I found this at
www.library.thinkquest.com.
"After long researches, it was established that the poisoning effect is due to a colorless, odorless crystalline substance which was called cantharidin, after the French chemist who first extracted it. The lethal dose for a human is about 0.03g. High doses of cantharidin cause excessive salivation, stomach, kidneys and urino-genital system inflammations as well as headache, vomiting and bloody diarrhea. The affected person can develop even seizures but a lethal end is not very common.
This substance was very often mentioned in the old books of pharmacology. People used cantharidin tincture to stimulate the growing of the hair and to heal rheumatism, pneumonia, swellings and gout. Another interesting application of the substance was as an ingredient of “love drinks”. It really increases the sexual attraction but the chasing of extreme effects often led to severe poisonings."
Apparently, there is a certain risk of developing seizures. You know, as an LPN, that there can be severe risks with inflammation in the kidneys especially. You are likely to need medical assistance with handling this probable overdose. I am a RN, not a doctor, but I would be on the way to the emergency room.
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