It’s unethical but was the best method until recent when computer models are developed to simulate human biology. Animals like mice and rats share many physiological and genetic similarities with humans, animal experimentation can be tremendously helpful for furthering medical science. Rats are killed by people when found inside our house, Isn’t that unethical? We feed on animals everyday, chickens, turkeys, cows, sheep, and even hunters go into the bushes and kill wild animals for eating purposes, Isn’t that also unethical?
On the other hand, there are alternatives method to animal testing, like sophisticated tests using human cells and tissues (also known as in vitro methods), advanced computer-modeling techniques and studies with human volunteers. Some Pharmaceutical companies, medical device manufacturers, and others have started cell-based tests and tissue models can be used to assess the safety of drugs, chemicals, cosmetics, and consumer products.