A package insert refers to the written information that comes along with a medication or a product, providing important details about how to use it safely and effectively. Full definition
Read labels and package inserts carefully and follow all directions closely — each time you use the product. (healthcommunities.com)
Keep package inserts as they usually contain more detailed information than the outer packaging concerning any possible toxic hazards. (icatcare.org)
Keep package inserts handy, just in case, there should be an adverse reaction and seek immediate veterinary attention in the case of a reaction. (notinthedoghouse.com)