不推荐用PILLS。 有些人用会出现SIDE EFFECTS，小的如头痛，大的如血管改变。曾有病例因服用BIRTH CONTROL PILL而导致眼底病变，致视力下降，视野缩窄，视神经萎缩。

我这方面研究不多，只能说我知道的，都是实例，并非耸人听闻。Of course, I think the probability that a woman has some side effects due to taking birth control pills is low, otherwise those drug won't be approved by the FDA. If you search on medline, you should be able to find some articles published on medical journals focusing on this issume. As to what is the best way for birth control, I don't know.