Look-Alike Sound-Alike Medications (LASA): Preventing Confusion-Related Errors
What Are LASA Medications?
Look-alike sound-alike (LASA) medications are drugs whose names look or sound similar to other drug names, creating the potential for confusion during prescribing, dispensing, and administration. Examples include hydroxyzine and hydralazine, metformin and metronidazole, and prednisolone and prednisone. The Joint Commission includes LASA medication safety as a National Patient Safety Goal, and the Institute for Safe Medication Practices maintains a comprehensive list of confused drug names. Quality professionals must understand LASA risks and implement organizational strategies to prevent these errors.
Contributing Factors to LASA Errors
Several factors increase the risk of LASA medication errors. Illegible handwriting on prescriptions (in settings still using paper orders), verbal orders where phonetic similarities cause confusion, and similar packaging or labeling all contribute to mix-ups. Automated dispensing cabinets that store similar-sounding medications in adjacent slots can facilitate selection errors. High workload, fatigue, and interruptions during medication preparation further increase vulnerability. Understanding these contributing factors helps quality professionals design targeted interventions that address the specific mechanisms through which LASA errors occur.
Prevention Strategies
Evidence-based strategies for preventing LASA errors include tall man lettering (using uppercase letters to distinguish similar names, such as hydrOXYzine and hydrALAzine), physical separation of similar medications in storage areas, use of both brand and generic names on medication labels, computerized provider order entry with LASA alerts, barcode verification during dispensing and administration, and independent double-checks for high-risk medications. Many organizations maintain an internal LASA list customized to their formulary and review it regularly to add newly identified pairs.
Organizational LASA Programs
A comprehensive LASA safety program includes several components. Pharmacy and therapeutics committees evaluate LASA risks when adding medications to the formulary. Staff education programs raise awareness about LASA risks and reinforce prevention strategies. Incident reporting systems track LASA-related errors and near misses to identify emerging risks. Quality professionals coordinate these program elements, facilitate regular LASA list reviews, and monitor the effectiveness of prevention strategies. Proactive risk assessments, such as failure mode and effects analysis (FMEA), can identify potential LASA vulnerabilities before errors occur.
Technology Solutions
Technology plays an important role in mitigating LASA risks. EHR systems can incorporate LASA alerts that prompt clinicians when ordering medications with similar names. Automated dispensing cabinets can be configured to display warnings and require additional verification steps for LASA pairs. Tall man lettering can be incorporated into electronic medication administration records and pharmacy labels. Quality professionals work with pharmacy and information technology teams to optimize these technology-based safeguards while managing alert fatigue, ensuring that LASA warnings remain meaningful and actionable for clinical staff.