Antibiotics can be valuable drugs when used appropriately, however..
The evidence today points that antibiotics are massively oversued and often prescribed for medical conditions that do not warrant them. A prime example is that they are routinely given for colds but many colds are the result of viral infections and while antibiotics kill bacteria they have no effect on viruses.
The use of antibiotics can also result in a variety of side effects due to the way the powerful actions interfere with the delicate balance of the body systems. This can result in the destruction of the friendly bacteria in the body leading to the yeast overgrowth (such as Candida) and interference with nutrient absorption.
Also, you can develop food allergies, immune complications and chronic fatigue syndrome who have a history of recurrent antibiotic treatments.