Well, this topic is very discussive frome differnet sides.
First point of view is the tolerance to animals.

According to this point of view we should be tolerant to annimals, respect their lives and don't test any medications on they, which could hurt them.

Second point of view is about to stay alive in this world

According to this point of view that we should "stay alive in this cruel world". Law of the jungle "every man for himself," "anything goes," "survival of the strongest," "survival of the fittest," "kill or be killed," "dog eat dog" and "eat or be eaten," and so on, according to this point of view we should do anything to stay alive, so we should do animal testing
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As for me, sure, it is miserable to harass our lil brothers, but we should stay alive, should fight with diseases to stay alive

And yes, my English not so good to explain all of my feeling about it, but you feel free to ask me anything and I will answer you