<unk>  or<unk> ' law is a claimed law concerning the effects of pharmaca or poisons in various concentrations. It states that: That is to say, highly diluted pharmaca or poisons enhance life processes, while strong concentrations may inhibit these processes and even terminate them. The rule was named after Hugo Paul Friedrich<unk>  and Rudolf<unk> . The latter originally formulated it in 1888. However, the exceptions to the rule are so numerous that it can not be considered a general law. For instance, many paralysing substances have no exciting effect in weak doses, and what constitutes a weak, medium, or strong stimulus is highly individual, as pointed out by<unk>  himself. The rule is no longer cited in modern pharmacology texts, having been supplanted by the theory of hormesis.
Arndt–Schulz rule
Goldwater rule
Wallace rule of nines
Eichler's rule
Reed's rules
Westgard rules
Köllner's rule
Clark's rule