In the period of the Three Kingdoms, traditional Korean medicine was mainly influenced by other traditional medicines such as ancient Chinese medicine. In the Goryeo dynasty, a more intense investigation of domestic herbs took place: The result was the publication of numerous books on domestic herbs. Medical theories at this time were based on the medicine of Song dynasty, but prescriptions were based on the medicine of the Unified Silla period such as the medical text "First Aid Prescriptions Using Native Ingredients" or "Hyangyak Gugeupbang" (향약구급방), which was published in 1236. Other medical journals were published during this period like "Introductory Guide to Medicine for the General Public" or "Jejungiphyobang" (제중입효방).