Which inhaler has a window that turns from green to red to indicate a dose was given?

Dry powder inhalers (DPIs) utilize various mechanical designs to ensure patients receive an accurate dose of bronchodilators or corticosteroids. Proper technique is vital, as these devices are breath-actuated and require sufficient inspiratory flow. Manufacturers often include visual feedback mechanisms to confirm that a dose has been successfully loaded and inhaled. These safety features reduce the risk of double-dosing and improve patient confidence in their treatment. Rationale: A. Advair Diskus is a multi-dose DPI that utilizes a dose counter window showing the number of remaining doses. It does not use a color-changing green-to-red signal to confirm individual dose administration. Instead, it relies on a mechanical lever and a numerical countdown. Patients must manually check the number to ensure the device is not empty before use. B. Anoro Ellipta features a simple numerical dose counter located on the side of the device. The Ellipta design is known for its large digits that turn red only when the inhaler is nearly empty (usually at 10 doses remaining). It does not provide a color-coded confirmation for every single puff taken, making it distinct from the Pressair mechanism. C. Tudorza Pressair is specifically designed with a feedback window that turns from green to red. When the patient presses the button, the window turns green, indicating the dose is ready. Upon successful inhalation with sufficient force, the window triggers back to red, confirming the medication has been delivered. This ensures the patient knows the bronchodilator reached their lungs. D. Spiriva HandiHaler requires the patient to insert a capsule into a chamber and pierce it manually. Confirmation of the dose is achieved through a vibrating sound (rattling) of the capsule during inhalation and visual inspection of the empty capsule afterward. It lacks any electronic or mechanical color-change indicator windows, relying instead on auditory and physical feedback from the device. E. Arcapta Neohaler is another capsule-based DPI where the patient must see the capsule spinning and hear a whirring sound during the breath. Like the HandiHaler, it provides visual confirmation through a clear chamber, but it does not utilize a chromatic window transition. The absence of a green-to-red indicator distinguishes its user interface from the Pressair technology.