With any rodenticide, please make sure you read and follow all the directions on the label, keep it away from non-target animals, children, and check to make sure your municipality allows its use.  Ask staff if you have questions about how to use it or require advice on integrated pest management.  If it is a commercial strength product, make sure that you have an applicator licence (through the Ministry of Environment) before putting it out, or if you do not have one, you need to get someone who does to apply it for you.