It depends entirely on the drug. Advil and LSD are used in completely different ways but are both drugs.
Basically... either medically or recreationally.
All drugs can be useful or harmful, if not taking correctly or for the right reason.
patient info for injectiable drugs
Aspirin.
weed
Neostigmine is preferred for treatment of myasthenia gravis. Pyridostigmine is longer acting than neostigmine.
Most oral drugs or drugs taken by mouth travel to the stomach or intestine where they are absorbed into the bloodstream. These drugs are not effective or useful until they are absorbed into the bloodstream where they are transported to the organ or desired receptor.
Penicillium is important as it is used in production of drugs and food. This is of the genus of fungi and is also useful to the environment.
It is for certain drugs such as Digoxin as they have such a narrow therapeutic index. For drugs with a wide range of therapeutic index, the best measure of safety is the maximum daily dose, its effect on the patient and what other drugs it interacts with. Ask your pharmacist for specific safety questions on your specific drugs.
Drugs are not bad. Certain drugs are inherently nonuseful and others can be harmful if too much is taken, but many are useful tools in medicine and science. The chemicals usually referred to by the word 'drugs' include those that have no decent purpose or use in society or medicine; there is no good reason to use them and many bad ones.
There are a variety of drugs that treat borderline personality disorder. Pschotherapy can also be useful. Drugs include Prozac, Zoloft, Cymbalta, Desyrel, Depakote and Lamictal.
Drugs that help maintain normal blood pressure throughout the body can also help this condition; however, these drugs are only a temporary treatment.
There are many drugs that are useful in fighting a specific disease, yet have side effects such as causing an immunodeficiency. Cancer drugs are a good example of these sorts of drugs. Sometimes a patient must choose the lesser of two evils...