"Drug interactions per se are no threat to a patient; a physician's ignorance either through lack of knowledge of interaction or through lack of adequate observation of the patient and proper interpretation of new events is dangerous."
- Kenneth Lloyd Melmon, Howard Fred Morreli,1978

"All substances are poisonous, there is none which is not a poison; the right dose differentiates a poison from a remedy"
- Paracelsus, circa 1538