your healthcare practitioner about any natural health products you may be taking.