After what time do you need to use the drops after opening?

Information on the durability of drops after opening should be given on the packaging or in the leaflet. The shelf life of the started drops may vary depending on the manufacturer, composition and type of drops. For example, drops with vitamin C Cebion contain a note that "The drug can be used for 3 months after opening the package. After this period, the residue should be discarded", but for other drops with vitamin C - Ibuvitu C, the recommendations are as follows: "After opening the bottle, the product is durable for at least 6 months, if stored in the recommended way." Please check the information from the manufacturer on the packaging you have at home. I enclose additional information: https://www.gdziepolek.pl/artykuly/jak-przechowywac-leki