the Contraceptive Effects of Xin Na Tablets in Gynecology - Obstetrics and Gynecology

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Medication Confusion


Hello, according to Dr.
Tsao's response, the medication Xinna tablets provides contraceptive effects at any time when taken as directed.
However, I also inquired with Synmosa Customer Service, and they stated that for example, if a woman's menstrual cycle is 28 days and her period starts on September 2, her next period would be on September 30 (September 2 plus 28 days).
If we subtract 14 days from September 30, then September 16 would be the ovulation day.
Engaging in sexual intercourse 5 days before and 4 days after September 16 (from September 11 to 20) would present a chance of pregnancy.
So, does this mean that this medication cannot suppress ovulation and only regulates the menstrual cycle, allowing ovulation to occur according to the normal menstrual cycle?

A Xiao, 20~29 year old female. Ask Date: 2020/08/19

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, I apologize for the mistake.
This medication is usually used for regulating menstruation and is not very effective for contraception, so it is best to use additional contraceptive measures.
Wishing you good health.

Reply Date: 2020/08/19

More Info


The question regarding the contraceptive effects of Synna tablets is an important one, especially for women who are considering their reproductive health options. Synna tablets contain a combination of estradiol and medroxyprogesterone, which are hormones that can influence the menstrual cycle and ovulation.

To clarify, Synna tablets are primarily used for managing symptoms related to hormonal imbalances, such as those experienced during menstruation or menopause. They can also serve as a form of hormonal contraception. When taken correctly, these tablets can effectively prevent ovulation, thereby reducing the chances of pregnancy. However, the effectiveness of any contraceptive method, including hormonal contraceptives like Synna, can depend on several factors, including adherence to the prescribed regimen and individual physiological responses.

The information provided by the customer service representative indicates that there is a specific window during which a woman is most fertile, typically around the time of ovulation. For a woman with a regular 28-day cycle, ovulation usually occurs about 14 days before the next menstrual period. This means that if a woman has unprotected intercourse during the fertile window (approximately five days before and four days after ovulation), there is a higher chance of conception.

However, the primary function of Synna tablets, when taken as directed, is to suppress ovulation. This means that if the medication is taken consistently and correctly, it should prevent ovulation from occurring. Therefore, while the natural menstrual cycle and ovulation can still be calculated based on a woman's cycle, the use of Synna tablets alters this process by providing exogenous hormones that inhibit the body's natural hormonal fluctuations.

It's also important to note that while Synna can be effective in preventing pregnancy, no contraceptive method is 100% effective. Factors such as missed doses, gastrointestinal disturbances (like vomiting or diarrhea), and interactions with other medications can reduce the effectiveness of hormonal contraceptives. Therefore, it is crucial for women using Synna to follow their healthcare provider's instructions closely and to discuss any concerns or side effects they may experience.

In summary, Synna tablets can indeed provide contraceptive effects by suppressing ovulation. However, understanding the timing of ovulation and the fertile window is essential for women who are considering their options for pregnancy. If there are any uncertainties or specific concerns regarding the use of Synna tablets, it is advisable to consult with a healthcare provider who can provide personalized guidance based on individual health needs and circumstances.

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