Clemastine 2.68mg

Hi, my vet just put my very large dogs (2) on these pills twice a day for allergies. I paid 52.00 for a bottle of 100 at the vet and really can't afford that much every month. I noticed that you sell Clemastine Fumarate 2.68mg and was wondering if this is the same thing. The vet says I should keep them on it for about 4 or 5 months out of the year because they had the same problems last year and that would get so costly for me. Thanks Dede