Few side effects are linked to hyssop when it is taken in small doses. At high doses, vomiting and seizures have been reported.
Hyssop may interfere with anti-seizure medications, agents that lower the seizure threshold, anti-diabetes medications, cholesterol-lowering medications, antivirals, or medications that suppress the immune system.
Do not give hyssop to children under 18 years old due to possible risk of seizures. 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 or if you have epilepsy, fever, high blood pressure, or diabetes.
Avoid prolonged use of hyssop oil (around 10-30 drops/day for adults) due to increased risk of seizures.
Before taking any new medications, including natural health products, speak to your physician, pharmacist or other health care provider. Tell your health care practitioner about any natural health products you may be taking.