Some drug reactions occur in everyone, others occur only in susceptible people.
Amantadine Anti-influenza drug, originally developed for Parkinson's disease, that reduces the duration of symptoms of influenza A. Also works prophylactically. B. Antibody A protein manufactured by a type of white blood cell, called a B lymphocyte, to neutralise an antigen. Any substance that the body regards as foreign and potentially dangerous, and against which it produces antibodies. Many antigens, such as parts of viruses or bacteria, are proteins. Used in vaccines, antigens may stimulate immunity to a specific disease.