Otc Sedative For Cats. Like the feliway diffuser, this kit covers up to 700 square feet of space but requires refills. Feliway is a synthetic pheromone and a much safer way to sedate a cat.
The two best over the counter cat sedatives are feliway relaxivet and virbac anxitane chewable tablets. Also known by the brand name benadryl, diphenhydramine is a popular allergy medication that has a side effect of sedation. This product is safe to use and it may help somewhat.