It should be noted that the case for "take the antibiotics until the very end of your prescription" isn't as strong as it was some years ago.

The assumption was that if you don't take them until the end, strains immune to the antibiotics would survive, making them less effective in the long run. But the problem with this way of thinking is that the bacteria that gains immunity will survive it anyways – in fact a longer exposure to antibiotics rewards the trait of immunity, as evolutionary pressure is higher. There are fewer strains to compete against, as these have been killed by the antibiotics, making the unwanted mutations more likely.

Antibiotics resistance mostly comes from long time exposure to them. At least that's my understanding, not an expert in the field.