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Can I give my cat work medicine if she's taking flea medicine already? - cat flea medicine

My kitten Effy under the smart medicine first and foremost, I have the ninth month and will enter the next nine birth. A months I have noticed small white worms out of his butthole and I gave him worm medicine in his food, and it worked. I realized a few days ago, that is the work again, and wondered whether it is safe to return to pass through or interfere with the flea medicine and something bad?