Drug adherence refers to whether patients accept their meds as recommended, and whether they keep on taking an endorsed prescription. Drug nonadherence is a developing worry to clinicians, human services frameworks, and different partners on account of mounting proof that it is common and related with unfavorable results and higher expenses of consideration. To date, estimation of patient drug adherence and utilization of mediations to enhance adherence are uncommon in routine clinical practice. The objectives of the present report are to address distinctive strategies for estimating adherence, the pervasiveness of prescription nonadherence, the relationship among nonadherence and results, the purposes behind nonadherence, lastly, intercessions to enhance medicine adherence. Pharmacoepidemiology Researches invites an article to publish in the Journal of Pharmacovigilance and Pharmacoepidemiology. Pharmacovigilance and Pharmacoepidemiology is a scholarly journal maintaining high standards of Pharmacoepidemiology Researches. This Journal runs with scientific excellence and propagates the peer review process very quickly.