Tall Man Lettering in Pharmacy: Medication Safety Guide

What Is Tall Man Lettering?

Tall man lettering is a medication safety strategy that uses uppercase letters within drug names to highlight the differences between look-alike, sound-alike (LASA) medications. By capitalizing the portions of drug names that differ, tall man lettering draws attention to the distinguishing characters and helps prevent confusion during prescribing, dispensing, and administration.

This simple yet effective technique has been endorsed by the FDA, the Institute for Safe Medication Practices (ISMP), and The Joint Commission as a best practice for reducing medication errors. For pharmacy technicians preparing for the PTCB exam, understanding tall man lettering is essential for both the test and daily practice.

Why Tall Man Lettering Matters

Medication errors involving LASA drugs are among the most common and preventable types of pharmacy errors. When drug names look or sound similar, busy healthcare professionals may accidentally select the wrong medication. The consequences can range from minor to life-threatening. Tall man lettering provides a visual cue that helps differentiate these easily confused medications.

Studies have shown that tall man lettering can reduce medication selection errors by up to 35%. This makes it one of the most cost-effective safety interventions available, as it requires no new technology or equipment, only a change in how drug names are displayed.

FDA-Recommended Tall Man Letter List

The FDA has established a list of drug name pairs that should use tall man lettering. The ISMP also maintains an expanded list. Here are key examples that pharmacy technicians should memorize for the PTCB exam.

• acetoHEXAMIDE vs. acetaZOLAMIDE
• buPROPion vs. busPIRone
• chlorproMAZINE vs. chlorproPAMIDE
• clomiPHENE vs. clomiPRAMINE
• cycloSERINE vs. cycloSPORINE
• DAUNOrubicin vs. DOXOrubicin
• dimenhyDRINATE vs. diphenhydrAMINE
• DOBUTamine vs. DOPamine
• glipiZIDE vs. glyBURIDE
• hydrALAZINE vs. hydrOXYzine
• medroxyPROGESTERone vs. methylPREDNISolone vs. methylTESTOSTERone
• prednisoLONE vs. predniSONE
• sulfADIAZINE vs. sulfISOXAZOLE
• TOLAZamide vs. TOLBUTamide
• vinBLAStine vs. vinCRIStine

ISMP Additional Tall Man Letter Pairs

The ISMP maintains a more comprehensive list beyond the FDA recommendations. Additional pairs that frequently appear in pharmacy practice include the following.

• ALPRAZolam vs. LORazepam
• aMILoride vs. amLODIPine
• ARIPiprazole vs. RABEprazole
• CARBOplatin vs. CISplatin
• ceFAZolin vs. cefTRIAXone
• clonazePAM vs. cloNIDine vs. KlonoPIN
• EPINEPHrine vs. ePHEDrine
• FLUoxetine vs. PARoxetine
• HumaLOG vs. HumuLIN
• OXcarbazepine vs. CARBamazepine
• QUEtiapine vs. OLANZapine
• risperiDONE vs. rOPINIRole
• SITagliptin vs. SUMAtriptan
• traMADol vs. traZODone
• valACYclovir vs. valGANciclovir

How Tall Man Lettering Is Implemented

In Pharmacy Software Systems

Most modern pharmacy management systems incorporate tall man lettering into their drug databases. When a pharmacy technician types a drug name, the system displays it with the appropriate uppercase letters. This integration ensures consistent application of tall man lettering across all prescription labels and computer screens.

On Pharmacy Shelves

Many pharmacies apply tall man lettering to shelf labels and bin labels where medications are stored. This provides an additional visual reminder when technicians select medications from the shelf. Some pharmacies also use color-coded labels or physical separation to further distinguish LASA medications.

On Prescription Labels

Prescription labels may display tall man lettering to help patients and caregivers distinguish between similar medications. This is particularly important in institutional settings where nurses administer medications from labeled packages.

Additional LASA Safety Strategies

Tall man lettering works best when combined with other safety measures. Pharmacy technicians should also practice physical separation of LASA drugs on shelves, use barcode scanning during the dispensing process, read labels completely rather than relying on the first few letters, and maintain awareness of commonly confused medication pairs.

PTCB Exam Preparation Tips

For the PTCB exam, focus on memorizing the FDA-recommended tall man letter pairs and understanding the purpose of the system. Practice identifying which letters should be capitalized in LASA drug names. Questions may present drug names and ask you to identify the correct tall man lettering format or to recognize which medications are commonly confused with each other. Understanding this safety system demonstrates your commitment to patient safety and your readiness for professional pharmacy practice.