We conducted a literature search on 2 major electronic databases, PubMed and Scopus, to identify studies on the use of mobile apps for medication adherence. The SPIDER framework was used to structure the research question and guide the literature search (Multimedia Appendix 1). The key search terms included “Asia,” “chronic disease,” “app,” “application,” “survey,” “experiment,” “questionnaire,” “group,” “medical adherence,” “medication adherence,” “case-control,” “cohort study,” “randomized controlled trial,” “clinical trial,” “observational study,” “qualitative research,” “mixed methods,” and “analysis,” within the timeframe from January 2019 to August 2024. These terms were combined using logical operators “OR” and “AND” and were restricted to searches within titles and abstracts only (Multimedia Appendix 2).

The initial screening of titles and abstracts was conducted by the first author [TW]. We used Endnote to detect and delete duplicates, followed by a manual verification by the corresponding author [YMH] to ensure no duplicates were overlooked. After the initial screening of titles and abstracts, a thorough full-text review of selected articles was conducted by 2 reviewers [TW and YMH], adhering to the inclusion and exclusion criteria outlined in Textbox 1. Any discrepancies between the reviewers were resolved through discussion, and if necessary, a third reviewer [HYC] was consulted to reach a consensus. In addition, hand-searching of grey literature was conducted to identify further relevant papers during the full-text review process.

Two reviewers [TW and YMH] performed the data extraction process. We jointly decided to extract data from the full-text articles using a pre-established form, which was developed based on literature reviews [10,19,28]. The form encompassed study characteristics, including author, country, and year of publication, as well as details regarding the developer of the mobile app, target population, features, usability, and use of the mobile app. In addition, we documented any additional information about app features not covered in our predefined form. These features of mobile apps across the studies would subsequently be evaluated and compared in our review.

The findings are depicted in a narrative table (Table 1), evaluating which apps exhibited the most optimal features using a modified mobile app rating scale derived from literature reviews [10,19,28]. A 10-item evaluation sheet was used to determine the number of features captured by each selected app, with a score assigned based on the total number of items covered (Table 1). A higher score indicated that the mobile app possessed more functions to enhance medication adherence. We summarized and juxtaposed the apps from the selected studies based on their respective disease focus, developers, target users, features, usability, and use. Consequently, we compared and delineated the similarities and disparities in the features of these apps, proposing the ideal features of available apps for enhancing medication adherence.

We initially found 247 articles on PubMed and 150 on Scopus. After removing 64 duplicates, we were left with 333 studies. From this pool, 156 irrelevant articles were excluded based on title and abstract screening. Afterwards, 177 articles underwent full-text review for eligibility assessment. Among these, 167 articles were excluded for various reasons, 20 were not primary research, 68 were not conducted in Asia, 31 did not use mobile apps as an intervention or did not provide detailed information about the mobile apps, 24 did not pertain to the association between medication adherence and mobile apps, and 24 were not relevant to chronic diseases. Ultimately, 14 studies [29-42] were included in our review, with an additional 4 results [32,33,35,39] obtained from hand-searching, as illustrated in Figure 1.

The majority of the studies (9/14, 64.3%) were conducted in East and Southeast Asia [29-31,37-42], with the remaining studies conducted in India (1/14, 7.1%) [32], Iran (2/14, 14.3%) [33,34], Jordan (1/14, 7.1%) [35], and Kazakhstan (1/14, 7.1%) [36], respectively. All the studies investigated the use of mobile apps to improve medication adherence among patients with chronic diseases, defined as conditions lasting 1 year or more, requiring ongoing medical attention, or restricting activities of daily living. Among these studies, 4 (28.6%) targeted patients with cardiovascular diseases [29,31,33,36], 3 (21.4%) focused on diabetes mellitus [32,37,40], 2 (14.3%) on HIV management [30,41], 1 (7.1%) on schizophrenia care [42], 1 (7.1%) on asthma treatment [35], 1 (7.1%) on rheumatoid arthritis [39], and 2 (14.3%) included patients with various chronic diseases and polypharmacy [34,38].

Among the mobile apps in these studies, 11 (78.6%) were developed by research teams [29-35,38,39,41,42], while 3 (21.4%) were existing apps developed by commercial companies or hospitals [36,37,40]. The features of the 14 mobile apps are summarized in Table 1, showing significant differences among them. All of the selected apps incorporated multiple features to improve medication adherence. Reminders were the most commonly used feature, while patient community forums were the least integrated feature in the app design.

In total, 12 (85.7%) apps featured a reminder function primarily aimed at reminding patients to take their medications as scheduled [29-36,38-40,42]. Some of these apps also provided reminders for follow-up appointments [30,31,33,35,40], prescription refills [40], or monitoring health status (eg, body weight, blood pressure, or blood sugar) [31,33,35,40]. Out of 14, 6 (42.9%) apps offered lifestyle modification functions by providing dietary and exercise recommendations and generating individualized plans and monitoring [29,31-33,36,37]. Furthermore, 6 (42.9%) apps included health data recording and monitoring functions (eg, body weight, blood pressure, and blood sugar) [29,31-33,36,37], with 4 (28.6%) allowing users to export and share these records with researchers or health care professionals [29,32,33,37]. Two (14.3%) other apps, while unable to record health data, allowed medication intake records to be uploaded and shared with researchers or health care professionals [31,36]. A higher proportion of the apps we reviewed had communication features with researchers or health care professionals. Specifically, 10 (71.4%) apps enabled users to receive feedback from researchers or health care professionals during their usage [30-37,40,42], and 7 (50.0%) apps offered web-based consultation services [30,31,34,37-39,42]. Furthermore, some apps took measures to reinforce patients’ willingness to adhere to medications. Eight (57.1%) apps included educational content for patients [29-31,33-36,39], while 7 (50.0%) used motivation strategies to encourage adherence [31,33,35-38,42]. Only 1 app (7.1%) offered a patient community forum, allowing patients to share and discuss their experiences with medication and disease management with peers and caregivers in a safe space [31].

Several unique features were identified across the selected apps in this review (Multimedia Appendix 3). HeartGuardian (Liu et al) supported the management of lipid levels and improved medication adherence by tailoring detailed health plans for patients, recording medication intake, and providing real-time video feedback based on their adherence [29]. Medisafe app offered an easy-to-use reminder feature to help patients take their medications on time while also tracking blood pressure or blood sugar levels. It also assessed patients’ health data and medication adherence and allowed caregivers to supervise medication intake [40]. Pang et al [41] created the Mobile Interactive Supervised Therapy (MIST) system to monitor medication adherence among people with HIV, requiring patients to upload videos of their medication intake for researchers to review. Chew et al [38] developed the Med Assist app, which included a 2-way alarm reminder system, allowing users to take medications later if they miss the scheduled time. It could also summarize all medications that patients had to take into a single page and help caregivers supervise medication usage. Furthermore, patients could use the Med Assist app to check medication availability at partnered pharmacies, making prescription refills more convenient. The Med Assist app also featured an adherence scoring system, incorporating gamification where users earned rewards for achieving app objectives [38]. DIAGURU, a mobile app created by Sunil Kumar et al for diabetes management, was capable of recording and monitoring patients’ blood sugar levels, insulin usage, and food intake to generate visualized reports and graphs as feedback [32]. In addition, DIAGURU could calculate the caloric value of food intake and provide dietary recommendations based on patients’ sugar levels and the caloric consumption [32]. Poorcheraghi et al [34] designed a medication management app targeting older adults, featuring user-friendliness, adjustable font and text sizes, and appropriate background and app item colors. The app recorded the names and images of medications and would audibly announce the medication names and show their pictures when playing the reminders [34]. Asthma mHealth, developed by Al-Nawayseh et al [35], focused on educational functions, providing patients with detailed introduction about asthma and using short videos to demonstrate correct inhaler usage.

Finally, only 5 studies (35.7%) included descriptions of privacy protection measures [30,31,34,39,40]. The most detailed information was provided by Chen et al [31], who implemented user authentication, data encryption for both transmission and storage, and strong password protection for the iCARE app. In addition, the iCARE featured backup and recovery functions and used MongoDB (one of open-source NoSQL databases) for its flexibility and security [31]. The app’s development also adhered to international and national data standards [31].

Although the majority of studies in our review were still in the early stages of app development and pilot testing, 12 (85.7%) reported improvements in clinical or humanistic outcomes [29,31-38,40-42]. As summarized in Table 2, these findings underscore the potential effectiveness of mobile apps in enhancing patient outcomes from clinical and humanistic perspectives.

Six (42.9%) studies highlighted that mobile apps lead to clinical improvement [29,33-35,37,42], including blood glucose, blood pressure, blood lipids, disease status, reduction in medication associated adverse events, and increased physical activities. In addition, 12 (85.7%) studies reported positive humanistic outcomes such as increased medication adherence, improved quality of life, and positive attitude toward the mobile apps, including satisfaction, usability, and ease of use [29,31-38,40-42]. Among these, 8 (57.1%) studies noted better medication adherence in intervention groups using mobile apps compared with control groups [29,33-37,40,42]. Furthermore, 7 (50.0%) studies included in our review assessed users’ attitudes toward the mobile apps [31,33,35,37,38,40,41]. Of these, 6 (42.9%) reported positive user attitude and satisfaction with the apps [31,33,35,37,38,40], 6 (42.9%) considered the apps useful and beneficial [31,33,35,38,40,41], and 4 (28.6%) found the apps easy to use [35,38,40,41]. One (7.1%) study suggested that mobile apps could serve as a public health tool to enhance patients’ quality of life [32].

Some studies also provided user feedback or detailed how the mobile apps were used. For instance, Chen et al [31] noted that the most frequently visited screens were those related to health recommendations, daily monitoring of health indicators, health behaviors, and medication adherence. Chew et al [38] found that features such as reminder functions, medication summary, and multiuser support were particularly helpful, though users faced challenges when adding new medications and suggested more in-app guidance. Huang et al [40] observed that while the app was useful for older users, they found reminder notifications somewhat annoying. Finally, Pang et al [41] reported that users appreciated features such as medication reminders, a color-coded calendar, and a reward system, though there were privacy concerns about features that might inadvertently disclose users’ HIV status.

This narrative review identified 14 mobile apps used to enhance medication adherence within the Asian context. The findings illustrate the varied features of existing mobile apps used to address medication adherence, aiming for improved health outcomes. Consistent with previous research on enhancing medication adherence, integrating a variety of reminder, behavioral, and educational strategies into intervention content has potential to enhance adherence behavior more efficiently and effectively [9].

Using reminder strategies is a key tactic to help patients adhere to their medication schedules, often implemented through alarms, push notifications, or short message services [19]. To ensure correct medication use, patients need to input or log their medication information into apps, such as the name, dosage, and frequency of their medications. This process requires a level of proficiency in using digital devices. Patients may benefit from user-friendly interfaces or additional assistance from family members or health care professionals to navigate these apps effectively. Furthermore, some apps remind patients of regular follow-up appointments and disease monitoring, providing additional cues to reinforce patient self-efficacy and mitigate forgetfulness, which is one of the most commonly reported reasons for nonadherence to chronic disease medications [4,43]. Therefore, integrating reminder functions for medication-taking with other aspects of disease management may result in improved medication adherence [34,41].

Behavior-focused strategies, such as prompts, social support, and rewards, are effective in encouraging patients to adopt new medication practices [9]. A higher proportion of feedback and web-based consultation features were observed in the mobile apps reviewed in this study. In contrast, many medication adherence apps available on the Apple App Store or Google Play Store lack such functions [10,28]. This divergence may stem from the fact that the apps in our review were mostly developed by research teams for study purposes. This enabled them to integrate more health care professional support for feedback and web-based consultation features. However, most mobile apps available to patients on their personal smartphones are patient-focused and not accessible by pharmacists or physicians [10]. Integrating chatbot functionality to facilitate mutual conversation between patients and health care professionals to address patient concerns requires costly infrastructure, making it more common in research settings than for commercial purposes. Further research is needed to confirm the effectiveness of these features.

In addition, several motivation systems were identified in the apps to motivate patients to adhere to medication regimens. Two apps provided messages about praise and encouragement for patients with good adherence [33,37], while 5 apps used gamification or financial incentives as motivation strategies [31,35,38,41,42]. Patients would receive rewards such as digital coins, scenic photos, or local currency upon confirming their medication adherence. Consistent with previous studies, our review indicated that reward and gamification-based medication adherence features could effectively improve or maintain optimal medication adherence [44,45]. However, the precise correlation and ceiling effect of the incentive value and its impact on medication adherence required further investigation.

Socialization features are valuable for patients as they offer social support from family, friends, peers, and health care professionals [46]. Patient community forums create comfort space for patients with similar backgrounds to share their experiences of tackling medications, enabling immediate consultation with health care professionals or fellow patients in case of any medication-related concerns [47]. Among the apps reviewed, only the iCARE included such a feature. Moving forward, the development of medication adherence apps may consider incorporating such a socialization feature [47].

Apart from medication intake, disease management relies on dietary adjustments and lifestyle modifications [5]. The educational strategies used by the selected apps encompassed various aspects, including disease background, medication introduction, diet guidance, and exercise recommendations. While it is recognized that simply providing knowledge may not always lead to behavior change, offering basic information can assist patients in navigating their health care journey, preventing the consolidation of misinformation. This is particularly beneficial for individuals facing barriers to accessing credible information for medication use and disease management.

A team-based health care approach facilitates collaboration among patients, caregivers, and providers, enhancing health care satisfaction and patient outcomes [30,31]. Implementing the multiple user support function enables caregivers, such as family members, to remotely monitor patients’ medication adherence and health status, taking appropriate actions when necessary [37]. However, in our review, only 3 mobile apps included such functionality [31,33,36], grouping patients, caregivers, and health care professionals as target users to enhance medication adherence. Other apps primarily focused on delivering information to patients themselves [32,35] or facilitating communication between patients and their health care providers [29,30,34,37,41,42], overlooking the role of caregivers. Caregivers play a crucial role in supporting patients with chronic diseases and have been shown to enhance patients’ medication adherence and treatment outcomes [40]. Participants in the study by Chew et al [37] also expressed high satisfaction with the multiple user support function of the Med Assist, particularly as it is common for working adults to care for older parents in the Asian community, making multiple-user support a convenient and effective method. In summary, the inclusion of multiple user support functionality may be considered an important feature in future mobile app development, provided privacy concerns are addressed.

Privacy and confidentiality concerns can significantly impact the acceptability of mobile apps [41]. Given that these apps often store sensitive data, such as personal identification information, ensuring system security and protecting user privacy is crucial [39]. Measures such as user authentication, encryption for data transmission and storage, and strong password protection are essential for safeguarding privacy [30,31,34,39,40]. In addition, app features should be carefully designed to prevent unintended disclosure of users’ medical conditions. For instance, while the MIST app requires patients to record and report videos of their medication intake, some users worry that this could inadvertently reveal their HIV status, as it might attract unwanted attention from others [41]. Although this feature may improve medication adherence, it also raises concerns about privacy. Currently, there are no unified regulations or guidelines for privacy protection in mobile health apps, making it important for future developments to prioritize privacy safeguards to maintain user trust and protect sensitive information [36].

None of the selected apps were developed by the government, potentially limiting their use in connecting patient health information across institutions. In some Asian countries with single-payer public health insurance, integrating patient data through a single-payer health care system is more feasible than dealing with data fragmentation from a multipayer health care system [48]. The majority of the mobile apps reviewed were developed by research teams, while others were developed by commercial companies or hospitals. None of the selected apps were able to synch to other adherence devices. Consequently, patient health information recorded in these mobile apps may only be accessible to a few health care networks collaborating with the app developers and may not be easily assessed or updated within other health care systems without special requests or permissions. Incorporating patient-generated health data, which includes clinically relevant information captured by patients outside of conventional health care settings, into electronic health records is essential. This integration is critical because leveraging patient-generated health data in clinical practice has the potential to fill health care gaps and enhance personalized treatment [49]. Furthermore, integrating health services into a single reliable and personalized platform could streamline the health care journey, potentially incentivizing patients to adhere to using a single app [40]. While consolidating patient information from various sources into 1 platform can simplify health care processes, developers need to prioritize data security and personal confidentiality. This is essential to prevent users from avoiding or uninstalling an app due to concerns about privacy breaches [12].

Although the mobile apps reviewed in this study come from various Asian countries with differing design features and cultural contexts, we found consistently high user satisfaction and perceived usefulness [31,33,35,37,38,40,41]. Most studies also reported that these apps positively impacted clinical outcomes and medication adherence [29,33-37,40,42]. These results align with previous research conducted in western populations [10,50-52], indicating that mobile app interventions for patients with chronic diseases are both feasible and well-received in the Asian population as well.

Overall, the selected mobile apps consist of a broad spectrum of components to address medication adherence. While these apps offer diverse features for improving medication adherence, it is important to note that the quality and effectiveness of an app cannot be solely determined by the number of features it provides. Without valid studies, it remains unclear which apps are most suitable for use. Recent evidence suggests a shift in the trend toward the use of digital devices as interest in mHealth grows [53]. Therefore, developers should consider users’ needs, their proficiency with digital devices, and the resources available to them when designing apps to promote medication adherence.

This study has several limitations. First, the apps selected were obtained from peer-reviewed journals and not from commercial platforms such as the Apple App Store and Google Play Store. Therefore, the included mobile apps may not represent all available options, particularly those not published in academic databases. It is worth noting that paid commercial apps may offer additional features and functionality, and testing such apps could have provided further insights into strategies used to promote medication adherence. Second, we only included articles available in English, potentially overlooking effective apps in other languages. Third, our search was limited to articles published until August 2024, and given the rapid production and release of new apps, we acknowledge that new adherence apps may have been released after our review.

This review has highlighted key components integrated into mobile apps for medication adherence. Nevertheless, the lack of government and corporate engagement during development impedes the generalizability of any single app. In addition, beyond basic reminder functions, features such as multiple user support, feedback mechanisms, web-based consultation, motivational tools, and socialization features show promising potential in improving medication adherence. Further pragmatic research is essential to confirm the efficacy of these selected apps in enhancing medication adherence.

The study materials and detailed analyses are available from the corresponding author upon reasonable request.