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Popular Brands: : Metronidazole, Flagyl, Metrogel, Clont, Metrocream
Official FDA Reports115,237
Social Media Events23,428
Total Posts9,732
Avg. Review Score2.87/ 5
Active Ingredients
  • Metronidazole
  • Actavis Laboratories Ut Inc
  • B Braun Medical Inc
  • Baxter Healthcare Corp
  • Galderma Laboratories Lp
  • Gd Searle Llc
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  This report is for all products sharing this active ingredient. For more details, please use our Workbench for research on individual brands like Metronidazole.

* Extracted from FDA Adverse Event Report


The quarterly trend chart illustrates changing levels of adverse events over time. Results from both the FDA Adverse Event Database (FAERS) and adverse events extracted from social media by Druginformer are plotted side-by-side for easy comparison.

The proportion of people completing user reviews who complained about a side effect.

The proportion of social media adverse event complaints for each adverse event type.

The proportion of FAERS (FDA) adverse event complaints for each adverse event type.

Metronidazole Side Effects

  Social Media
(Online Comments)
(Reports Submitted to FDA)
Side Effect On Drug
Reports % of
Alarm Reports % of

* DrugInformer calculates alarm using a proprietary algorithm. Alarm should not be taken as an ofiicial signal from the FDA or other regulatory entity.

User Voices

The following are comments from users that experienced side effects while taking Metronidazole

Condition Aggravated

Use 2x daily. Mostly works unless major flare

Source: MetroGel

View full report on Metronidazole related condition aggravated

Did the author experience condition aggravated while taking metrogel?

What is this?

Herpes Zoster

Stings a little but is working on my shingles

Source: MetroGel

View full report on Metronidazole related herpes zoster

Did the author experience herpes zoster while taking metrogel?

What is this?


Helped me reduce flushing .

Source: MetroGel

View full report on Metronidazole related flushing

Did the author experience flushing while taking metrogel?

What is this?

Tell us about your Experience with Metronidazole

Thank you for sharing your experience with us!

Share Your Experience

Druginformer Identified Side Effects: Nightmare

Effectiveness Rating:     Overall Rating:

Posted By Lauren on November 14, 2021 @ 8:39 am

Worst most horrible vivid nightmares. If you’ve ever slept on a nicotine patch then it’s like that, just the most vivid nightmares. Not worth it unless you absolutely need it. Try asking your doctor for a different antibiotic first.

Druginformer Identified Side Effects: Hyperhidrosis, Abdominal discomfort, Fatigue, Discomfort

Effectiveness Rating:     Overall Rating:

Posted By Stephanie on November 1, 2021 @ 1:44 am

This was the worst antibiotics I have taken. They have made me so miserable

Druginformer Identified Side Effects: Vision blurred, Fatigue, Headache

Effectiveness Rating:     Overall Rating:

Posted By Cee on April 11, 2019 @ 6:09 pm

Druginformer Identified Side Effects: Hypertension, Adverse event, Paraesthesia, Nausea, Asthenia, Sleep disorder, Body temperature, Chest pain

Effectiveness Rating:     Overall Rating:

Posted By Richard on May 26, 2018 @ 5:00 pm

I would be careful with taking this medicine it really hurt me badly

Druginformer Identified Side Effects: Feeling drunk, Pain, Dysgeusia, Confusional state, Syncope, Euphoric mood, Fatigue

Effectiveness Rating:     Overall Rating:

Posted By Karen on December 28, 2017 @ 3:22 pm

This Drug was strange, I always felt like i didn't know what was going on around me, working was difficult. I ALWAYS had a bad taste in my mouth like i had been poisoned. I had been told by my dentist that 1 out of 20 people would get very ill if taking the medication and having booze, (i could have some but it was not recommended) I decided to chance it for Christmas time and after one glass i thought i was dying. My stomach swelled up and when i puked it was a mess; there was more pressure behind it than a fire hose. NOT a fun experience but i'm glad to see the everyday symptoms are similar to everyone else here. Even just typing this took longer than it should of and i'm sure i pulled something in my back because i'm so stiff.

Druginformer Identified Side Effects: Cardiac flutter

Effectiveness Rating:     Overall Rating:

Posted By Carey on December 25, 2017 @ 12:19 pm

As I have paroxysmal afib, it was irresponsible for doc and pharmacists to provide this med which can elevate heart rate which could morph into afib attack and possiblly worse. Purpose was for possible infection in gums adjacent to site of tooth extraction. Butt they had already prescribed augmentin, which apparently does no harm to heart. You rellly have to do your own research to keep from becoming a statistic.

Druginformer Identified Side Effects: Dizziness, Nausea, Fatigue, Gait disturbance, Euphoric mood, Feeling drunk

Effectiveness Rating:     Overall Rating:

Posted By page on September 19, 2017 @ 2:23 pm

his is the worst antibiotic i have ever taken. the side effects are TERRIBLE. if you have the chance, do not take this drug. you will regret it.

Druginformer Identified Side Effects: Heart rate irregular, Fatigue

Effectiveness Rating:     Overall Rating:

Posted By Jessica on September 18, 2017 @ 11:59 pm

I felt it was working after the first dose, but by day 3 & day 4 (today) I'm having heart palpitations all day.

Druginformer Identified Side Effects: Arthralgia, Dizziness, Chills, Anxiety, Urine colour abnormal

Posted By Anonymous in askapatient.com on September 17, 2015 @ 12:00 am

Side Effects: Dark urine, horrible neck, back, joint pains, chills, dizziness, anxiety I was put on this medication for C-Diff which I had contracted due to an earlier antibiotic. Yes, it ...

Druginformer Identified Side Effects: Headache, Fatigue, Feeling abnormal, Abdominal distension, Depression

Posted By Anonymous in askapatient.com on September 13, 2015 @ 12:00 am

Side Effects: Had massive headaches at back of head. Felt spaced out. Bloated. Felt depressed. Had to stop taking them after 3 days. Very tired too. Took about 4 days to feel more normal.

Additional Drug Information

* Warning: The facts and figures contained in these reports are accurate to the best of our capability; however, our metrics are only meant to augment your medical knowledge, and should never be used as the sole basis for selecting a new medication. As with any medical decision, be sure to work with your doctor to ensure the best choices are made for your condition.

* About FAERS: The FDA Adverse Event Reporting System (FAERS) is used by FDA for activities such as looking for new safety concerns that might be related to a marketed product, evaluating a manufacturer's compliance to reporting regulations and responding to outside requests for information. Reporting of adverse events is a voluntary process, and not every report is sent to FDA and entered into FAERS. The FAERS database may contain duplicate reports, the report quality is variable, and many factors may influence reporting (e.g., media attention, length of time a drug is marketed, market share). For these reasons, FAERS case reports cannot be used to calculate incidence or estimates of risk for a particular product or compare risks between products.