Bleeding between periods (spotting) is a common side effect of Sprintec®
(norgestimate/ethinyl estradiol). In most cases, this is not a serious side effect and does not require medical attention.
However, certain side effects of Sprintec are potentially serious and should be reported to your healthcare provider right away. Notify your healthcare provider if you experience heavy vaginal bleeding or unusual vaginal bleeding that does not improve within a few months of starting Sprintec.
(To learn more about the side effects of this oral contraceptive, click Sprintec Side Effects. This article also explains why it is not possible to use a placebo in clinical studies of oral contraceptives.)