Final answer:
A common side effect of xylazine administration in cats is vomiting. Xylazine is a veterinary sedative that can trigger the vomiting center in the brain, which leads to this side effect.
Step-by-step explanation:
The question asks about a common side effect of xylazine administration in cats. One of the known side effects often observed is vomiting. Xylazine is a sedative, analgesic, and muscle relaxant that is commonly used in veterinary medicine, including in the treatment of cats. When administered, cats can experience side effects, which vary depending on the individual animal and the dose given. Vomiting is considered one of these side effects due to xylazine's capacity to trigger the chemoreceptor trigger zone (CTZ) and stimulate the vomiting center in the brain. It is important for veterinarians and pet owners to be aware of this potential reaction so they can provide appropriate care and monitor the cat's condition following administration of the drug.