In this Article
There isn't enough information to know if black horehound is safe when applied directly to the skin or used rectally.
Special Precautions & Warnings:Pregnancy and breast-feeding: It's LIKELY UNSAFE to take black horehound by mouth if you are pregnant. Black horehound may affect the menstrual cycle, and this could threaten the pregnancy. It's also best to avoid putting black horehound on the skin or using it rectally during pregnancy, since safety of these uses is unknown.
If you are breast-feeding, don't use black horehound either. The possible effects on the nursing infant are unknown.
Parkinson's disease: Black horehound contains chemicals that affect the brain. There is some concern that black horehound might affect treatment for Parkinson's disease.
Schizophrenia and psychotic disorders: Black horehound contains chemicals that affect the brain. There is some concern that black horehound might harm people with schizophrenia and psychotic disorders.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.