A compounded sterile preparation, or CSP, is a medication that a pharmacy prepares from individual ingredients or by manipulating a commercial product, where the final preparation must be free of harmful microorganisms. Common examples include intravenous medications, injectables, and certain eye preparations. Because these products often bypass the body’s normal defenses against contamination, sterility is treated as a core quality requirement rather than a preference.
Preparing a CSP involves specific facility conditions, equipment, and technique intended to minimize the risk of introducing contamination during compounding. National compounding standards provide the general framework pharmacies use to structure these practices, covering areas such as environmental monitoring, personnel training and competency checks, and how preparations are tested or verified before release.
Why it matters
Sterile compounding carries meaningfully higher risk than non-sterile compounding, since an error can directly harm a patient through routes like injection. Because of this, boards of pharmacy and other regulators tend to scrutinize sterile compounding operations closely, and pharmacists working in this area typically need additional training and demonstrated competency beyond general pharmacy licensure. CSPs are also closely tied to beyond-use-date assignment and, when hazardous ingredients are involved, to the additional handling expectations found in hazardous-drug compounding standards.
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