This is an index of side effect / adverse reaction reports (a.k.a. adverse event reports) related to Flagyl (Metronidazole) and submitted to the FDA during the sample period of about a year. The information is not vetted and should not be considered as verified clinical evidence.
Reports by Event Outcome
All Cases (352)
Death (27)
Life Threatening Events (11)
Disability (12)
Reports by Reaction Type
Drug Hypersensitivity (39),
Nausea (23),
Vomiting (20),
Diarrhoea (17),
Abdominal Pain (15),
Urticaria (15),
Confusional State (14),
Pyrexia (14),
NO Adverse Event (14),
Clostridium Difficile Colitis (13),
Headache (13),
Erythema (13)
Below are a few examples of reports where side effects / adverse reactions may be related to Flagyl (Metronidazole). For a complete list or a specific selection of reports, please use the links above.
Possible Flagyl side effects in
Reported by a consumer/non-health professional from Japan on 2012-08-27
Patient:
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Betamethasone Valerate
Dosage: unk
Start date: 2012-04-10
End date: 2012-05-07
Flagyl
Dosage: 1000 mg, unk
Administration route: Oral
Indication: Pseudomembranous Colitis
Start date: 2012-04-03
End date: 2012-04-04
Flagyl
Dosage: 1000 unk, unk
Administration route: Oral
Start date: 2012-04-29
End date: 2012-05-12
Vancomycin HCL
Dosage: 1 mg, unk
Start date: 2012-04-16
End date: 2012-04-29
Zyvox
Dosage: 1200 mg, unk
Start date: 2012-05-02
End date: 2012-05-15
Other drugs received by patient: Dorner; Aldactone; Dorner; Lebenin; Olopatadine HCL; Plavix; Pydoxal; Clobetasol Propionate; Hirudoid; Aspara K; Yunasupin; Vancomycin HCL; Gentamicin Sulfate; Nizoral; Hirudoid; Prednisolone; Plavix; Lebenin; Aspara K; Trichlormethiazide; Myser (Difluprednate); Myser (Difluprednate); Methylprednisolone Sodium Succinate
Possible Flagyl side effects in female
Reported by a physician from France on 2012-08-27
Patient: female
Reactions: Drug Eruption
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Administration route: Oral
Indication: Oral Candidiasis
Start date: 2011-08-13
End date: 2011-08-29
Lasix
Administration route: Oral
Indication: Hypertension
Start date: 2011-08-17
Propylthiouracil
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2011-08-18
End date: 2011-08-22
Rocephin
Indication: Bronchitis
Start date: 2011-08-11
End date: 2011-08-22
Rovamycine
Indication: Bronchitis
Start date: 2011-08-11
Roxithromycine
Administration route: Oral
Indication: Bronchitis
Start date: 2011-08-16
End date: 2011-08-23
Other drugs received by patient: Potassium Chloride; Potassium Chloride; Transipeg (France)
Possible Flagyl side effects in male
Reported by a health professional (non-physician/pharmacist) from France on 2012-08-23
Patient: male
Reactions: Intestinal Ischaemia, Abdominal Pain, Abdominal Distension, Intestinal Obstruction
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Acetaminophen
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-02
Acetaminophen
Indication: Product Used FOR Unknown Indication
Arixtra
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
End date: 2012-03-01
Arixtra
Start date: 2012-01-27
End date: 2012-03-01
Atarax
Dosage: evening
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Chlorpromazine HCL
Indication: Product Used FOR Unknown Indication
Start date: 2012-01-27
Codeine
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-01
End date: 2012-03-01
Flagyl
Indication: Product Used FOR Unknown Indication
Imodium
Start date: 2012-02-02
Imodium
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
End date: 2012-03-01
Nexium
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Quetiapine Fumarate
Administration route: Oral
Indication: Schizophrenia
Start date: 2012-02-06
Quetiapine Fumarate
Administration route: Oral
Start date: 2012-03-06
Rocephin
Indication: Product Used FOR Unknown Indication
Sandostatin
Dosage: 1 in the morning and 1 in the evening
Start date: 2012-03-01
End date: 2012-03-01
Sandostatin
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-01
End date: 2012-03-01
Spasfon
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-02
Tranxene
Dosage: in the evening
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Tranxene
Start date: 2012-01-27
End date: 2012-03-01
Possible Flagyl side effects in male
Reported by a consumer/non-health professional from United States on 2012-08-23
Patient: male
Reactions: Pain in Extremity
Drug(s) suspected as cause:
Flagyl
Possible Flagyl side effects in 59 year old female
Reported by a physician from United States on 2012-08-22
Patient: 59 year old female
Reactions: Toxic Encephalopathy
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Possible Flagyl side effects in 53 year old female
Reported by a physician from United States on 2012-08-22
Patient: 53 year old female
Reactions: Abdominal Pain, Diarrhoea, Pouchitis, Gastric Disorder, Muscle Spasms
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Dosage: unk
Indication: Pouchitis
Start date: 2012-05-01
End date: 2012-05-01
Humira
Dosage: 40 mg/0.8 ml
Indication: Crohn's Disease
Start date: 2010-01-01
Other drugs received by patient: Esomeprazole; Vincodin
Possible Flagyl side effects in 71 year old
Reported by a physician from United States on 2012-08-21
Patient: 71 year old
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Flagyl side effects in 77 year old female
Reported by a pharmacist from United States on 2012-08-21
Patient: 77 year old female, weighing 54.4 kg (119.7 pounds)
Reactions: Neuropathy Peripheral
Drug(s) suspected as cause:
Flagyl
Other drugs received by patient: Amlodipine
Possible Flagyl side effects in male
Reported by a health professional (non-physician/pharmacist) from France on 2012-08-20
Patient: male
Reactions: Abdominal Pain, Intestinal Ischaemia, Abdominal Distension, Intestinal Obstruction
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Acetaminophen
Indication: Product Used FOR Unknown Indication
Acetaminophen
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-02
Arixtra
Start date: 2012-03-06
End date: 2012-03-01
Arixtra
Indication: Product Used FOR Unknown Indication
Start date: 2012-01-27
End date: 2012-03-01
Atarax
Dosage: evening
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Chlorpromazine HCL
Indication: Product Used FOR Unknown Indication
Start date: 2012-01-27
Codeine
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-01
End date: 2012-03-01
Flagyl
Indication: Product Used FOR Unknown Indication
Imodium
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
End date: 2012-03-01
Imodium
Start date: 2012-02-02
Nexium
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Quetiapine Fumarate
Administration route: Oral
Start date: 2012-02-06
Quetiapine Fumarate
Administration route: Oral
Indication: Schizophrenia
Start date: 2012-03-06
Rocephin
Indication: Product Used FOR Unknown Indication
Sandostatin
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-01
End date: 2012-03-01
Sandostatin
Dosage: 1 in the morning and 1 in the evening
Start date: 2012-03-01
End date: 2012-03-01
Spasfon
Indication: Product Used FOR Unknown Indication
Start date: 2012-02-02
Tranxene
Dosage: in the evening
Indication: Product Used FOR Unknown Indication
Start date: 2012-03-06
Tranxene
Start date: 2012-01-27
End date: 2012-03-01
Possible Flagyl side effects in 7 year old male
Reported by a consumer/non-health professional from United States on 2012-08-20
Patient: 7 year old male, weighing 27.7 kg (60.9 pounds)
Reactions: Clostridial Infection
Drug(s) suspected as cause:
Flagyl
Possible Flagyl side effects in female
Reported by a physician from France on 2012-08-20
Patient: female
Reactions: Dysaesthesia, Paraesthesia
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Administration route: Oral
Indication: Mastoiditis
Start date: 2012-06-19
End date: 2012-07-26
Ofloxacin
Dosage: auricular drops 1.5mg/0.5ml
Administration route: Oral
Indication: Mastoiditis
Start date: 2012-06-19
Rocephin
Indication: Mastoiditis
Start date: 2012-06-19
Other drugs received by patient: Antalgic; Previscan
Possible Flagyl side effects in 71 year old
Reported by a physician from United States on 2012-08-20
Patient: 71 year old
Reactions: NO Adverse Event
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Flagyl side effects in 29 year old male
Reported by a physician from Singapore on 2012-08-13
Patient: 29 year old male
Reactions: Angioedema, Anaphylactic Reaction, Urticaria, Hypotension
Drug(s) suspected as cause:
Acyclovir
Indication: Product Used FOR Unknown Indication
Ceftriaxone
Indication: Product Used FOR Unknown Indication
Flagyl
Indication: Product Used FOR Unknown Indication
Toradol
Indication: Product Used FOR Unknown Indication
Possible Flagyl side effects in
Reported by a physician from Japan on 2012-08-13
Patient:
Reactions: Platelet Count Decreased, Erythema Multiforme
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Betamethasone
Dosage: unk mg, unk
Start date: 2012-04-10
End date: 2012-05-07
Flagyl
Dosage: 1000 mg, unk
Start date: 2012-04-29
End date: 2012-05-12
Flagyl
Dosage: 1000 mg, unk
Administration route: Oral
Indication: Pseudomembranous Colitis
Start date: 2012-04-03
End date: 2012-04-04
Vancomycin Hydrochloride
Dosage: 1 g, unk
Start date: 2012-04-16
End date: 2012-04-29
Zyvox
Dosage: 1200 mg, unk
Other drugs received by patient: Lebenin; Yunasupin; Gentamicin Sulfate; Dorner; Lebenin; Pydoxal; Nizoral; Methylprednisolone Sodium Succinate; Targocid; Dorner; Myser (Difluprednate); Olopatadine HCL; Prednisolone; Nicoranta; Plavix; Trichlormethiazide; Vancomycin Hydrochloride; Aspara K; Myser (Difluprednate); Plavix; Aldactone; Aspara K
Possible Flagyl side effects in 64 year old male
Reported by a health professional (non-physician/pharmacist) from Singapore on 2012-08-09
Patient: 64 year old male
Reactions: Periorbital Oedema
Drug(s) suspected as cause:
Flagyl
Dosage: (df)
Indication: Product Used FOR Unknown Indication
Vibramycin
Dosage: (df)
Indication: Product Used FOR Unknown Indication
Possible Flagyl side effects in 51 year old female
Reported by a consumer/non-health professional from United States on 2012-08-09
Patient: 51 year old female, weighing 68.5 kg (150.7 pounds)
Reactions: Drug Hypersensitivity, Urticaria
Drug(s) suspected as cause:
Flagyl
Dosage: 500 mg, 3x/day for 3 days
Indication: Skin Infection
Start date: 2012-04-30
End date: 2012-05-01
Flagyl
Dosage: 500 mg, daily from 4th day
Start date: 2012-05-01
End date: 2012-05-03
Possible Flagyl side effects in 72 year old female
Reported by a physician from France on 2012-08-08
Patient: 72 year old female, weighing 56.0 kg (123.2 pounds)
Reactions: Vascular Purpura
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Atacand
Administration route: Oral
Start date: 2012-04-01
End date: 2012-06-03
Esidrix
Administration route: Oral
Start date: 2012-04-01
End date: 2012-06-03
Flagyl
Administration route: Oral
Start date: 2012-04-01
Nexium
Administration route: Oral
Start date: 2012-04-01
End date: 2012-06-03
Other drugs received by patient: Sectral; Plavix; Acetaminophen
Possible Flagyl side effects in 84 year old
Reported by a physician from United States on 2012-08-07
Patient: 84 year old
Reactions: Nausea, Drug Intolerance, Drug Hypersensitivity
Drug(s) suspected as cause:
Codeine Sulfate
Dosage: unk
Flagyl
Dosage: unk
Possible Flagyl side effects in 58 year old female
Reported by a health professional (non-physician/pharmacist) from France on 2012-08-07
Patient: 58 year old female
Reactions: Convulsion
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Dosage: unk
Administration route: Oral
Indication: Candidiasis
Start date: 2012-07-18
End date: 2012-07-19
Fluconazole
Dosage: 200 mg, daily
Administration route: Oral
Indication: Candidiasis
Start date: 2012-07-18
End date: 2012-07-19
Rocephin
Dosage: unk
Administration route: Oral
Indication: Infection
Start date: 2012-03-29
End date: 2012-07-19
Other drugs received by patient: Lasix; Cyclosporine
Possible Flagyl side effects in 84 year old
Reported by a physician from United States on 2012-08-06
Patient: 84 year old
Reactions: Nausea, Drug Hypersensitivity
Drug(s) suspected as cause:
Codeine Sulfate
Dosage: unk
Flagyl
Dosage: unk
Possible Flagyl side effects in 72 year old female
Reported by a health professional (non-physician/pharmacist) from France on 2012-08-06
Patient: 72 year old female
Reactions: Vascular Purpura, Staphylococcal Infection, Pleurisy, Purulence, Blood Creatinine Increased
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Atacand
Dosage: (df oral)
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2012-04-01
End date: 2012-06-03
Esidrix
Dosage: (df oral)
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2012-04-01
End date: 2012-06-03
Flagyl
Dosage: (500 mg tid oral)
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2012-04-01
Nexium
Dosage: (20 mg, daily oral)
Administration route: Oral
Indication: Product Used FOR Unknown Indication
Start date: 2012-04-01
End date: 2012-07-03
Other drugs received by patient: Plavix; Sectral; Acetaminophen
Possible Flagyl side effects in 71 year old
Reported by a physician from United States on 2012-08-06
Patient: 71 year old
Reactions: Drug Hypersensitivity
Drug(s) suspected as cause:
Allopurinol
Dosage: unk
Flagyl
Dosage: unk
Keflex
Dosage: unk
Possible Flagyl side effects in 69 year old female
Reported by a individual with unspecified qualification from France on 2012-08-03
Patient: 69 year old female
Reactions: Incorrect Route of Drug Administration
Drug(s) suspected as cause:
Flagyl
Possible Flagyl side effects in female
Reported by a consumer/non-health professional from United States on 2012-08-03
Patient: female, weighing 69.9 kg (153.8 pounds)
Reactions: Flushing, Nausea, Feeling Hot, Rash Papular, Bacterial Infection, Skin Burning Sensation, Vaginal Infection, Paraesthesia
Drug(s) suspected as cause:
Flagyl
Indication: Vaginal Infection
Start date: 2012-03-01
End date: 2012-04-01
Flagyl
Indication: Bacterial Infection
Niaspan
Indication: Blood Cholesterol Increased
Start date: 2012-03-01
Other drugs received by patient: Zetia
Possible Flagyl side effects in 67 year old male
Reported by a health professional (non-physician/pharmacist) from France on 2012-08-02
Patient: 67 year old male
Reactions: Jaundice, Toxoplasmosis, Blood Bilirubin Increased, Gamma-Glutamyltransferase Increased, Cholangitis, Cholestasis
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Augmentin '500'
Indication: Superinfection
Augmentin '500'
Dosage: 1 g, 3x/day
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
Flagyl
Dosage: 500 mg, 2x/day
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
Flagyl
Indication: Superinfection
Ibuprofen (Advil)
Indication: Superinfection
Ibuprofen (Advil)
Dosage: 200 mg, 1x/day
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
Possible Flagyl side effects in
Reported by a consumer/non-health professional from Japan on 2012-08-02
Patient:
Reactions: NO Adverse Event, Atrioventricular Block Complete, Sepsis, Platelet Count Decreased, Cardiogenic Shock, Erythema Multiforme, Myocardial Infarction, Toxic Skin Eruption
Drug(s) suspected as cause:
Betamethasone Valerate
Dosage: unk
Start date: 2012-04-10
End date: 2012-05-07
Flagyl
Dosage: 1000 mg, unk
Administration route: Oral
Indication: Pseudomembranous Colitis
Start date: 2012-04-03
End date: 2012-04-04
Flagyl
Dosage: 1000 unk, unk
Administration route: Oral
Start date: 2012-04-29
End date: 2012-05-12
Vancomycin Hydrochloride
Dosage: 1 mg, unk
Start date: 2012-04-16
End date: 2012-04-29
Zyvox
Dosage: 1200 mg, unk
Start date: 2012-05-02
End date: 2012-05-15
Other drugs received by patient: Plavix; Lebenin; Yunasupin; Hirudoid; Aldactone; Aspara K; Nizoral; Hirudoid; Prednisolone; Dorner; Trichlormethiazide; Olopatadine HCL; Methylprednisolone Sodium Succinate; Clobetasol Propionate; Plavix; Dorner; Lebenin; Aspara K; Myser (Difluprednate); Pydoxal; Gentamicin Sulfate; Vancomycin Hydrochloride; Myser (Difluprednate)
Possible Flagyl side effects in
Reported by a consumer/non-health professional from United States on 2012-08-01
Patient:
Reactions: Contusion, Gastrointestinal Haemorrhage, Hyperkalaemia, Rectal Haemorrhage, Wheezing, Mouth Ulceration, Tongue Ulceration, Tachycardia, Blood PH Decreased, Oesophageal Candidiasis, Oedema Peripheral, Pulmonary Oedema, Thrombocytopenia, Candidiasis, Enterocolitis Haemorrhagic, Anaemia, Atrial Fibrillation, Pancytopenia, Odynophagia, Haemodialysis, Renal Failure, Fungal Infection, Respiratory Failure, Breath Sounds Abnormal, Platelet Count Decreased, Pseudomembranous Colitis, Bone Marrow Toxicity, Laryngeal Ulceration, Herpes Oesophagitis, Leukopenia
Adverse event resulted in: death, hospitalization
Drug(s) suspected as cause:
Dificid
Dosage: 200 mg, bid
Administration route: Oral
Indication: Clostridium Difficile Colitis
Start date: 2011-11-05
End date: 2011-11-01
Flagyl
Dosage: 500 mg, tid
Indication: Clostridium Difficile Colitis
Start date: 2011-11-01
End date: 2011-11-11
Vancocin Hydrochloride
Dosage: 200 mg, qid
Administration route: Oral
Start date: 2011-11-05
End date: 2011-11-06
Vancocin Hydrochloride
Dosage: unk
Start date: 2011-11-16
Vancocin Hydrochloride
Dosage: 125 mg, qid
Administration route: Oral
Indication: Clostridium Difficile Colitis
Start date: 2011-11-02
End date: 2011-11-04
Other drugs received by patient: Afluria; Humalog; Prilosec; Phenergan HCL; Proventil; Atrovent; Solu-Medrol; Oscal 250+d; Vitamin B-12; Advair Diskus 100 / 50; Lasix; Florastor; Protonix; Norco; Atrovent; Rocephin; Novolin R; Zofran; Restoril; Dextrose; Morphine Sulfate; Prednisone; Entocort EC; Celexa
Possible Flagyl side effects in female
Reported by a health professional (non-physician/pharmacist) from France on 2012-07-31
Patient: female
Reactions: Agranulocytosis, Sepsis
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Ceftriaxon
Dosage: (1 g qd intravenous (not otherwise specified))
Indication: Sepsis
Start date: 2012-06-26
End date: 2012-07-02
Etanercept (Etanercept)
Dosage: (df subcutaneous)
Indication: Rheumatoid Arthritis
Start date: 2011-09-01
Flagyl
Dosage: (df)
Indication: Sepsis
Start date: 2012-06-26
End date: 2012-06-26
Other drugs received by patient: Lodine; Tramadol HCL; Potassium Chloride; Acetaminophen; Prednisone TAB
Possible Flagyl side effects in female
Reported by a health professional (non-physician/pharmacist) from France on 2012-07-31
Patient: female
Reactions: Vomiting, Retinal Haemorrhage, Nausea, Lymphopenia, Scotoma, Fall, Paraesthesia, Hypokalaemia, Acute Polyneuropathy, Balance Disorder
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Flagyl
Other drugs received by patient: Aspirin; Athymil; Tacrolimus; Cellcept; Prednisone TAB; Rapamune; Lasix; Tranxene; Atorvastatin; Citalopram Hydrobromide
Possible Flagyl side effects in male
Reported by a health professional (non-physician/pharmacist) from France on 2012-07-31
Patient: male
Reactions: Toxoplasma Serology Positive, Cholangitis, Cholestasis, Hepatitis
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Advil
Dosage: 200 mg qd, oral
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
Augmentin
Dosage: 1 g tid oral
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
Flagyl
Dosage: 500 mg bid oral
Administration route: Oral
Indication: Chronic Sinusitis
Start date: 2012-05-09
End date: 2012-05-24
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