To explore associations among drugs/small molecules, genes and cells. Users can explore the expression, distribution and function of drug perturbation up-/down-regulated genes in cells of tumor microenvironment. The up-/down-regulated genes of drug perturbation were obtained from the CMap Build02 and CMap LINCS-L1000 dataset (https://clue.io/data/). scDrugAct generates comprehensive analysis results. You can select interested drug and dataset on the right and click "Search" button to get the results below, or you can easily change parameters on the results page and click the button (Refresh) next to it to get the results page updated in real time.