HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

Does flagyl 500mg contain penicillin?

6 doctors weighed in across 3 answers
Dr. Hunter Handsfield answered

Specializes in Infectious Disease

Nope: Penicillin and metronidazole (Flagyl®) are entirely different antibiotics. Neither one "contains" the other. If you may have had a penicillin allergy and now have been prescribed metronidazole, you need not worry. There is no increased risk of an allergic reaction.

Dr Minich and 2 doctors agreed

Answered 11/28/2017

2.9k views

Thank

No: Flagyl only contains metronidazole. Penicillin contains penicillin. The pharmacist does not mix the two together. They are unrelated.

Answered 5/2/2015

2.9k views

Thank

No: It is not a penicillin.

Dr Khanna and another doctor agreed

Answered 5/3/2015

2.9k views

Thank

Related Questions

A member asked:

Hi, In a G6pd patient,if the patient is allergic to penicillins then what are the alternative medications to treat dental infections in such patients.? Also can metronidazole be given to a g6pd patient.? Thanks?

A doctor has provided 1 answer

A member asked:

Have mild Tetanus, but had reaction to metronidazole. In Mexico, was given option of doxycycline or Penicillin G injections instead, which is better?

2 doctors weighed in across 2 answers

A member asked:

Am i safe using lotions & conditioners while taking flagyl? they all seem to contain alcohol.

A doctor has provided 1 answer

A member asked:

Is it safe to use antibiotics that contain penicillin if I dont know if I am allergic to penicillin?

A doctor has provided 1 answer

A member asked:

If i am allergic to penicillin and bactrim, can i take ivermectin? Does it contain any of these two compounds inside?

A doctor has provided 1 answer

Sponsored Content
HealthTap Medical Group does not endorse products or services. Sponsored content revenues support our mission to make health information free and accessible to all.Learn more

People also searched for:

Prescribed Flagyl and penicillin. Can I have both on same day?
Flagyl metronldazole and penicillin pills can they both be use for a bv?
Can I use Flagyl to treat strep throat? I'm allergic to penicillin, bactrum, ceftin (cefuroxime) and levaqon.
Metronidazole pills and penicillin pills can u take it at the same time and what's the difference between metronidale and penicillin?
I have a lot of pain and facial swelling from a root canal retreat. I was given penicillin v and metronidazole. When will the swelling go down?

Telemedicine

Primary Care
Manage Your Conditions
Women's Health
Children's Health
Men's Health
Senior Health
Wellness, Prevention & Lifestyle
Sexual Health
Mental & Behavioral Health
Travel Medicine
Urgent Care
Ask your question
Didn't find what you're looking for?

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.

Ask your question

More of what we treat

Allergies
Antibiotics
Asthma
High Blood Pressure
Prescriptions
Type 2 Diabetes
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.
HealthTap
HIPAA logo
HIPAASecure
Soc 2 Type 2 logo
SOC 2 Type 2Certified
JCAHO Accredited
JCAHOAccredited
Member App

Download HealthTap

Video visit and message your doctor

Member App QR Code
Play Store Member LinkApp Store Member Link

Questions?

+1 (888) 828-0841support@healthtap.com
LinkedInTwitter
HomeTermsPrivacyCookiesDMCAHealth TopicsDoctors DirectoryDoctor Q&A by Specialty
Copyright 2026 HealthTap, Inc.