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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.
Clindamycin may cause certain side effects in some animals. The most common possible side effects associated with this medication are diarrhea, vomiting and loss of appetite. The oral suspension formulation of clindamycin can be especially bitter. It is not uncommon for cats to attempt to refuse the medication or start drooling after a dose has been given.