Blood pressure (BP) and body weight were assessed at entry, 6 months and 12 months of use in a prospective study of 117 and 76 women using low-dose oral contraceptives (LD-OCs) and Norplant, respectively. The results showed that mean systolic BP (mmHg), diastolic BP (mmHg) and weight (kg) for LD-OCs and Norplant at entry, 6 months and 12 months, respectively, were not significantly different. During the one year of use, the study found that moderate increase in BP occurred at the same frequency as reduced BP, and that observed variation in BP was within a narrower range in Norplant users compared with LD-OC users.