Law of Similars

The Law of Similars (similia similibus curentur — "let like be treated by like") is the foundational principle of homeopathy: a substance that produces a specific pattern of symptoms in a healthy person can, when potentized, address a similar pattern in a sick person. Its key implication is that every prescription depends on matching the remedy to the individual's symptoms, not the disease label. For a full exploration, see The Law of Similars.

In Practice

The Law of Similars operates as a matching principle. A practitioner gathers the patient's complete symptom picture — the totality of symptoms — and searches for the substance whose known effects most closely mirror that picture, as established through systematic provings on healthy volunteers.

The closer the match between the proven symptom picture and the patient's actual symptoms, the more effective the prescription is expected to be. The ideal match — the simillimum — represents the remedy whose picture corresponds most precisely to the individual case. This is why individualization is essential: the Law of Similars requires matching the specific person's experience, not merely the diagnosis.

Historical Context

Samuel Hahnemann first articulated the Law of Similars in 1796, following his self-experiment with Cinchona bark. He formalized the principle in the Organon of Medicine (1810), though the concept has earlier roots — Hippocrates noted the idea, and Paracelsus explored similar reasoning in the sixteenth century. Hahnemann's contribution was systematizing it into a reproducible clinical method.

Related Terms

• Simillimum — the single remedy whose symptom picture most closely matches the patient
• Proving — the method by which a remedy's symptom picture is established
• Totality of Symptoms — the complete symptom picture against which the Law of Similars is applied

Learn More

• The Law of Similars — full exploration of this foundational principle