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Side Effects. Drontal has very few side effects and is generally safe. Some cats may vomit after receiving the dewormer. Rarely, a cat might appear disoriented or wobble around for a short time after taking Drontal. If your cat exhibits any side effects, call your veterinarian.
You can administer Drontal tablet orally or mix it in the cat food. There is no need to fast before or after the treatment. Kittens need to treated with Drontal Allwormer at 6, 8, 12 weeks of age then continuing every 3 months. Adult cats need to be administered with this treatment regularly every 3 months.