How to use a Drug's Ingredient List for Allergy Alerts

Drugs that are prescribable have ingredients listed by name and RXCUI. (remember the RXCUI may not be prescribable, but it is an ingredient)

For example: Drug the patient is allergic to stored under the drug name: Codeine.
Prescriber tries to write a drug with one of the ingredients = Codeine - then show drug allergy alert.
In the NewRx field, it is a good idea to always send the patient's known drug allergies, so if something is ignored or missed the pharmacist has a chance to catch it.