Shelf life for codiene linctus once opened?

Once opened, codeine linctus typically has a shelf life of about 6 to 12 months, depending on the specific formulation and storage conditions. It's important to store it in a cool, dry place and to check the expiration date on the packaging. Always consult the product's label or a pharmacist for specific guidance. If the linctus appears discolored or has an unusual odor, it should be discarded.