[jacquesm]

That depends on the side effects and the dose required+. So no, you can't just draw that conclusion.

+ edit: , etc...

Thanks Cthulhu_.

[Cthulhu_]

And of course whether parasites can adapt to become resistant (?) to the treatments.

[jacquesm]

There are probably many other factors that I should have listed there, my bad, I did not mean to make an exhaustive list, in fact the opposite, that's the first two things that came to mind.