Epidemiological and clinical aspects of migraine in users of combined oral contraceptives.

BACKGROUND

Migraine was assessed in users of combined oral contraceptives (COCs).

STUDY DESIGN

This study had a cross-sectional design. Women with headaches were evaluated according to International Headache Society criteria and subsequently allocated to a "migraine" or "non-migraine" group.

RESULTS

Migraine was detected in 80/480 women (16.6%), while other types of headache not classified as migraine were observed in 400 women (83.4%). Following COC use, headaches worsened in 32.5% and 19.3% [odds ratio (OR)=3.02; 95% confidence interval (CI)=1.68-5.4] and improved in 30% and 13.8% (OR=3.9; 95% CI=2.12-7.18) of the "migraine" and "non-migraine" groups, respectively. In the migraine group only, headache episodes occurred predominantly during or around the hormone-free interval (OR=2.05; 95% CI=1.26-3.35). The combination of ethinylestradiol (EE) and drospirenone (DRS) was significantly associated with an improvement in the frequency and/or intensity of migraine-type headaches, compared with other types of COCs.

CONCLUSIONS

The prevalence of migraine in COC users appears similar to that found in the general population. Migraines, but not other types of headache, were significantly affected by COCs. The EE/DRS combination was associated with a greater likelihood of improvement in migraine compared with other types of COCs.