药理作用
本品为速效、短效避孕药，避孕机制是显著抑制排卵和阻止孕卵着床，并使宫颈黏液稠度增加，精子穿透阻力增大，从而发挥速效避孕作用。

适应症
用于女性紧急避孕，即在无防护措施或其他避孕方法偶然失误时使用。

用法用量
口服，在房事后72小时内服第1片。
如果您有任何疑问，请遵医嘱。

不良反应
偶有轻度恶心、呕吐，一般不需处理、可自行消失，如症状较重应向医帅咨询。

注意事项
1.本品是用于避孕失误的紧急补救避孕药，不是引产药。
2.本品不宜作为常规避孕药，服药后至下次月经前应采取可靠的避孕措施。
3.如服药后2小时内发生呕吐反应，应立即补服1片。
4.本品可能使下次月经提前或延期，如逾期1周月经仍未来潮，应立即到医院检查，以排除妊娠。
5.对本品过敏者禁用。
6.乳腺癌、生殖器官癌，肝功能异常或近期有肝病或黄疸史。静脉血栓病，脑血管意外、高血压、心血管病、糖尿病，高脂血症、精神抑郁患者以及40岁以上妇女禁用。
7.本品性状发生改变时禁止使用。
8.请将此药品放在儿童不能接触的地方。

药物相互作用
如正在使用其他药品，尤其是苯巴比妥。苯妥英钠、利福平、卡马西平。大环内酯类抗生素，咪唑类抗真菌药。西咪替丁以及抗病毒药等，使用本品前请咨询，医师或药师。

贮藏条件
避光，密封保存

【原产地英文商品名】NEXT CHOICE 0.75mg/tab 2tabs/Packet 3Packets/box
【原产地英文药品名】LEVONORGESTREL
【中文参考商品译名】NEXT CHOICE 0.75毫克/片 2片/包 3包/盒
【中文参考药品译名】左炔诺孕酮

Plan B
Generic Name: levonorgestrel emergency contraceptive (LEE voe nor jes trel)
Brand Names: Next Choice, Plan B

What is Plan B?
Levonorgestrel is a female hormone that prevents ovulation (the release of an egg from an ovary). Plan B also causes changes in your cervical mucus and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus.

Plan B is used to prevent pregnancy after unprotected sex or failure of other forms of birth control (such as condom breakage, or missing 2 or more birth control pills).

Plan B may also be used for other purposes not listed in this medication guide.

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Important information about Plan B
Do not use Plan B if you are already pregnant. Plan B will not terminate a pregnancy that has already begun (the fertilized egg has attached to the uterus). Plan B is not intended for use as a routine form of birth control and should not be used in this manner. Talk with your doctor about the many forms of birth control available. Do not give Plan B to anyone younger than 17 years old. Contact a doctor for medical advice.

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Before taking Plan B
Plan B is not intended for use as a routine form of birth control and should not be used in this manner. Talk with your doctor about the many forms of birth control available. Do not use Plan B if you are already pregnant. Plan B will not terminate a pregnancy that has already begun (the fertilized egg has attached to the uterus).

Before using Plan B, tell your doctor if you are allergic to any drugs, or if you have diabetes. You may not be able to use Plan B, or you may need special tests during treatment.

Levonorgestrel can pass into breast milk and may harm a nursing baby. Do not use Plan B without telling your doctor if you are breast-feeding a baby. Do not give Plan B to anyone younger than 17 years old. Contact a doctor for medical advice

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How should I take Plan B?
Use Plan B exactly as directed on the label, or as it has been prescribed by your doctor. Do not use the medication in larger amounts or for longer than recommended.

The first dose of Plan B must be taken as soon as possible after unprotected sex (no later than 72 hours afterward). The second dose must be taken 12 hours after the first dose. The timing of these doses is very important for Plan B to be effective.

Call your doctor right away if you vomit within 1 hour after taking either dose of Plan B. Do not take another dose until you talk with your doctor.

You should be examined by your doctor within 3 weeks after taking Plan B. The doctor will need to confirm that you are not pregnant and that Plan B has not caused any harmful effects.

If your period is late by 1 week or longer after the expected date, you may be pregnant. Get a pregnancy test and contact your doctor if you are pregnant. Plan B will not terminate a pregnancy that has already begun (the fertilized egg has attached to the uterus).

Store Plan B at room temperature away from moisture and heat.

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What happens if I miss a dose?
Missing a dose of Plan B increases your risk of being pregnant.

Contact your doctor if you miss a dose of Plan B. The timing of these doses is very important for Plan B to be effective.

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What happens if I overdose?
Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include nausea and vomiting.

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What should I avoid while taking Plan B?
Plan B will not protect you from sexually transmitted diseases--including HIV and AIDS. Using a condom is the only way to protect yourself from these diseases. Avoid having unprotected sex

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Plan B side effects
Get emergency medical help if you have any of these signs of an allergic reaction to Plan B: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have severe pain in your lower stomach or side. This could be a sign of a tubal pregnancy (a pregnancy that implants in the fallopian tube instead of the uterus). A tubal pregnancy is a medical emergency.

Less serious Plan B side effects may include:
nausea, diarrhea, or stomach pain;
breast pain or tenderness;
dizziness, tired feeling;
changes in your menstrual periods; or
headache.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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What other drugs will affect Plan B?
Before using Plan B, tell your doctor if you are using any of the following drugs:
rifampin (Rifadin, Rifater, Rifamate, Rimactane);
a barbiturate such as amobarbital (Amytal), butabarbital (Butisol), mephobarbital (Mebaral), secobarbital (Seconal), or phenobarbital (Luminal, Solfoton); or
seizure medicines such as phenytoin (Dilantin), or carbamazepine (Tegretol).

This list is not complete and there may be other drugs that can affect Plan B. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

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Where can I get more information?
Your pharmacist can provide more information about Plan B.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Plan B only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.