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Because the most resistant bacteria will be the last to die. If you stop the course before every bacterium is dead the resistant survivors will multiply and be much harder to kill next time.

Plus eventually new totally resistant strains would develop somewhere in the world and that might mean the end of the human race.

So EVERYONE, EVERYWHERE, EVERY TIME must finish the prescribed course.


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Dramatic, but true.


Every time someone doesn't finish their course, they risk creating increasingly-resistant strains of the same bacteria.


At best, you don't clear the infection and have to take a second course of antibiotics.

At worse, you find yourself with an infection that you can't clear.


For the sake of a couple of days extra effort, just finish the prescribed course.

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14y ago
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14y ago

Also, If you don't complete a course of antibiotics, you give the bacterial infection/disease opportunity to mutate and build up a resistance to that type of antibiotic.

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Q: Why must you always finish a course of antibiotics?
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Should be within a few days of starting the course, although you MUST always finish the course of antibiotics else you risk creating super strains of bacteria inside your body that are resistant to antibiotic therapy.


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You should only stop taking antibiotics only when directed by your doctor. If your doctor gave you one bottle of antibiotics as your prescription, finish the whole bottle using the instructions on the bottle. Never stop taking antibiotics halfway through your prescription.If you do stop without finishing the prescription, the hidden bacteria in your body will make a comeback, and may be as strong as ever. Thus, to ensure that all the harmful bacteria die, you must finish the prescription unless otherwise directed by a doctor.Basically, only when you have finished the prescribed course or the doctor tells you otherwise, or if you have an adverse reaction. If you stop just because you are feeling better, you will likely relapse.


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You must specify what form of infection you are speaking of to get better answer. But in general, a course of antibiotics either oral or topical will treat the infection.


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