28 Pa. Code § 25.92
Each manufacturer and each distributor, as to material removed by it from the manufacturer's original container and repackaged, shall insure that the label of the immediate container or the immediate container itself of a drug or controlled substance bears characteristic markings or numbers commonly referred to as "lot" or "control" numbers, to make it possible to determine the complete manufacturing history of the package of the drug.
28 Pa. Code § 25.92
This section cited in 28 Pa. Code § 551.3 (relating to definitions); 49 Pa. Code §18.6a (relating to prescribing, dispensing and administering drugs); 49 Pa. Code §18.158 (relating to prescribing and dispensing drugs); 49 Pa. Code §21.284a (relating to prescribing and dispensing drugs); 49 Pa. Code §25.177 (relating to prescribing and dispensing drugs, pharmaceutical aids and devices); and 49 Pa. Code §43b.7 (relating to schedule of civil penalties-pharmacists and pharmacies).