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Metronidazole Side Effects

PatientsVille

Common Metronidazole Side Effects


The most commonly reported Metronidazole side effects (click to view or check a box to report):

Dizziness (123)
Dysarthria (123)
Vomiting (119)
Nausea (107)
Encephalopathy (106)
Diarrhoea (102)
Paraesthesia (93)
Headache (88)
Confusional State (80)
Ataxia (80)
Toxic Encephalopathy (71)
Pruritus (67)
Gait Disturbance (62)
Pain (60)
Neuropathy Peripheral (60)
Pyrexia (58)
Cerebellar Syndrome (58)
Rash (56)
Urticaria (51)
Malaise (49)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Metronidazole Side Effects Reported to FDA



Metronidazole Side Effect Report#9892358
Cutaneous Vasculitis
This is a report of a 46-year-old female patient (weight: NA) from NL, suffering from the following health symptoms/conditions: rosacea, who was treated with Metronidazole (dosage: 250 Mg, Bid, start time:
Jan 10, 2014), combined with:
  • Ranitidine (Unk)
  • Desloratadine
  • Ethinylestradiol W/levonorgestrel (1 Df, Cyclical)
and developed a serious reaction and side effect(s): Cutaneous Vasculitis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in female patients, resulting in Cutaneous Vasculitis side effect.
Metronidazole Side Effect Report#9892011
Porphyria Acute, Blood Pressure Increased
This report suggests a potential Metronidazole (metronidazole) (metronidazole) Porphyria Acute side effect(s) that can have serious consequences. A 23-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: pelvic inflammatory disease and used Metronidazole (metronidazole) (metronidazole) (dosage: NA) starting NS. After starting Metronidazole (metronidazole) (metronidazole) the patient began experiencing various side effects, including: Porphyria Acute, Blood Pressure IncreasedAdditional drugs used concurrently:
  • Ceftriaxone (ceftriaxone) (ceftriaxone)
  • Doxycycline (doxycycline) (doxycycline)
The patient was hospitalized. Although Metronidazole (metronidazole) (metronidazole) demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Porphyria Acute, may still occur.
Metronidazole Side Effect Report#9890939
Kounis Syndrome, Acute Myocardial Infarction, Stridor, Angioedema
This Kounis Syndrome problem was reported by a health professional from US. A 28-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Metronidazole (dosage: NA). The following drugs were being taken at the same time:
  • Levofloxacin
  • Piperacillin/tazobactam ( Pip/tazo) ( Piperacillin Sodium, Tazobactam Sodium)
When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Kounis Syndrome, Acute Myocardial Infarction, Stridor, AngioedemaThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Kounis Syndrome, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9888011
Nausea, Vomiting
This Nausea side effect was reported by a health professional from SG. A 53-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Metronidazole (metronidazole) (metronidazole) (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Curam (amoxi-clavulanico) (amoxicillin, Clavulanic Acid)
  • Mefenamic Acid (mefenamic Acid) (mefenamic Acid)
  • Naproxen (naproxen) (naproxen)
.After starting to take Metronidazole (metronidazole) (metronidazole) the consumer reported adverse symptoms, such as: Nausea, VomitingThese side effects may potentially be related to Metronidazole (metronidazole) (metronidazole).
Metronidazole Side Effect Report#9886269
Dyspnoea, Diarrhoea, Abdominal Pain Lower, Proctalgia, Pharyngeal Oedema, Swollen Tongue, Vomiting
This is a report of a 47-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: infection,back pain,off label use, who was treated with Metronidazole 500 Mg / 100 Ml Intravenous Infusion (dosage: NA, start time:
Jan 21, 2014), combined with: NA. and developed a serious reaction and side effect(s): Dyspnoea, Diarrhoea, Abdominal Pain Lower, Proctalgia, Pharyngeal Oedema, Swollen Tongue, Vomiting after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole 500 Mg / 100 Ml Intravenous Infusion treatment in female patients, resulting in Dyspnoea side effect. The patient was hospitalized.
Metronidazole Side Effect Report#9880875
Eye Swelling
This report suggests a potential Metronidazole (metronidazole) Eye Swelling side effect(s) that can have serious consequences. A 43-year-old female patient (weight: NA) from SG was diagnosed with the following symptoms/conditions: NA and used Metronidazole (metronidazole) (dosage: NA) starting NS. After starting Metronidazole (metronidazole) the patient began experiencing various side effects, including: Eye SwellingAdditional drugs used concurrently:
  • Paracetamol (paracetamol)
  • Bactrim
  • Ibuprofen (ibuprofen)
Although Metronidazole (metronidazole) demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Eye Swelling, may still occur.
Metronidazole Side Effect Report#9879760
Proctalgia, Pharyngeal Oedema, Swollen Tongue, Dyspnoea, Vomiting, Diarrhoea, Abdominal Pain Lower
This Proctalgia problem was reported by a health professional from GB. A 47-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: back pain. On
Jan 21, 2014 this consumer started treatment with Metronidazole (dosage: 400 Mg, Only 1 Dose Taken). The following drugs were being taken at the same time: NA. When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Proctalgia, Pharyngeal Oedema, Swollen Tongue, Dyspnoea, Vomiting, Diarrhoea, Abdominal Pain LowerThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Proctalgia, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9870945
Arthralgia, Joint Swelling, Gait Disturbance
This Arthralgia side effect was reported by a consumer or non-health professional from GB. A 83-year-old male patient (weight:NA) experienced the following symptoms/conditions: tooth abscess.The patient was prescribed Metronidazole (drug dosage: NA), which was initiated on
Jan 06, 2014. Concurrently used drugs:
  • Amlodipine
  • Captopril
  • Simvastatin
  • Tamsulosin Hydrochloride
.After starting to take Metronidazole the consumer reported adverse symptoms, such as: Arthralgia, Joint Swelling, Gait DisturbanceThese side effects may potentially be related to Metronidazole.
Metronidazole Side Effect Report#9870132
Dysgeusia, Vomiting, Dizziness, Pyrexia, Pain, Pain In Extremity, Asthenia
This is a report of a 26-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: vaginal infection, who was treated with Metronidazole (dosage: NA, start time:
Jan 15, 2014), combined with:
  • Progesterone
  • Multivitamin
and developed a serious reaction and side effect(s): Dysgeusia, Vomiting, Dizziness, Pyrexia, Pain, Pain In Extremity, Asthenia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in female patients, resulting in Dysgeusia side effect.
Metronidazole Side Effect Report#9869692
Pseudomembranous Colitis, Clostridium Test Positive
This report suggests a potential Metronidazole Pseudomembranous Colitis side effect(s) that can have serious consequences. A 51-year-old male patient (weight: NA) from JP was diagnosed with the following symptoms/conditions: NA and used Metronidazole (dosage: NA) starting NS. After starting Metronidazole the patient began experiencing various side effects, including: Pseudomembranous Colitis, Clostridium Test PositiveAdditional drugs used concurrently:
  • Aztreonam
  • Ciprofloxacin
  • Clindamycin
  • Cefepime Hydrochloride
  • Cefmetazole
  • Paromomnycin
Although Metronidazole demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Pseudomembranous Colitis, may still occur.
Metronidazole Side Effect Report#9866453
Joint Swelling, Arthralgia
This Joint Swelling problem was reported by a health professional from GB. A 83-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: tooth abscess. On
Jan 06, 2014 this consumer started treatment with Metronidazole (dosage: 200 Mg, Unk). The following drugs were being taken at the same time:
  • Captopril (50 Mg, Unk)
  • Amlodipine (5 Mg, Unk)
  • Tamsulosin Hydrochloride (0.4 Mg, Unk)
  • Simvastatin (20 Mg, Unk)
When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Joint Swelling, ArthralgiaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Joint Swelling, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9858250
Anxiety, Inflammation, Panic Attack, Atrial Flutter, Insomnia
This Anxiety side effect was reported by a consumer or non-health professional from US. A 30-year-old female patient (weight:NA) experienced the following symptoms/conditions: inflammation.The patient was prescribed Metronidazole (flagyl) 500mg (drug dosage: NA), which was initiated on
Jan 01, 2014. Concurrently used drugs: NA..After starting to take Metronidazole (flagyl) 500mg the consumer reported adverse symptoms, such as: Anxiety, Inflammation, Panic Attack, Atrial Flutter, InsomniaThese side effects may potentially be related to Metronidazole (flagyl) 500mg.
Metronidazole Side Effect Report#9845455
Anaphylactic Reaction, Blood Pressure Decreased, Urticaria
This is a report of a 28-year-old male patient (weight: NA) from NO, suffering from the following health symptoms/conditions: antibiotic prophylaxis, who was treated with Metronidazole (dosage: NA, start time:
Dec 16, 2013), combined with:
  • Doxycycline
  • Gentamicin
and developed a serious reaction and side effect(s): Anaphylactic Reaction, Blood Pressure Decreased, Urticaria after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in male patients, resulting in Anaphylactic Reaction side effect.
Metronidazole Side Effect Report#9845115
Liver Injury
This report suggests a potential Metronidazole Liver Injury side effect(s) that can have serious consequences. A 72-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: cellulitis and used Metronidazole (dosage: NA) starting
Dec 19, 2013. After starting Metronidazole the patient began experiencing various side effects, including: Liver InjuryAdditional drugs used concurrently:
  • Teicoplanin Sodium (teicoplanin) (teicoplanin)
  • Humulin (human Mixtard) (insulin Human, Insulin Human Injection, Isophane)
  • Metformin (metformin) (metformin)
  • Simvastatin (simvastatin) (simvastatin)
  • Omeprazole (omeprazole) (omeprazole)
  • Citalopram (citlopram) (citlopram)
Although Metronidazole demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Liver Injury, may still occur.
Metronidazole Side Effect Report#9845092
Dyspnoea, Swelling, Urticaria
This Dyspnoea problem was reported by a health professional from GB. A 67-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: tooth abscess. On
Dec 13, 2013 this consumer started treatment with Metronidazole (dosage: NA). The following drugs were being taken at the same time:
  • Thyroxine Sodium
When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Dyspnoea, Swelling, UrticariaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Dyspnoea, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9844865
Lip Ulceration, Swelling Face, Local Swelling, Local Swelling
This Lip Ulceration side effect was reported by a health professional from GB. A 72-year-old female patient (weight:NA) experienced the following symptoms/conditions: sepsis.The patient was prescribed Metronidazole (drug dosage: NA), which was initiated on
Dec 19, 2013. Concurrently used drugs:
  • Teicoplanin
  • Paracetamol
  • Lansoprazole
  • Gabapentin
  • Morphine Sulfate
  • Metoclopramide
  • Ondansetron
  • Fentanyl
.After starting to take Metronidazole the consumer reported adverse symptoms, such as: Lip Ulceration, Swelling Face, Local Swelling, Local SwellingThese side effects may potentially be related to Metronidazole.
Metronidazole Side Effect Report#9832741
Liver Injury, Liver Function Test Abnormal
This is a report of a 72-year-old male patient (weight: NA) from GB, suffering from the following health symptoms/conditions: cellulitis, who was treated with Metronidazole (dosage: NA, start time:
Dec 19, 2013), combined with:
  • Teicoplanin (600 Milligram Daily;)
  • Humulin
  • Metformin
  • Simvastatin
  • Omeprazole
  • Citalopram
and developed a serious reaction and side effect(s): Liver Injury, Liver Function Test Abnormal after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in male patients, resulting in Liver Injury side effect.
Metronidazole Side Effect Report#9832054
Deafness Neurosensory
This report suggests a potential Metronidazole Deafness Neurosensory side effect(s) that can have serious consequences. A 23-year-old female patient (weight: NA) from IR was diagnosed with the following symptoms/conditions: diarrhoea,blastocystis infection and used Metronidazole (dosage: 750 Mg, 3x/day) starting NS. After starting Metronidazole the patient began experiencing various side effects, including: Deafness NeurosensoryAdditional drugs used concurrently: NA.The patient was hospitalized. Although Metronidazole demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Deafness Neurosensory, may still occur.
Metronidazole Side Effect Report#9832048
Encephalopathy, Ataxia, Hypotonia, Hyporeflexia, Dysarthria
This Encephalopathy problem was reported by a health professional from JP. A 67-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: clostridium difficile colitis. On NS this consumer started treatment with Metronidazole (dosage: 1.5 G, Daily). The following drugs were being taken at the same time: NA. When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Encephalopathy, Ataxia, Hypotonia, Hyporeflexia, DysarthriaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Encephalopathy, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9826973
Pain, Skin Exfoliation, Product Substitution Issue
This Pain side effect was reported by a pharmacist from US. A 62-year-old female patient (weight:NA) experienced the following symptoms/conditions: rosacea.The patient was prescribed Metronidazole (drug dosage: Apply 1 Inch), which was initiated on 201307. Concurrently used drugs: NA..After starting to take Metronidazole the consumer reported adverse symptoms, such as: Pain, Skin Exfoliation, Product Substitution IssueThese side effects may potentially be related to Metronidazole.
Metronidazole Side Effect Report#9822004
Leukopenia
This is a report of a 31-year-old male patient (weight: NA) from SG, suffering from the following health symptoms/conditions: NA, who was treated with Metronidazole (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Leukopenia after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in male patients, resulting in Leukopenia side effect.
Metronidazole Side Effect Report#9820486
Deafness Bilateral, Tinnitus, Tenderness, Deafness Neurosensory, Pain In Extremity
This report suggests a potential Metronidazole Deafness Bilateral side effect(s) that can have serious consequences. A 23-year-old female patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: blastocystis infection and used Metronidazole (dosage: 3 Times/d) starting NS. After starting Metronidazole the patient began experiencing various side effects, including: Deafness Bilateral, Tinnitus, Tenderness, Deafness Neurosensory, Pain In ExtremityAdditional drugs used concurrently: NA.The patient was hospitalized. Although Metronidazole demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Deafness Bilateral, may still occur.
Metronidazole Side Effect Report#9818291
Swelling, Urticaria, Dyspnoea
This Swelling problem was reported by a health professional from GB. A 67-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: tooth abscess. On
Dec 13, 2013 this consumer started treatment with Metronidazole (dosage: NA). The following drugs were being taken at the same time:
  • Thyroxine
When using Metronidazole, the patient experienced the following unwanted symptoms/side effects: Swelling, Urticaria, DyspnoeaAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Swelling, may become evident only after a product is in use by the general population.
Metronidazole Side Effect Report#9817187
Disorientation, Wound Secretion, Swelling Face, Erythema, Skin Exfoliation
This Disorientation side effect was reported by a health professional from GB. A female patient (weight:NA) experienced the following symptoms/conditions: tooth abscess.The patient was prescribed Metronidazole (drug dosage: 200 Mg, Tid), which was initiated on
Dec 18, 2012. Concurrently used drugs: NA..After starting to take Metronidazole the consumer reported adverse symptoms, such as: Disorientation, Wound Secretion, Swelling Face, Erythema, Skin ExfoliationThese side effects may potentially be related to Metronidazole.
Metronidazole Side Effect Report#9815736
Anaphylactic Reaction
This is a report of a 69-year-old female patient (weight: NA) from SG, suffering from the following health symptoms/conditions: postoperative care,prophylaxis, who was treated with Metronidazole (dosage: 500 Mg; X1; Iv, start time: 201009), combined with: NA. and developed a serious reaction and side effect(s): Anaphylactic Reaction after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Metronidazole treatment in female patients, resulting in Anaphylactic Reaction side effect.


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The appearance of Metronidazole on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Metronidazole Side Effects for Women?

Women Side EffectsReports
Nausea 87
Vomiting 86
Dizziness 85
Headache 69
Diarrhoea 68
Pruritus 56
Pain 54
Paraesthesia 52
Confusional State 51
Pyrexia 42

What are common Metronidazole Side Effects for Men?

Men Side EffectsReports
Dysarthria 80
Encephalopathy 57
Ataxia 49
Toxic Encephalopathy 49
Cerebellar Syndrome 39
Paraesthesia 39
Dizziness 37
Neuropathy Peripheral 31
Vomiting 31
Diarrhoea 30

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Metronidazole reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

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    Metronidazole Safety Alerts, Active Ingredients, Usage Information

    NDC0069-2390
    TypeHUMAN PRESCRIPTION DRUG
    Proprietary NameMetronidazole
    NameMetronidazole
    Dosage FormINJECTION, SOLUTION
    RouteINTRAVENOUS
    On market since20081120
    LabelerPfizer Labs, Division of Pfizer Inc
    Active Ingredient(s)METRONIDAZOLE
    Strength(s)500
    Unit(s)mg/100mL
    Pharma ClassNitroimidazole Antimicrobial [EPC],Nitroimidazoles [Chemical/Ingredient]

    Metronidazole Dosage, Warnings, Usage.

    Side Effects reported to FDA: 1819

    Metronidazole safety alerts: 2011 2010

    Reported deaths: 133

    Reported hospitalizations: 682

    Latest Metronidazole clinical trials