For Quality, Essential, Generic Medicines
Chapter 1: About Drugs in General    

While antibiotics act against infections, they may not relieve symptoms directly; in such cases additional medication such as painkillers to relieve pain and fever may be prescribed until the antibiotics start to take effect.

As with all medicines, the complete course of medication must be prescribed and complied with by the patient even if all symptoms seem to have disappeared or the patient "feels better". Failure to complete the course can lead to the infection again and worse result in the long-term in resistance to the antibiotic.

The other reason for increase in antibiotic resistance is wrong prescription or using a stronger second or third generation antibiotic (like norflaxacin) when a first-generation (like amoxycillin or doxycycline) would do. Also, antibiotics, for instance, may lower the natural immunity of the body to certain kinds of yeast which in turn mat lead to fungal infections in the mouth, throat and vagina. An anti-fungal drug would need to be prescribed then.

Nausea and diarrhoea are rather common side-effects of antibiotics. Do not normally stop the antibiotic in such cases. The most common risk, particularly with penicillins and cephalosporins, is allergic reactions that cause rashes and sometimes swelling of the face and throat. If this happens the drug should be stopped and immediate medical advice sought. Some people are sensitive to particular types of antibiotics, say the penicillins, and this can lead to serious adverse reactions.

A rarer, but more serious and fatal, disorder occurring especially with the lincosamide class of antibiotics is a disorder called pseudomembranous colitis, in which bacteria that are resistant to the antibiotic multiply in the bowel, causing violent, bloody diarrhoea.

Antibiotics must be used with caution.

This baby is breastfed
Such babies hardly need drugs
Source : The Indian Academy of Pediatrics  

Common Antibiotics Drugs

Penicillins Tetracyclines
Amoxycillin Doxycycline
Ampicillin Oxytetracycline
Benzylpenicillin Tetracycline
Phenoxymethylpenicillin Macrolides
Procaine Penicillin Erythromycin
Cephalosphorins Azithromycin
Cefaclor Roxithromycin
Cephalexin Lincosamides
Cephazolin Clindamycin
Cephatoxime Lincomycin
Aminoglycosides Ciproflaxacin
Gentamicin Norflaxacin
Netilmicin Other Antibiotics
Streptomycin Chloramphenicol