Brought to you by Merck & Co, Inc., Rahway, NJ, USA (known as MSD outside the US and Canada) — dedicated to using leading-edge
science to save and improve lives around the world. Learn more about the MSD Manuals and our commitment to Global Medical
Knowledge. [/en/professional/resourcespages/global-medical-knowledge]

Copy Link

PPT CV

PPT MVM

PPT PV

citation

Reddit

Quora

Facebook

WhatsApp

Telegram

snapchat

messenger

Pinterest

Chewy

Chewy1

TestChewy

Professional

Tables

Comparison of Fertility Awareness‒Based Methods of Contraception

Additional Content

Also of Interest

Drug Name

The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.

Leave this Site? 

Google+

Key Chapters Consumer

Key Topics it this Section

Language Fallback

Original title:

Generic Drug Names A - Z

LinkedIn

The following topic from a MSD Manual has been sent to you: 
%0D%0A
%0D%0A
{title} 
%0D%0A
%0D%0A
{link} 

Mail

Drug Information

Odnoklassniki

Find information on medical topics, symptoms, drugs, procedures, news and more, written for the health care professional.

<h4>Advanced Search:</h4>
<ul>
    <li><strong>Use &ldquo; &ldquo; for exact phrases.</strong>
    <ul>
        <li>For example: &ldquo;pediatric abdominal pain&rdquo;</li>
    </ul>
    </li>
    <li><strong>Use &ndash; to remove results with certain keywords.</strong>
    <ul>
        <li>For example: abdominal pain -pediatric</li>
    </ul>
    </li>
    <li><strong>Use OR to account for alternate keywords.</strong>
    <ul>
        <li>For example: teenager OR adolescent</li>
    </ul>
    </li>
</ul>

Enter search terms to find related medical topics, multimedia and more.

Search results for:

Information that is clear and easy to understand on thousands of medical disorders and symptoms

Learn about SectionName symptoms, diagnosis and treatment in the MSD Manual. HCP and Vet versions too!

Learn about $TopicName symptoms, diagnosis and treatment in the MSD Manual. HCP and Vet versions too!

MSDManuals.com

The trusted provider of medical information since 1899

MSD MANUAL - Professional Version

IN THIS TOPIC

Topic Resources

TwitterTitle

Was This Page Helpful?

Share to Wechat

Weibo

NOTE: This feature requires the English language package to be installed in your operating system.

professional

Method	Pregnancy Rate in First Year of Use With Perfect Use	Pregnancy Rate in First Year of Use With Typical Use
Standard days	5%	12%
Two-day	4%	14%
Symptothermal	< 1%	2%