May interact with medications
When it says that an ingredient in dog food may interact with medication, this means that the ingredient in question could affect the effect of any medication your dog may be taking. These interactions can be varied and can both increase and decrease the effectiveness of the medication or cause unwanted side effects.
It is important to consider such information, especially if your dog needs to take medication on a permanent or temporary basis. Examples of such interactions may include a change in the absorption of the medication in the body, an effect on metabolism or a direct chemical reaction that alters the effectiveness of the medication.
To ensure that your dog's health is not affected by such interactions, you should always seek the advice of a veterinarian before changing your dog's diet or medication. The vet can give you specific advice on which ingredients could be problematic and how you can adjust your dog's diet to best suit their health needs.