The in situ gel system is one of the polymer-based solutions that show the sol phase transition to gel. In addition to being used to improve bioavailability, this gel is also used to make the drug increase the residence time in the area of use, so that it can provide maximum effectiveness via enhancing of per cent permeation, The use of in situ gel, usually used in ocular administration of drugs, for the treatment of cancer, administration of drugs in the vaginal, rectal, topical, oral, and any route administration. There are many formulations of in situ gel formation that are used for medicinal preparations for many purposes, with different lengths of stay. Searching for articles is done online, browsing the PubMed and Google scholar site with the keyword "Formulation In situ Gel". The fourty articles used, there were 40 in situ gel formulations with gelling agents and also different uses. The purpose of this article review is to look at the superiority of in situ gel formulations and to compare various in situ gel formulations studied from 40 articles used, so that it can be seen which formulation is most often used and has a good effect on drugs preparations.