Allopathy is a term used by Homeopaths to designate all systems of medicine other than homeopathy. Modern medicine is based on proven scientific principles, which are evidence-based rather than the anecdotal principle of homeopathy. The debate over natural versus synthetic chemical used for treatment is complicated and comprises many issues. Without going into details, anything can be a poison in large amounts. Most poisons are natural. And certain poisonous chemicals can also be used in treatment, if used judiciously by experts.