If you’ve never taken X how do you know you’re allergic? I don’t think many drug boxes list all the ingredients either. Such a stupid requirement to have to say that.
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If you’ve never taken X, you can probably assume for the sake of argument that you’re not allergic to it unless you have some reason to believe otherwise (although it’s a good idea to mention whether you’ve had a particular thing before to your doctor). Usually in medicine you’re concerned about *known* allergies, since most people are not allergic to most things, although in rare cases you’re cautious with something new if it’s a common allergy or if someone is known to have lots of allergies to begin with.
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