There has been a growing prevalence of hypertension and its associated diseases. Medication adherence is one of the primary factors of uncontrolled blood pressure in patients and non-adherence to medication can result in morbidity and mortality for the patient and increased financial strain on the healthcare system. With the wide availability of mobile phones, using short messaging system (SMS) reminders as an intervention has shown promising results in improving medication adherence. The present study aims to see if SMS reminders can help improve medication adherence among hypertensive patients seen in the out-patient department.

To determine the effect of short messaging system reminders on the medication adherence among hypertensive patients seen in the outpatient department of Cebu South Medical Center (CSMC) in a 12-week trial period.

This was a two-arm parallel group, double blind, randomized clinical trial using short text messaging reminder to hypertensive patients conducted last October 4, 2023 to December 27, 2023 at CSMC Outpatient Clinic under Family Medicine Service. A two-part questionnaire composed of baseline clinical variables and the Hill-bone Medication Adherence Scale (HBMAS) (Kim, et al 2000) was utilized pre- and post-intervention. STATA Software was used to analyze the date with intention to treat analysis. Descriptive statistics was computed for dichotomous variables while continuous variables were expressed as means and measured before and after intervention. The mean HB-MAS scores pre intervention and post-intervention per group were compared using the Wilcoxon signed rank test, while scores between intervention and control groups pre- and post-intervention were analyzed using the Wilcoxon rank-sum test with 95% confidence intervals (CIs), with two-sided p values reported and statistical significance set up at p < 0.05.

A total of 102 patients were enrolled in the study (51 in intervention group and 51 in control group) with no dropouts. There was no significant difference between the baseline and post intervention medication adherence scores in both the intervention and control groups, however, there was a significant difference of the scores between the intervention and control groups post intervention (p = 0.001). There was also noted improvement of the blood pressure among participants in the intervention group, with lower blood pressures post-intervention on average (120/80 mmHg) compared to baseline (130/90 mmHg), while participants in the control group still exhibited high blood pressure (130/90 mmHg) post-intervention.

Given the widespread availability of mobile devices and the increased awareness generated by social media, it may be easier to put interventions in place that improve drug adherence. Through the use of easily accessible technology, this study helps patients remember to take their prescription by offering straightforward reminders that can help them overcome these obstacles to medication adherence.