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Misuse puts you and others at risk
Antibiotics can be lifesavers, but misuse has increased the number of drug-resistant germs. See how this affects you and what you can do to help prevent antibiotic resistance.
If you think antibiotic resistance isn't a problem or doesn't affect you, think again. A prominent example of the dangers of antibiotic resistance is the spread of Mrsa or methicillin-resistant Staphylococcus aureus. Mrsa was once a concern only for people in the hospital, but a newer form of Mrsa is causing infections in healthy people in the community.
Antibiotic resistance occurs when antibiotics no longer work against disease-causing bacteria. These infections are difficult to treat and can mean longer lasting illnesses, more doctor visits or extended hospital stays, and the need for more expensive and poisonous medications. Some resistant infections can even cause death.
Although experts are working to develop new antibiotics and other treatments to keep pace with antibiotic-resistant strains of bacteria, infectious organisms adapt quickly. Antibiotic-resistant bacteria will continue to be a global health concern and using antibiotics wisely is important for preventing their spread.
When is it appropriate to use antibiotics?
Antibiotics are effective against bacterial infections, sure fungal infections and some kinds of parasites. Antibiotics don't work against viruses. The chart shows common illnesses and whether they're caused by bacteria or viruses. Taking an antibiotic when you have a viral infection won't make you feel better and can contribute to antibiotic resistance.
The 2nd source link gives you the effects and interactions common to most, if not all, antibiotics are described in this article. Very informative.

If you have any bothersome side effect, call for medical help immediately. If you don't have anything just ignore and skip the next dose that you already have taken.