Yes, I've also used Drontal. Shortly after I adopted Sky, I noticed that he had tapeworm. Even though he was tested for parasites it didn't pick up the tapeworm. He had been a stray and had fleas before I adopted him. I still don't understand why the Humane Society didn't treat him for tapeworm. He had to take one doseage and then another doseage a few weeks later. Luckily I didn't have to treat all of my other cats. I've heard that the over the counter products just don't work. Drontal should do the job. Good luck.