Once reconstituted, amoxil suspension should be thrown away after 30 days. It loses its potency. This occurs even faster if it is not refrigerated after reconstitution. While in powder form (before it is mixed) it can last quite some time. ==ADDITIONAL INFORMATION TO CONSIDER == Studies show that expired drugs may lose some of their potency over time, from as little as 5% or less to 50% or more (though usually much less than the latter). Even 10 years after the "expiration date," most drugs have a good deal of their original potency. If your life does not depend on an expired drug - such as that for headache, hay fever, or menstrual cramps - take it and see what happens. One of the largest studies ever conducted that supports the above points about "expired drug" labeling was done by the U.S. military 15 years ago, according to a feature story in the Wall Street Journal (March 29, 2000), reported by Laurie P. Cohen. Here are a couple of resources as well: https://www.health.harvard.edu/fhg/updates/update1103a.shtml http://www.baliadvertiser.biz/articles/paradise/2006/expired_drugs.html
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Provided it is stored correctly, liquid amoxicillin will remain effective until the "use by" date stated on the label. It is worth noting, however, that any course of antibiotic medicine should be completed by the patient.
Amoxicillin is a is a broad spectrum antibiotic from the family of penicillin, which is good for up to ten (10) days after taking the first dose. It should be taken for ten consecutive days to prevent development of resistance to the drug.
Before usage the antibiotic is good until the expiry date, which is usually located on the box or the bottle.