Low-Ogestrel is a combination birth control pill containing two synthetic hormones: 0.3 mg of norgestrel (a progestin) and 0.03 mg of ethinyl estradiol (an estrogen). It’s taken daily to prevent pregnancy and comes in a standard 28-day pack with 21 active hormone tablets and 7 inactive pills. You may also see it sold under the brand names Cryselle, Elinest, and Turqoz, which contain the same formulation.
How Low-Ogestrel Prevents Pregnancy
Like other combination birth control pills, Low-Ogestrel works through three overlapping mechanisms. The hormones suppress ovulation, so your ovaries don’t release an egg each month. They also thicken cervical mucus, making it harder for sperm to reach an egg, and thin the uterine lining, which reduces the likelihood of implantation.
With perfect use (taking the pill at the same time every day without missing any), combination pills like Low-Ogestrel have a failure rate of just 0.3% in the first year. In typical real-world use, where missed pills and timing inconsistencies are common, that failure rate rises to about 9%.
How to Take It
You take one white active pill daily for 21 days, then one inactive pill daily for 7 days. Your period typically arrives during the inactive pill week. Starting a new pack on schedule is what keeps you protected.
If you miss a pill by less than 48 hours, take it as soon as you remember, even if that means taking two pills in one day. No backup protection is needed. If you miss two or more pills in a row (48 hours or more since your last scheduled pill), take the most recent missed pill right away, discard the others you missed, and use condoms or abstain for the next 7 days while you continue the pack. If those missed pills fall in the last week of active pills, skip the inactive pills entirely and start a new pack immediately to maintain hormone coverage.
Common Side Effects
The side effects of Low-Ogestrel are typical of combination birth control pills. Many people experience nausea, breast tenderness, headaches, spotting between periods, or mood changes in the first few months. These often improve as your body adjusts to the hormones. Weight changes, bloating, and changes in sex drive are also reported. Most side effects are mild and tend to settle within two to three cycles.
Serious Risks and Who Should Avoid It
Low-Ogestrel carries an FDA boxed warning about smoking. If you smoke and are over 35, this pill is not an option for you. Smoking combined with combination birth control significantly raises the risk of heart attack, stroke, and blood clots, and the risk climbs with the number of cigarettes smoked per day. Studies have found that 15 or more cigarettes daily is associated with a particularly sharp increase in cardiovascular risk.
For all users, combination pills slightly increase the chance of blood clots in the legs or lungs. The risk is estimated at 3 to 9 cases per 10,000 women per year, which is low in absolute terms but higher than the baseline risk for women not taking hormonal birth control. The risk of heart attack for current users has been estimated at 2 to 6 times that of non-users, though this is most relevant for women who smoke or have conditions like high blood pressure, high cholesterol, obesity, or diabetes.
Low-Ogestrel is also contraindicated if you have a history of blood clots, stroke, or coronary artery disease, certain types of heart valve disease, uncontrolled high blood pressure, diabetes with vascular complications, active liver disease, known or suspected breast cancer, undiagnosed abnormal vaginal bleeding, or migraine headaches with visual or neurological symptoms. If you’re planning a major surgery that requires extended bed rest, you may need to stop taking it temporarily.
Medications That Can Reduce Effectiveness
Certain medications speed up how your liver processes the hormones in Low-Ogestrel, which can lower the amount circulating in your body and reduce its effectiveness. The most commonly flagged categories include some seizure medications, certain antibiotics (particularly rifampin), some HIV medications, and the herbal supplement St. John’s wort. If you’re prescribed a new medication while on Low-Ogestrel, it’s worth confirming whether it interacts with hormonal birth control, since backup contraception may be needed during treatment.
How It Compares to Other Pills
Low-Ogestrel is considered a “low-dose” pill because it contains 0.03 mg of ethinyl estradiol, which is on the lower end of estrogen content among combination pills. A related formulation, Ogestrel 0.5/50, contains a higher dose of both hormones (0.5 mg norgestrel and 0.05 mg ethinyl estradiol). Lower estrogen doses are generally associated with fewer estrogen-related side effects like bloating and breast tenderness, while still providing reliable pregnancy prevention. The progestin in Low-Ogestrel, norgestrel, is an older-generation progestin that has been used in oral contraceptives for decades.