Welcome to HCM
You are having High BP
for which Lisinopril
is very good drug, usually this doesnot cause cycle abnormalities .
A word of caution if you are in age group where pregnancy
is possible definately this is not safe in pregnancy,so if you are planning pregnancy please see your Physician to change your blood pressure medicine,
There may be many other causes for cycle abnormality.
Kindly get yourself examined by Gynecologist and if required proper investigations to know cause.