(1) In the case where a quantity of compounded drug product in excess of that to be initially dispensed in accordance with WAC 246-878-020 is prepared, the excess product shall be labeled or documentation referenced with the complete list of ingredients (components), the preparation date, and the assigned beyond-use date based upon the pharmacist's professional judgment, appropriate testing, or published data. It shall also be stored and accounted for under conditions dictated by its composition and stability characteristics (e.g., in a clean, dry place on shelf or in the refrigerator) to ensure its strength, quality, and purity.