Flagyl: Exactly what are the important unwanted effects of Flagyl (metronidazole)

What’s Flagyl (metronidazole), and what exactly is it useful for?

Flagyl and Flagyl long Release (metronidazole) is an antibiotic utilized to deal with microbial and parasitic infections including Giardia infections of this intestine that is small amebic liver abscess, amebic dysentery, bacterial vaginosis, trichomonas genital infections, providers of trichomonas (both intimate lovers) that do n’t have apparent symptoms of disease; abscesses into the liver, pelvis, stomach, and brain; C. Difficile (C. Diff) diarrhoea; Helicobacter pylori (H. Pylori) which causes belly or abdominal ulcers; and rosacea that is acne.

Typical negative effects of Flagyl and Flagyl ER consist of nausea, headaches, lack of appetite, rash (rare), abdominal cramps, vomiting, diarrhoea, dry mouth, dark-colored urine, metallic flavor in lips, weight reduction, constipation, furry tongue, nasal congestion, flushing, and genital dryness.

Serious unwanted effects of Flagyl and Flagyl ER include mind condition, fevers, lips sores, painful urination, neurological damage causing prickling or tingling feelings that could be permanent, cystitis, pelvic discomfort or pressure, decreased sexual interest, irritation regarding the liner associated with the rectum, swelling for the mouth and lips, inflammation regarding the tongue, seizures, numbness and tingling of extremities, encephalopathy, aseptic meningitis, and cancer of the colon in individuals with Crohn’s condition.

Drug interactions with Flagyl and Flagyl ER consist of alcohol, warfarin, cimetidine, cholestyramine, amprenavir, propanediol, carbamazepine, lithium, and cyclosporine. Flagyl and Flagyl ER shouldn’t be utilized in early maternity due to prospective negative effects on the fetus. Flagyl and Flagyl ER are excreted in breast milk. As a result of prospective effects that are adverse the newborn, females that are nursing must not utilize metronidazole.

Do you know the side that is important of Flagyl (metronidazole)?

Flagyl is a good antibiotic and it is generally speaking well tolerated with appropriate usage.

The most typical and minor negative effects consist of:

Unwanted effects which are uncomfortable, but could become severe include:

  • Mind condition
  • Fevers
  • Mouth sores
  • Soreness with urination
  • Prickling or sensations that are tingling can become permanent
  • Cystitis
  • Pelvic pressure or pain
  • Loss of libido
  • Proctitis
  • Stomitis
  • Glossitis

Severe unwanted effects of Flagyl are unusual as well as the drug should really be stopped if these symptoms appear:

  • Seizures
  • Damage of nerves causing tingling and numbness of extremities
  • Peripheral neuropathy
  • Encephalopathy
  • Aseptic meningitis
  • Asceptic meningitis
  • Cancer of the colon in individuals with Crohn’s condition

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Flagyl (metronidazole) unwanted effects list for medical experts

The following reactions have been reported during therapy with metronidazole:

Nervous System

The absolute most severe side effects reported in patients addressed with metronidazole have now been convulsive seizures, encephalopathy, aseptic meningitis, optic and peripheral neuropathy, the latter characterized primarily by numbness or paresthesia of a extremity. Since persistent peripheral neuropathy was reported in a few clients getting extended administration of metronidazole, patients should always be especially warned about these responses and may find out to prevent the medication and report instantly for their physicians if any neurologic signs occur. In addition, clients have actually reported frustration, syncope, dizziness, vertigo, incoordination, ataxia, confusion, dysarthria, irritability, despair, weakness, and insomnia.


The most frequent effects reported have now been referable to your gastrointestinal tract, particularly sickness, sometimes followed closely by hassle, anorexia, and periodically vomiting; diarrhoea; epigastric stress; and stomach cramping and constipation.

A razor- sharp, unpleasant taste that is metallic not unusual. Furry tongue, glossitis, and stomatitis have taken place; these might be related to a unexpected overgrowth of candida which might occur during therapy.


Erythematous rash and pruritus.


Reversible neutropenia (leukopenia); seldom, reversible thrombocytopenia.


Flattening of this T-wave may be observed in electrocardiographic tracings.


Urticaria, erythematous rash, Stevens-Johnson Syndrome, toxic epidermal necrolysis, flushing, nasal congestion, dryness of this mouth (or vagina or vulva), and fever.

Dysuria, cystitis, polyuria, incontinence, and a feeling of pelvic force. Cases of darkened urine have already been reported by around one patient in 100,000. Even though pigment that will be most likely in charge of this occurrence is not absolutely identified, it really is most likely a metabolite of metronidazole and appears to have no significance that is clinical.

Expansion of Candida within the vagina, dyspareunia, loss of libido, proctitis, and fleeting joint pains sometimes resembling “serum vomiting. ” Infrequent cases of pancreatitis, which generally abated on withdrawal regarding the medication, have already been reported.

Patients with Crohn’s condition are recognized to have an elevated incidence of gastrointestinal and particular extraintestinal cancers. There were some reports in the literature that is medical of and a cancerous colon in Crohn’s condition patients who’ve been treated with metronidazole at high doses for longer periods of the time. An effect and cause relationship will not be founded. Crohn’s condition is not an approved indication for Flagyl pills.

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Just just What medications communicate with Flagyl (metronidazole)?


Psychotic responses are reported in alcoholic patients who’re making use of disulfiram and metronidazole concurrently. Metronidazole really should not be provided to clients that have taken disulfiram within the past two weeks.

Alcoholic Beverages

Abdominal cramps, sickness, vomiting, headaches, and flushing may possibly occur if alcohol consumption or items containing propanediol are consumed during or after metronidazole treatment.

Warfarin And other Oral Anticoagulants

Metronidazole happens to be reported to potentiate the anticoagulant effectation of warfarin as well as other dental coumarin anticoagulants, leading to a prolongation of prothrombin time. Whenever Flagyl is recommended for clients with this variety of anticoagulant therapy, prothrombin time and INR must be very very carefully checked.

In patients stabilized on reasonably high doses of lithium, short-term metronidazole treatment was related to level of serum lithium and, in a few situations, signs of lithium toxicity. Serum lithium and serum creatinine levels ought to be acquired days that are several starting metronidazole to identify any enhance which will precede clinical outward indications of lithium intoxication.

Metronidazole happens to be reported to boost plasma levels of busulfan, that may lead to a heightened risk for severe busulfan poisoning. Metronidazole really should not be administered concomitantly with busulfan unless the benefit outweighs the danger. If no healing alternatives to metronidazole are available, and concomitant management with busulfan is clinically required, regular track of busulfan plasma concentration must certanly be done plus the busulfan dose must certanly be modified appropriately.

Medications That Inhibit CYP450 Enzymes

The simultaneous administration of medications that decrease liver that is microsomal task, such as for instance cimetidine, may prolong the half-life and decrease plasma approval of metronidazole.

Medications That Induce CYP450 Enzymes

The simultaneous management of medications that induce microsomal liver enzymes, such as for instance phenytoin or phenobarbital, may speed up the reduction of metronidazole, causing paid off plasma amounts; impaired clearance of phenytoin has additionally been reported.

Drug/Laboratory Test Interactions

Metronidazole may restrict certain kinds of determinations of serum chemistry values, such as aspartate aminotransferase (AST, SGOT), alanine aminotransferase (ALT, SGPT), lactate dehydrogenase (LDH), triglycerides, and glucose hexokinase. Values of zero may be viewed. Most of the assays in which disturbance happens to be reported incorporate coupling that is enzymatic of assay to oxidation-reduction of nicotinamide adenine dinucleotide (NAD+ NADH). Disturbance is due to the similarity in absorbance peaks of NADH (340 nm) and metronidazole (322 nm) at pH 7.

Typical negative effects for the antibiotic Flagyl (metronidazole) consist of sickness, headaches, lack of appetite, vomiting, diarrhoea, dry mouth, dark-colored urine, metallic taste in lips, weight-loss, constipation, and dryness that is vaginal. Severe side effects include mind infection, fevers, lips sores, painful urination, neurological damage leading to prickling or tingling feelings which will be permanent, encephalopathy, aseptic meningitis, and cancer of the colon in people who have Crohn’s infection, and others.

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