The Spanish Agency for Medicines and Health Products (AEMPS) has launched a Security notice regarding the Dexcom One+ app for iOSThe app, used by many people with diabetes to monitor their glucose levels via mobile phone, has been reported by the manufacturer, Dexcom, Inc. (United States), to the Ministry of Health, which is overseeing the agency responsible for monitoring glucose levels. The agency has been informed of a potential software error in the app by the manufacturer itself.
The problem specifically affects the application versions between 1.5 and 1.6which may not behave as expected. This failure can cause outdated glucose values ​​and old trend arrows to be displayed on the screen for a few moments, with the consequent risk of delaying high or low glucose alerts.
A software glitch that can distort the glucose display
According to the information provided to the AEMPS, the error occurs when the Dexcom One+ iOS app moves from background to foreground on an iPhone or other compatible device after it has been left unused for a while. At that time, the screen may flicker and sequentially display outdated estimated glucose values ​​(EGV) and trend arrows.
During those seconds, the user could see old readings as if they were current before the correct data appears. This can cause confusion, especially for those who rely on automated alerts to make immediate decisions about their treatment, as the system is designed to provide rapid warning of significant changes in glucose levels.
The AEMPS emphasizes that this situation may lead to hypoglycemia or hyperglycemia may not be detected in timeIf the reading displayed on the screen does not reflect the actual glucose status at that moment, the patient's response may be delayed or inadequate, with potentially relevant clinical consequences.
This behavior is similar to that previously described in other applications from the same company, such as the Dexcom G7 iOS and Dexcom G7 Watch iOS versions 2.9.0 to 2.11.2, in which a virtually identical failure pattern had been observed when switching the app to the foreground.
What is Dexcom One+ and who uses this app in Spain?
The Dexcom One+ app for iOS is part of the Dexcom One+ continuous glucose monitoring (CGM) systemThis system allows continuous measurement of glucose levels in the interstitial fluid using a sensor that sends the data to a mobile phone, instead of relying solely on traditional finger pricks.
It is indicated for people over two years of age, including pregnant womenThis means the advisory covers pediatric, adult, and pregnant patients who use this technology as part of their daily diabetes treatment. The system is designed to largely replace capillary blood glucose measurements when making treatment decisions.
The AEMPS reminds us that the correct interpretation of the results from the Dexcom One+ CGM system must be based on the trends and sequential readings that the sensor provides over time, and not in a single isolated measurement. Precisely for this reason, momentarily displaying outdated data can be misleading about the actual direction in which glucose is moving.
In Spain, the Dexcom One+ app for iOS is distributed through the Apple App Store It is used in combination with the corresponding sensor by people with diabetes who need close monitoring of their glucose levels. The AEMPS warning is directed both at those who use the application directly and at caregivers and healthcare professionals who treat them.
Potential risks to patient safety
The main risk identified by the AEMPS is that the user may Failing to notice a significant drop or rise in glucose in time This is due to the display of old readings or delays in application alerts. This can have a direct impact on patient safety.
Let's imagine, for example, that the app shows a seemingly stable value or a flat trend arrow when, in reality, the glucose level is falling rapidly. In that scenario, it's possible that the Hypoglycemia alert: Don't jump when you shouldThis could lead to a serious episode if not addressed quickly. Similarly, a delay in reporting high blood glucose can prolong hyperglycemia without the individual taking the necessary corrective measures.
Furthermore, basing decisions on outdated data can lead to inadequate adjustments in insulin dose or other treatments, increasing the risk of subsequent blood sugar imbalances. The Agency insists that this is not just a matter of convenience or app design, but a problem that can directly impact health.
Therefore, the AEMPS stresses the importance of affected individuals checking which version of the application they have installed and, if it is one of the affected versions, Please update it as soon as possible.It's not just a technical tip, but a safety measure.
Affected versions and mandatory update for Dexcom One+ iOS
The AEMPS warning focuses specifically on the versions 1.5 to 1.6 of the Dexcom One+ app for iOS, associated with product reference SW14244. According to the manufacturer, these versions may not function as expected and may exhibit the described failure when the app is brought to the foreground.
The Agency reports that the Updating these versions to the latest available version is mandatoryDexcom has announced that, as of April 30, 2026, users will no longer be able to use versions 1.5 and 1.6, as they will cease to be operational. In other words, in addition to being insecure, they will be decommissioned.
Therefore, anyone using these versions is urged to update the application as soon as possible, without waiting for the deadline. The goal is to minimize the likelihood of someone continuing to use software that, although it appears to open and receive data, It may display outdated glucose information.
The Spanish Agency for Medicines and Health Products (AEMPS) has become aware of this problem through Dexcom, Inc., the company responsible for the system, based in San Diego (USA), and has chosen to disseminate the warning to users, caregivers and healthcare professionals so that the information reaches Spain widely and quickly.
Recommended steps for patients and caregivers
In its official statement, the Spanish Agency for Medicines and Health Products (AEMPS) includes a series of specific recommendations for patients and caregivers using the Dexcom One+ app on iOS devices. First, it asks users to verify whether they have received a notification within the app itself with the notification issued by the company. This notification explains the problem and details the actions to be taken.
If the user has not seen any such messages, it is advisable to contact Dexcom directly for official information. The company offers various Customer service and technical support channels in Spain, accessible through the contact website (https://www.dexcom.com/es-ES#contacto), the technical support service (+34 900 423 292) and the customer service (es.info@dexcom.com, +34 900 423 292).
The next step is to check which version of the application is installed on the iOS device. The AEMPS recommends checking if the app is among the Affected versions: 1.5 or 1.6If so, the update is not presented as optional, but as a requirement to continue using the system reliably.
To update, the user must access the Dexcom One+ app on their iPhone, tap on the "Update App" option, and then install the latest version available on the Apple App Store. Once the download and installation are complete, it is recommended to reopen the app and check that everything is working normallyverifying that glucose readings and alerts are received correctly.
The AEMPS reminds us that, once April 30, 2026 arrives, the older versions will no longer be operational, therefore Only those who have updated will be able to continue using Dexcom One+ iOS. on their devices. Anticipating that date helps avoid interruptions in daily monitoring.
Specific instructions for healthcare professionals
The regulatory body is not only addressing patients and their families, but is making an explicit appeal for the participation of healthcare professionals who work with people with diabetesPrimary care physicians, endocrinologists, nurses, diabetes educators, and other professionals have an essential role to play in disseminating this type of warning.
The Spanish Agency for Medicines and Health Products (AEMPS) requests that these professionals proactively inform patients using the Dexcom One+ CGM system about the detected flaw in the iOS application. When necessary, they are also asked to provide the notification prepared by the company, especially in cases where the user has not received or read the notification on their mobile device.
Furthermore, they are urged to insist on the need to update versions 1.5 and 1.6 from the Dexcom One+ iOS app, explaining that failure to do so not only exposes users to a potential security vulnerability, but also means they will no longer be able to use the app after the deadline. This support is crucial to ensure that no one is left behind due to a lack of information or technical questions.
In settings where glucose-related decisions are made several times a day—adjustments to insulin, carbohydrate intake, changes in physical activity—coordination between patients and healthcare professionals is essential. The AEMPS warning highlights that Keep health apps up to date It is part of that shared responsibility.
Although the described flaw originates from a software problem, its consequences are potentially clinical. Therefore, the agency reminds healthcare professionals that they must be attentive to these types of regulatory alerts and help their patients interpret and apply the recommendations.
All this warning surrounding Dexcom One+ iOS reinforces the idea that, in everyday digital health tools, A small technical error can lead to incorrect treatment decisions. If it's not corrected in time, updating the app, checking the installed version, and staying in contact with Dexcom support and the healthcare team become essential steps to reduce risks and continue using the system as safely as possible.