There are four important groups of drugs. Some drugs are used to fight bacteria. These drugs include antibiotics and sulfa drugs. Sulfa drugs are prescribed to treat diseases like pneumonia, meningitis and flu. Flu is short for influenza.
Some drugs prevent diseases.
These drugs may be vaccines, antiserums or globulins. Vaccines A vaccine causes the body to produce substances called antibodies. Antibodies travel through the bloodstream and fight a particular disease. The body then builds up resistance to this disease. Vaccines have been used to fight diseases like polio, hepatitis, cholera, measles, mumps and smallpox.