Generic selection criteria for safety and patient benefit [XI]: Usability scores of brand-name and generic tapes containing sodium diclofenac by questionnaire survey.

The aim of this study was to evaluate patient satisfaction and usability scores of different tape treatments and examine the scores in relation to the mechanical characteristics of the tape formulation. A questionnaire for the assessment of comfort level and satisfaction with two brand-name (Naboal, Voltaren) and four generic tapes (Yutoku, Teikoku, Rakool, Towa) containing sodium diclofenac was developed and then applied to 12 healthy volunteers. Results showed that Voltaren was difficult to apply to the skin and easier to peel off the skin than Naboal (p < 0.01). Moreover, Rakool was easier to peel than Naboal (p < 0.05). The mechanically measured peeling force was associated with pain during peeling off (r = -0.65), and the measured value of bending rigidity was associated with ease of peeling off (r = -0.97). The knowledge obtained regarding the influence of pharmaceutical properties on the degree of satisfaction with and usability of different tape formulations may be useful for supporting the selection of generic tapes tailored to individual needs or pharmacist preferences, and thus improve treatment adherence and clinical outcomes.