Poor medication adherence is a global problem that compromises the benefit of a given treatment. 1 It also increases the rate of mortality, morbidity and healthcare costs. 2 In the United States, direct medical cost of chronic diseases reached a trillion dollar, while nonadherence costs over $170 billion annually. 2,3 Furthermore, in transplant recipients, the non-adherence to immunosuppressants results in 1319 cases of renal transplant failure annually. 4 The achievement of the total benefit from medication is determined by patient adherence to their treatment regimens. 5 Adherence is defined as the "extent to which a patient acts in accordance with the prescribed interval and dose and dosing regimen". 6 Half of the prescribed medications for chronic diseases are not taken as prescribed by their healthcare providers. 2 Hypertension is one of the chronic medical conditions that affects a great percentage of people all over the globe. In 2000, the estimated number of adults with hypertension was 972 million and