Plan b vs. Lo loestrin fe: side effect and effectiveness comparison (a real world drug study)
Summary:
We compare the side effects and drug effectiveness of Plan b and Lo loestrin fe. The phase IV clinical study is created by eHealthMe based on reports (from sources including the FDA) of 247,521 people who take Plan b and Lo loestrin fe, and is updated regularly.
What is Plan b?
Plan b has active ingredients of levonorgestrel. It is often used in birth control. eHealthMe is studying from 38,623 Plan b users. Check the latest studies of Plan b.
What is Lo loestrin fe?
Lo loestrin fe has active ingredients of ethinyl estradiol; norethindrone acetate. It is often used in birth control. eHealthMe is studying from 466 Lo loestrin fe users. Check the latest studies of Lo loestrin fe.
eHealthMe: drug outcomes in the real world
eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.
247,521 people who take Plan b and Lo loestrin fe are studied.

Drugs being compared in this study:
- Plan B (levonorgestrel)
- Lo Loestrin Fe (ethinyl estradiol; norethindrone acetate)
Most common side effects of the drugs, overall:
Most common side effects of the drugs, in long term (1+ years) use:
Drug effectiveness:
Plan B:
- not at all: 2.76 %
- somewhat: 6.65 %
- moderate: 11.1 %
- high: 30.88 %
- very high: 48.62 %
Lo Loestrin Fe:
- not at all: 1.71 %
- somewhat: 6.97 %
- moderate: 15.36 %
- high: 35.61 %
- very high: 40.36 %
Want to compare Plan b with Lo loestrin fe?
- Personalize this study to your gender and age (0-99+)How to use the study?
DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.
Related studies
Alternative drugs to, pros and cons of:
- Plan b (38,351 reports)
- Lo loestrin fe (236 reports)
Browse all side effects of Plan b:
a b c d e f g h i j k l m n o p q r s t u v w x y zBrowse all side effects of Lo loestrin fe:
a b c d e f g h i j k l m n o p q r s t u v w x y zHow the study uses the data?
The study is based on levonorgestrel and ethinyl estradiol; norethindrone acetate (the active ingredients of Plan b and Lo loestrin fe, respectively). Other drugs that have the same active ingredients (e.g. generic drugs or brand names) are also considered. Dosage of drugs is not considered in the study.
Who is eHealthMe?
With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).
WARNING, DISCLAIMER, USE FOR PUBLICATION
WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.
DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.
If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.
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