It is very important for nurses not only to administer the correct medication to each patient, but to know what each medication does and how it works. Nurses should be able to identify all medications they are dealing with, and give an assessment of each. They should know the principles of giving medication, the different components of medication order, the standard timings of medication, and the different routes of medicine administration. Medication is defined as a substance given to cure and a treat a particular diagnosis, or for relief or prevention of disease. It is categorized as a legal drug to be given for its therapeutic effects. When giving medication to a patient, you must remember all the rights and principles of administration, such as the dose, time, and approach. Medications adhere to a very strict set of rules. They must be labeled very specifically, ordered by a doctor, carry a specific dosage and days until it is finished or replaced with another medication. There are four different types of medication orders — a standing order, a PRN order, a one time order and a stat order. It is very important for nurses to know the difference between these orders as they affect the time and dosage given to a patient. Also be knowledgable about the different ways to administer medications — oral medication, parenteral medication — injections/infusions, inhaled medication, suppository medication, topical medications, opthalmic medications — for the eyes, ear medications, and nasal medications. There are also intra spinal and intra cardiac drugs that are injected directly into the spinal cord or the heart. All nurses should maintain standard medication knowledge and try to keep up to date on new medicines in the workplace.