Animal safety tests usually come at the end of a long process of safety data collection that may include testing the product ‘in vitro’ (i.e. in a test-tube) and using a computer program to simulate what might happen to the drug inside the body. The regulations on what safety data is required for a new product vary from country to country (and also from drug to drug), but most drug authorities require all three types of data - animal, in vitro and computer- generated - for trials to be allowed to continue.
All this means that at some point, all (anti-AIDS) drugs will have been tested on animals for safety.
There is an argument however that animals are actually fairly poor substitutes for humans and that some compounds that may well cause no harm to a mouse, could kill a human being. This is particularly the case for drugs that interact with the complex human immune system, such as the anti-inflammatory drug that caused major organ failure in six men involved in a trial at Northwick Park Hospital in London, England in 2006. However, such occurrences are rare.
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