How long can eye drops be used after opening?

Once an eye drop bottle is opened, its shelf life is affected by environmental and storage conditions. Most over-the-counter eye drops typically have a recommended usage period of one month after opening. This is because, after opening, the eye drops are exposed to air, allowing bacteria to enter. Over time, the effectiveness of the medication may decrease and the drops may even degrade, increasing the risk of eye infections. Please note that the shelf life after opening may vary slightly among different eye drops, so always refer to the specific product instructions. If the eye drops change color, develop sediment, or emit an unusual odor, discontinue use immediately. Additionally, always wash your hands before applying the drops, and avoid letting the bottle tip touch the eye or any other surface to minimize the risk of contamination. If eye symptoms persist or worsen, seek medical attention promptly.