The mobile APP for medication guidance related to pharmacogenomic is developed to solve various practical problems, such as inconvenient reading of English database, slow updating of paper reference books and lack of shortcut for access.We extracted the medication guidance information related to the pharmacogenomic from ‘Dosing Guidelines’(http://www.pharmgkb.com), ′Table of Pharmacogenomic Biomarkers in Drug Labeling′(http://www.fda.gov/drugs/scienceresearch) and relevant authoritative books.SQLite was used to build the medication guidance information database.We designed and implemented a mobile APP for medication guidance by JavaScript programming language.The APP contained 197 drugs that have been extensively studied and have high levels of evidence.It covered 25 categories, such as anticoagulant and antiplatelet drugs, general antitumor, immunosuppressant drugs, targeted antitumor drugs, antipsychotic drugs, antiepileptic drugs, and proton pump inhibitors and so on.Users can obtain clinical significance and guidance information related to the genotype of the drug by entering the pinyin initials of the generic name of the drug.The mobile APP for medication guidance related to pharmacogenomic based on APICloud could provide practical and convenient pharmaceutical information service for clinical use.