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Antibiotic suspensions (i.e. Amoxicillin, clavulin, etc.) typically have a shelf life of two weeks if stored in the fridge, at room temperature it is likely it will expire within a week. When suspensions become "expired", drug efficacy is often greatly reduced due to factors such as reduced solubility, dissolution, absorption, drug degradation, crystal formation, etc... Overall an expired suspension will have greatly reduced efficacy and may lead to bacterial resistance which can lead to severe infections - ubc pharm 2014

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What is wrong with medicine after it is expired?

There are many things that can go wrong in a medicine, depending upon what type of medicine it is. Primarily, most medicines can degrade, which means the chemicals weaken. The drug is then less effective for the purpose it is needed. For example, if an antibiotic's chemical make-up weakens, it will not fight the infection as it should if the medication was not expired. When someone with an infection takes an expired medication, the bacteria then continue to multiply, unchecked. The person would get sicker even though taking the expired antibiotic. I would just go out and buy a new bottle or obtain a new prescription.


How do antibiotic resistant bacteria come about?

This term is misleading. The antibiotic "selects" bacteria that are not affected by it. If a person will grow bacteria on a petri dish and add an antibiotic to it, some bacteria may live and grow. This is actually a form of natural selection. The ones that will grow are resistance to the antibiotic. They have some way of not being affected. If a person takes a colony from the plate that has this resistance and grows it on another plate and add the antibiotic, all on the plate will be resistant.


How long does it take for an antibiotic to absorb into your bloodstream?

The time it takes for an antibiotic to absorb into the bloodstream depends on how it was administered. If it was taken orally, it usually takes about 20 minutes to enter the bloodstream. Through IV or injection it happens much sooner.


What role does antibiotic culture and sensitivity play on prescription?

For a frank case of infection prescription of an antibiotic is made from the doctor's clinical experience. Smear, culture, antibiotic sensitivity test report takes time to arrive. After seeing the report prescription is made for the antibiotic to which the patient's microorganisms are susceptible.


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