This study identied factors that contributed to the effectiveness of antihypertensive drugs and investigated the
most effective antihypertensive drug in controlling blood pressure. The purposive sampling technique was
used in this quasi-experimental design to enroll study participants. Of the 120 hypertensive patients following
consultations at a district hospital of Oluvil, only 100 complied with the experiment. Following medical checkup,
it was investigated that hypertension were controlled within 3 months affected by age, and gender. Gender,
more probable were women, was primarily identied as a factor (p=0.002657); and age bracket of 30-40 years
old was also identied as a factor to had helped control blood pressure (p=0.002107). Hypertensive drugs such
as Calcium Channel Blockers (p=0.0008712), Angiotensin Receptor Antagonist (p=0.03983), and
Angiotensin Converting Enzymes Inhibitors (p=0.04719) at normal dosages controlled blood pressures
among Sri Lankan hypertensive patients.