Efficacy of contrasting background on a drug label: A prospective, randomized study

Medication error can occur due to fault at any level starting from manufacturing until the administration to the patient. It can be difficult to read the drug name and other information from an ampoule, if there is poor contrast between the font color and background of the ampoule. Primary aim of this study was to evaluate the efficacy of the contrast color on the ampoule's label.

The study was conducted in a randomized blinded manner at a tertiary level trauma center. One hundred and eight resident doctors participated in the study. All the participants were divided into two groups after randomization. Group A was given the original drug ampoule while the modified ampoule with contrast was given to Group B. Total time in reading the ampoule and difficulty in reading (DR) scoring were noted for each participant. Another scoring regarding correct reading of ampoule was also noted and compared.

Student's t-test and Mann-Whitney test were used accordingly and P < 0.05 was considered as significant.

It was found that mean time taken in reading the original ampoule was more compared to modified ampoule (11.64 ± 1.48 vs. 9.48 ± 1.62 seconds P < 0.05). DR score was also higher in Group A (P < 0.05) and correct reading score was more in Group B (P < 0.05).

The labels on drug ampoules or vials should always have a contrasting background. This may reduce medication error and improve patient safety.