Drugs of last resort are drugs only used when all other options are exhausted. Many of the best known are antibiotics, antivirals, or chemotherapy agents. In modern usage an antibiotic is a Chemotherapeutic agent with activity against Microorganisms such as Bacteria, fungi or Protozoa Antiviral drugs are a class of Medication used specifically for treating viral Infections Like Antibiotics for Bacteria, specific antivirals Chemotherapy, in its most general sense refers to treatment of disease by chemicals that kill cells specifically those of micro-organisms or Cancer. In those cases, they have the most potent antibiotic, antiviral, or anticancer effects, and/or are drugs for which no (or very few) resistant strains are known. In modern usage an antibiotic is a Chemotherapeutic agent with activity against Microorganisms such as Bacteria, fungi or Protozoa Antiviral drugs are a class of Medication used specifically for treating viral Infections Like Antibiotics for Bacteria, specific antivirals Chemotherapy, in its most general sense refers to treatment of disease by chemicals that kill cells specifically those of micro-organisms or Cancer. They are usually withheld from administration to prevent the development of resistance or due to unpleasant side effects. Drug resistance is the reduction in effectiveness of a drug in curing a disease or improving a patient's symptoms An adverse drug reaction (abbreviated ADR) or adverse drug event (abbreviated ADE) is an expression that describes the unwanted negative consequences
Despite the fact that most of the notable drugs of last resort are antibiotics or antivirals, other drugs are sometimes considered drugs of last resort, such as cisapride. Cisapride is a Parasympathomimetic which acts as a Serotonin 5-HT4 receptor Agonist. [1]