All the following are the beneficial effects of oral contraceptive pills, EXCEPT:
Estrogen causes increased hepatic synthesis of a variety of globulins. Increase in angiotensinogen production which seems to be dose related and its conversion by renin to angiotensin is suspected to be associated with 'pill induced hypeension'. So OCPs causes hypeension not decreased BP. Ref: Williams Gynecology, Page 249, Table 5-6
Decreased risk of ectopics
Prevention of atherogenesis
Decreased BP
Increase in bone density