Thanks for your query.
or adjustment of dose of medicine can turn out to be harmful.
Also keep in mind that never stop the blood pressure medicines without doctors advice.
Presently you are doing yoga
and want to exercise both these are good and healthy lifestyle changes.
Along with this you should completely stop alcohol intake and cut down on fatty fried food.
Follow up with your doctor and get examined and if he feels the dose can be reduced he will advise you accordingly.