Side Effects of Yaz Birth Control for PCOS Patients - Obstetrics and Gynecology

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Yaz contraceptive pill


Hello, I started taking Yaz birth control pills on the first day of my menstrual period (February 3rd), and today (February 11th) my menstruation is still relatively heavy with dark-colored blood.
Is this situation related to my body still adjusting to the medication? (I have polycystic ovary syndrome).
Thank you.

Wu, 20~29 year old female. Ask Date: 2010/02/11

Dr. Dong Yuhong reply Obstetrics and Gynecology


Hello: You have been taking the Yaz contraceptive pill since February 3rd, and you are still experiencing heavier menstrual bleeding as of February 11th.
It is advisable to consult a gynecologist.
The physician will explain your current issues based on your examination findings and discuss potential treatment options for improvement.
It is recommended to seek medical attention, cooperate with your physician's examinations and treatments, and choose a suitable treatment method for polycystic ovary syndrome (PCOS) as well as the most appropriate type of contraceptive pill for you.
Thank you.

Reply Date: 2010/02/11

More Info


When starting Yaz (drospirenone and ethinyl estradiol), especially for patients with polycystic ovary syndrome (PCOS), it is common to experience various side effects as your body adjusts to the hormonal changes. The fact that you began taking Yaz on the first day of your menstrual period is a standard practice, as it helps to ensure immediate contraceptive effectiveness.

1. Menstrual Changes: It is not unusual to experience changes in your menstrual cycle when you start taking Yaz. This can include variations in flow, color, and consistency of menstrual blood. Darker blood can indicate older blood that has taken longer to exit the uterus, which is often seen in the early stages of hormonal contraceptive use. Your body may take some time to adjust to the new hormone levels, especially if you have a history of irregular cycles due to PCOS.

2. Adaptation Period: The initial months of taking Yaz can involve side effects such as spotting, changes in menstrual flow, breast tenderness, and mood swings. These symptoms typically improve after the first few cycles as your body becomes accustomed to the medication. It is essential to monitor these symptoms and discuss them with your healthcare provider if they persist or worsen.

3. PCOS Considerations: For women with PCOS, hormonal contraceptives like Yaz can help regulate menstrual cycles and reduce symptoms associated with the condition, such as excessive hair growth and acne. However, the adjustment phase may be more pronounced due to the underlying hormonal imbalance associated with PCOS.
4. When to Seek Medical Attention: If you experience severe side effects, such as heavy bleeding, severe abdominal pain, or signs of a blood clot (like swelling or pain in the legs, sudden shortness of breath, or chest pain), you should seek medical attention immediately. It’s also advisable to consult your healthcare provider if you have concerns about the duration or nature of your bleeding.

5. Self-Care and Monitoring: Keeping a diary of your symptoms, menstrual cycle, and any side effects can be beneficial. This information can help your healthcare provider make informed decisions about your treatment. Staying hydrated, maintaining a balanced diet, and engaging in regular physical activity can also support your overall well-being during this adjustment period.

6. Long-Term Outlook: Many women find that their menstrual cycles become more regular and manageable after several months of consistent use of Yaz. If you find that your symptoms do not improve or if you have concerns about the medication, it is crucial to have an open dialogue with your healthcare provider. They may consider adjusting your dosage or trying a different contraceptive method that may be better suited for your needs.

In summary, the changes you are experiencing are likely part of your body’s adjustment to Yaz, particularly given your history of PCOS. While it can be concerning to see darker blood or changes in flow, these are often temporary. However, maintaining communication with your healthcare provider is key to ensuring that you receive the best care tailored to your specific situation.

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