Figure 2.

Mean total dose, respirable mass, and nonrespirable mass of sample Mexican border town–purchased albuterol metered dose inhalers, µg/actuation.

Mean total dose for each brand illustrated ranged from 57.9 µg/actuation (Assal) to 75.2 µg/actuation (Xeneric-S). Each brand was compared one-to-one and every evaluation showed differences (P < .05) except for 2 comparisons (Sacrusyt vs non-US Ventolin, P = .84; Victory vs Assal, P = .28). The average respirable mass for each brand measured as high as 41.0 µg/actuation (Victory) and as low as 28 µg/actuation (non-US Ventolin). For this parameter, again, all differences between brands were significant (P < .05) except for 2 comparisons (Sacrusyt vs Assal, P = .89; Xeneric-S vs non-US Ventolin, P = .98).