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There's nothing potent enough over the counter that will suit your purposes. A prescription benzodiazepine such as alprazolam (Xanax) might be of value but I have to inject my ferals with a dissociative drug such as ketamine before I can shave away those mats. Please let me know if you a benzodiazepine or a human tranquilizer/anxiolytic drug at home and I'll see if I can give you a dose for it.
Thank you. Unfortunately, there have been sporadic reports of cats developing idiosyncratic (peculiar) hepatic failure after receiving oral diazepam. It's best not administered to cats unless given intravenously.
Many caretakers will see if the sedative effects of an antihistamine such as chlorpheniramine (Clo-Trimeton) dosed at 2 mg will be enough for your purposes. Unfortunately, it rarely is.