Depending on the orientation of the canister, the patient then estimates the amount of medication left. They actuated each device into free air at two-minute intervals. The canisters were actuated until no visible spray was produced. Each of the three brands of MDIs tested had a unique floating pattern both prior to actuation and at each of the testing levels. The researchers concluded that floating is not an accurate means by which patients can identify the amount of medication contained within an inhaler device.
Inhaled medications are critical in providing long-term control and rescue relief during an attack.
Relying on the float test to determine the amount of medication remaining is an inaccurate and potentially dangerous proposition for asthmatics. This information is provided for educational purposes only. Please read the disclaimer .