This would be anti-humanitarian.
This would be a horrible decision as it would either halt a lot of drugs or put humans in danger.
Animal trials are meant to show safety & efficiency in a whole biological system. Tests on petri dishes preceded them, but they don't give us enough evidence of safety & efficiency for human trials.
We need to know if a drug is dangerous & it is much better to test that on 100 rats than on a few humans. We also ned to know if the drug gets to where it needs to work (like if I take a decongestant, does it reach my sinuses) & proper dosage for this, which requires a whole biological organism.
We should not torture or harm animals unnecessarily. However, we should require animal testing for things like drug safety before human trials, as animal life is less valuable than human life.