Feliway is a synthetic pheromone used to help your cat feel more relaxed at home. Pheromones are a type of chemical communication that all cats use to interact with each other and the world around them. These natural chemical messages are released from special glands around their bodies and are very safe. People and other animals are not affected by cat pheromones. Feliway Classic mimics the natural pheromones that send calming messages to cats. This helps reduce stress-related behaviors such as hiding, scratching, or spraying.