Your vet has prescribed a dose which is lower than that generally recommended by the manufacturers. I would presume that your vet has good reason to do this and so I would suggest you do not go against that without talking to your vet about it first. These tablets can be associated with stomach and other problems, and if given at the full dose, a maximum of a 5 day course is recommended at a time. The higher the dose and the longer they are given for, the greater the chances of some unwanted side-effect. They can be very helpful and effective though if used carefully.