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)

Prescriber picks a prescribable drug.
Your system should then look up the ingredients of this drug by NAME of the ingredient.
Then compare the NAME of the ingredient to the Drug NAME of the drug the patient is allergic to which you store.

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.