Why do you need to take penicillin until all gone?
October 6th, 2009
josob18 asked:
Ok, my friend told me that he has a tooth ache and so he took some left over penicillin from the last time his dentist gave him some. In other words he did not take the full dose the prior time he had a tooth problem (about a year ago, so he now took it to relieve the symptoms this time. But of course he will not have a full dose for this episode. I was trying to tell him why this is all bad to be doing, but could not remember specifically why. Please help me find a way to explain it to him.
Ok, my friend told me that he has a tooth ache and so he took some left over penicillin from the last time his dentist gave him some. In other words he did not take the full dose the prior time he had a tooth problem (about a year ago, so he now took it to relieve the symptoms this time. But of course he will not have a full dose for this episode. I was trying to tell him why this is all bad to be doing, but could not remember specifically why. Please help me find a way to explain it to him.
Categories: Dental | Tags: Dentist, Last Time, Tooth Ache



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Because you often start to feel better before the infection is gone, so if you stop taking the antibiotic then you might get reinfected. You also select for resistent bugs, so if you remove the antibiotic you allow these to grow, potentially creating a superbug.
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The reason that you need to take all of antibiotics is that the bacteria can build a resistance to antibiotics. If a bacteria becomes resistant to an antibiotic, that antibiotic won’t kill the bacteria which means you would have to take a different antibiotic. There are some strains of bacteria that are resistant to lots of antibiotics and are difficult to treat. So you should take antibiotics as directed by the doctor.
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He needs to take the full amount of penicillin the doctor prescribes for him even if he gets to feeling better and thinks that he is well because the penicillin kills out a few of the microbes and germs at a time. If he takes the medication for the full course, he will be sure that all of the germs are killed.
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Because it’s not a sufficient dose to kill the infection, and it will contribute to the prevalence of antibiotic resistance. This won’t be some abstract prevalence that’s unrelated to your friend. He will carry antibiotic resistant organisms that could cause an infection and won’t be easily wiped out. He could also give the infections to others. All in all, it’s a bad idea to save antibiotics.
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Often the symptoms of an infection will resolve before the full course of an antibiotic is taken, but it should still be completed because it is possible that some bacteria survive the initial days of the treatment, in order to make sure to kill them all, it’s important to take a full course. In the case where an incomplete course is taken, it may be the case that not enough of the bacteria are killed by the antibiotic and the remaining bacteria (which will be the most resistant) will simply multiply and re-establish the infection, but now they will likely be more resistant to the antibiotic that was used.