Most common side effects of antibiotics impact the digestive system. This happens in around 10 percent of the cases.
Side effects of these antimicrobial substances that affect the digestive system include:
- vomiting
- nausea (feeling like you may vomit)
- bloating and indigestion
- abdominal pain
- loss of appetite
These side effects are usually mild and should heal once you finish your course of treatment.
If you experience any additional side effects other than those listed above, you should contact your doctor.
Antibiotic allergic reactions:
In around 15 percent of the cases, patients have an allergic reaction to antibiotics, especially penicillin and cephalosporins.
In most cases, the allergic reaction is mild to moderate and takes the form of:
- a raised, itchy skin rash (urticaria, or hives)
- wheezing
- tightness of the throat, which can cause breathing difficulties
These mild to moderate allergic reactions can usually be successfully treated by taking antihistamines.
But if you are concerned, or your symptoms do not respond to treatment, you should call your doctor.
In rare cases, an antibiotic can cause a severe and potentially life-threatening allergic reaction known as anaphylaxis.
Initial symptoms of anaphylaxis are often the same as above and can lead to:
- a rapid heartbeat
- increasing difficulty breathing caused by swelling and tightening of the neck
- a sudden intense feeling of apprehension and fear
- a sharp and sudden drop in your blood pressure, which can make you feel light-headed and confused
- falling unconsciousness
Anaphylaxis is a medical emergency and can be life-threatening if prompt treatment isn't given.
Tetracyclines and sensitivity to light:
Tetracyclines can make your skin sensitive to sunlight and artificial sources of light, such as sun lamps and sunbeds.

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