I don't understand how anyone can have bottles of antibiotics laying around. Don't you guys take the whole prescription when you get it?
Do you realize that doctors will give you only what you need? And that every last pill should be taken. Even if you are feeling better, you are supposed to take all of your antibiotics. Germs constantly adapt to their environment and have the ability to take on the characteristics of other germs. When antibiotics are used inappropriately (i.e not taking the full regiment of pills), the weak bacteria are killed, while the stronger, more resistant ones survive and multiply. Germs that develop resistance to one antibiotic have the ability to develop resistance to another antibiotic. This is called cross-resistance.