Anbesol should not be used if you are allergic to any of the ingredients, if you have an infection in your mouth or throat such as a cold sore or thrush, or if you are taking other medicines that may interact with Anbesol. It is also important to read the label thoroughly before using this product and to speak with your doctor first if you have any concerns. In addition, children under the age of 12 should not use Anbesol without consulting their doctor first. Finally, it's best to avoid using Anbesol during pregnancy unless advised by a healthcare professional.