“Recommended for my dog, who I adopted before finding out that he had heartworms. I immediately sought treatment at our vet and she recommended that I begin a monthly heartworm preventative. My dog does have a history of seizures and she recommended this particular brand for his seizure condition. It's never caused him any adverse effects after ingesting this nor has it caused him to ever have a seizure as a result of this medication. Allivet is very helpful with coordinating with your vet to obtain the prescription for this product and takes care of obtaining the prescription order from the vet for you so you don't have to worry about trying to send them prescription verification yourself through mail, email, or fax. Thanks Allivet! Plus, it's the best place to order also because of the lowest price.”