High doses can cause vomiting and diarrhoea. The higher the dose the more severe it is.
As an alterative (blood cleanser) it is used in chronic rheumatism and granular conjunctivitis.
“As an ointment, in the proportion of a drachm to the ounce, it is used in psora, tinea capitis, favus and sycosis, and other skin diseases, causing at first smarting and heat.” Great for skin conditions as an ointment.
It is traditionally used as a lymphatic cleanser and hence can be used in conditions like mastitis. It has a special affinity for red, inflamed mammary glands, testicles and throat.
It is also useful in cases of a sore throat with swollen lymph glands in the neck.