The Concordance Repertory of the Materia Medica by Gentry is designed to enable the physician to find quickly and certainly any desired symptom in the materia medica together with the indicated remedy. Here are some of the advantages of using a concordance repertory:

1. Efficiency: It allows for quick and certain identification of any desired symptom in the materia medica.
2. Comprehensive: It includes all the more characteristic pathogenetic symptoms.
3. Clinical Relevance: It includes only such clinical symptoms as have been repeatedly verified.
4. Suggestive Remedies: When two or more remedies have the power to produce a similar condition, they are included as merely suggestive, under the name of the condition produced.
5. Detailed: The idea, condition, fact, or object of the sentence is given in detail.
6. Originality: Concordance repertories belong to the Puritan group of repertories where the symptoms are given in their original form without much change.

These advantages make the Concordance Repertory a valuable tool in Homoeopathic practice.