Switching Birth Control: From Aiji to Aiwei - What You Need to Know - Obstetrics and Gynecology

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I was originally taking Aikii 21 regularly, but today I could only find Aivee 24+4 at the time to take my medication.
Can I finish the 28 pills of Aivee and then directly switch back to Aikii, regardless of whether my period has come or not? Thank you.

Ting, 20~29 year old female. Ask Date: 2022/12/10

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, contraceptive pills are typically started on the fifth day of your menstrual period.
Wishing you good health!

Reply Date: 2022/12/10

More Info


When switching birth control methods, particularly from one oral contraceptive to another, it is essential to understand how to do so safely and effectively to maintain contraceptive efficacy and minimize side effects. In your case, you are transitioning from Aiji (a 21-day pill) to Aiwei (a 24+4 pill). Here’s what you need to know:
1. Understanding the Pills: Aiji is a 21-day birth control pill, meaning you take it for 21 days and then have a 7-day break during which you typically have your period. Aiwei, on the other hand, is a 24+4 pill, which means you take it for 24 days followed by 4 days of placebo pills. The placebo pills are designed to allow for a withdrawal bleed, similar to a period.

2. Transitioning Between Pills: When switching from Aiji to Aiwei, you can generally do so without a break. Since you are currently at the end of your Aiji pack, you can start taking Aiwei immediately after finishing the Aiji pills. This means you would take the remaining pills from Aiwei without waiting for your period to start.
3. No Gap in Coverage: By transitioning directly from Aiji to Aiwei, you maintain continuous contraceptive coverage. This is important because any gap in taking the pills can increase the risk of unintended pregnancy.
4. Monitoring Your Body: After switching, it’s important to monitor how your body responds to the new pill. Some women may experience changes in their menstrual cycle, mood, or other side effects when switching birth control methods. If you notice any concerning symptoms or significant changes, it’s advisable to consult your healthcare provider.

5. Consulting Your Healthcare Provider: While the general guidance is to switch directly, individual health circumstances can vary. It’s always best to discuss any changes in your birth control regimen with your healthcare provider. They can provide personalized advice based on your health history and any other medications you may be taking.

6. Potential Side Effects: Both Aiji and Aiwei may have different side effects due to their hormonal compositions. Be aware of potential side effects such as nausea, headaches, or changes in your menstrual cycle. If you experience severe side effects or symptoms that concern you, seek medical advice promptly.

7. Effectiveness: Both types of pills are designed to be effective when taken correctly. If you take Aiwei as directed, you should maintain the same level of contraceptive protection as you had with Aiji.

8. Follow-Up: After a few months on Aiwei, consider scheduling a follow-up appointment with your healthcare provider to discuss how you are feeling on the new pill and whether it is the right choice for you.

In summary, you can switch from Aiji to Aiwei without a break in between, ensuring you continue to have contraceptive protection. Just be sure to monitor your body’s response and consult with your healthcare provider for personalized guidance.

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