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Flagyl vs. Doryx: side effect and effectiveness comparison (a real world drug study)

Summary:

We compare the side effects and drug effectiveness of Flagyl and Doryx. The phase IV clinical study is created by eHealthMe based on reports (from sources including the FDA) of 150,150 people who take Flagyl and Doryx, and is updated regularly.

What is Flagyl?

Flagyl has active ingredients of metronidazole. It is often used in vaginitis bacterial. eHealthMe is studying from 25,897 Flagyl users. Check the latest studies of Flagyl.

What is Doryx?

Doryx has active ingredients of doxycycline hyclate. It is often used in acne. eHealthMe is studying from 901 Doryx users. Check the latest studies of Doryx.

On Aug, 02, 2026

150,150 people who take Flagyl and Doryx are studied.

Flagyl vs Doryx drug comparison reports.

Drugs being compared in this study:

  • Flagyl (metronidazole)
  • Doryx (doxycycline hyclate)

Most common side effects of the drugs, overall:

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Most common side effects of the drugs, in long term (1+ years) use:

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Drug effectiveness:

Flagyl:

  • not at all: 8.35 %
  • somewhat: 21.86 %
  • moderate: 28.42 %
  • high: 30.68 %
  • very high: 10.69 %

Doryx:

  • not at all: 6.52 %
  • somewhat: 30.43 %
  • moderate: 29.5 %
  • high: 25.49 %
  • very high: 8.06 %

Want to compare Flagyl with Doryx?

- 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:

Browse all side effects of Flagyl:

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 z

Browse all side effects of Doryx:

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 z

How the study uses the data?

The study is based on metronidazole and doxycycline hyclate (the active ingredients of Flagyl and Doryx, 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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