Sprintec is a combination birth control pill prescribed to prevent pregnancy. Each active tablet contains two synthetic hormones: a progestin (norgestimate, 0.250 mg) and an estrogen (ethinyl estradiol, 0.035 mg). It comes in a 28-day pack with 21 hormonally active blue pills and 7 inactive white pills taken during your period week.
How Sprintec Prevents Pregnancy
Sprintec works through three overlapping mechanisms. The primary one is stopping ovulation. The hormones in each pill suppress the signals your brain sends to your ovaries, so an egg is never released. Without an egg, pregnancy can’t happen.
The two backup mechanisms kick in if something goes slightly wrong with ovulation suppression (a late pill, for example). First, the hormones thicken your cervical mucus, making it harder for sperm to reach an egg. Second, they thin the uterine lining, making it less receptive to a fertilized egg. All three mechanisms work together, which is why combination pills remain one of the most reliable reversible contraceptive methods available.
How Effective It Is
With perfect use, meaning you take your pill at roughly the same time every day and never miss one, the failure rate is about 0.3% in the first year. That means fewer than 1 in 300 people would get pregnant. With typical use, which accounts for missed pills and late doses, the failure rate rises to about 9%. That gap between perfect and typical use is the biggest practical consideration with any daily pill, and it’s why consistency matters so much.
Other Reasons It May Be Prescribed
Sprintec’s only FDA-approved use is pregnancy prevention. That said, the same hormonal combination is commonly prescribed off-label for hormonal acne, painful or heavy periods, endometriosis symptoms, and polycystic ovary syndrome (PCOS). A closely related formulation (sold under a different brand name with the same active ingredients) does carry formal FDA approval for moderate acne in people who also want contraception. Your provider may prescribe Sprintec for these purposes based on the shared pharmacology.
Common Side Effects
In clinical trials involving over 1,600 women, the most frequently reported side effects were headaches or migraines (about 33%), vaginal infections (8.4%), abdominal or stomach pain (7.8%), genital discharge (6.8%), breast tenderness or pain (6.3%), and mood changes including depression (5%). Less common but still notable were bloating (3.2%), nervousness (2.9%), and skin rash (2.6%).
Between 11% and 21% of trial participants stopped taking the pill because of side effects. The top reasons for quitting were irregular bleeding, nausea or vomiting, headaches, and mood changes. Most side effects are most noticeable in the first two to three months and often improve as your body adjusts.
Blood Clot Risk
All combination birth control pills carry a small increased risk of blood clots, particularly in the legs (deep vein thrombosis) or lungs (pulmonary embolism). For people not using hormonal birth control, the background rate is roughly 2 clots per 10,000 women per year. For those taking a pill containing a second-generation progestin like levonorgestrel, the rate rises to about 8 per 10,000. Norgestimate, the progestin in Sprintec, behaves similarly to levonorgestrel in the body, and studies have found its clot risk falls in that same range rather than the higher range seen with some newer progestins.
The risk is still low in absolute terms, but it climbs significantly if you smoke. People over 35 who smoke should not use Sprintec or any combination oral contraceptive because of a sharply elevated risk of heart attack, stroke, and blood clots.
Who Should Not Take Sprintec
Beyond smokers over 35, Sprintec is not appropriate for people with a current or past history of blood clots, stroke, or coronary artery disease. Other conditions that rule it out include uncontrolled high blood pressure (at or above 160/100), diabetes that has affected your blood vessels, migraines with aura, certain heart valve conditions, liver disease or liver tumors, known or suspected breast cancer, and unexplained vaginal bleeding. You also should not take it if you are or might be pregnant.
Medications That Reduce Effectiveness
Certain drugs speed up the way your liver processes hormones, which can lower the amount of active hormone in your bloodstream enough to reduce contraceptive protection. The most well-known culprit is rifampin, an antibiotic used for tuberculosis. Several seizure medications also fall into this category, including phenytoin, carbamazepine, topiramate, and oxcarbazepine. St. John’s wort, an herbal supplement used for mood support, has the same effect. Some HIV and hepatitis C medications can also interfere. If you take any of these, your provider may recommend a different contraceptive method or an additional backup like condoms.
What to Do If You Miss a Pill
If you’re less than 24 hours late, take the pill as soon as you remember and continue with your pack as normal. No backup contraception is needed.
If you’ve missed one pill by 24 to 48 hours, the guidance is the same: take it as soon as possible, even if that means taking two pills in one day. You still don’t need backup protection in most cases.
If you’ve missed two or more pills in a row (48 hours or more since your last scheduled dose), the protocol changes. Take only the most recent missed pill and discard any others you skipped. Continue taking one pill a day as usual. You’ll need to use condoms or avoid sex for the next seven days while the hormones rebuild in your system. If the missed pills fell in the last week of active pills in your pack, skip the placebo week entirely and start a new pack right away. If you had unprotected sex during the first week of your pack and missed pills, consider emergency contraception.
How Sprintec Compares to Similar Pills
Sprintec is a monophasic pill, meaning every active tablet contains the same dose of hormones. Its close relative, Tri-Sprintec, is triphasic, delivering three different hormone levels across the cycle. Both contain norgestimate and ethinyl estradiol. The monophasic design of Sprintec can make it slightly simpler to manage if you need to skip or rearrange pills, since every active pill is identical. In terms of effectiveness and safety, the two are comparable. Sprintec is also a generic equivalent of Ortho-Cyclen, so if you’ve seen that name before, you’re looking at the same formulation at a lower cost.