Renin is an enzyme produced by the kidneys that helps control blood
pressure. Renin works by activating other chemicals to narrow (constrict) blood vessels,
which increases blood pressure; a decrease in renin levels helps lower blood
Normally, this mechanism keeps blood pressure within a healthy
range. But some people develop chronic high blood pressure (hypertension).
When this occurs, medicines may be used that block the action of renin on
How this information was developed to help you make better health decisions.