Title: Metronidazole: A Comprehensive Guide


Metronidazole is an antibiotic and antiprotozoal medication widely used to treat various infections caused by susceptible anaerobic bacteria and protozoa. This article will provide an in-depth look at Metronidazole, covering its uses, precautions, side effects, interactions, and more.


Metronidazole, a nitroimidazole derivative, has been widely used since its introduction in the 1960s. It exhibits bactericidal and antiprotozoal activity against anaerobic organisms, making it an effective treatment for a variety of infections. The drug is available in various forms, such as oral tablets, intravenous injection, topical creams, gels, and vaginal suppositories.

User Ratings

Metronidazole has generally received positive feedback from users due to its effectiveness in treating infections caused by anaerobic bacteria and protozoa. However, some users have reported side effects, which will be discussed later in this article.


Before using Metronidazole, patients should inform their healthcare provider if they have a history of:

  • Allergies to Metronidazole or any other ingredients in the medication
  • Blood disorders
  • Liver disease
  • Kidney disease
  • Alcohol use
  • Nervous system disorders, such as seizures or peripheral neuropathy


Metronidazole is used to treat a variety of infections, including:

  • Bacterial vaginosis
  • Trichomoniasis
  • Giardiasis
  • Amebiasis
  • Pelvic inflammatory disease (PID)
  • Intra-abdominal infections
  • Skin and soft tissue infections
  • Bone and joint infections
  • Respiratory tract infections
  • Dental infections

Manufacturer and Generic Availability

Metronidazole is available as a generic medication, which means it can be manufactured and sold by multiple pharmaceutical companies. The drug’s patent has expired, allowing for more affordable options for patients.

Drug Class

Metronidazole belongs to the drug class known as nitroimidazoles, which are characterized by their antimicrobial activity against anaerobic bacteria and certain protozoa.

Side Effects

Like all medications, Metronidazole can cause side effects. Some common side effects include:

  • Nausea
  • Vomiting
  • Diarrhea
  • Metallic taste in the mouth
  • Headache
  • Dizziness
  • Loss of appetite

Serious side effects are rare but can include:

  • Seizures
  • Tingling or numbness in the hands or feet (peripheral neuropathy)
  • Severe skin reactions
  • Persistent vomiting or diarrhea
  • Signs of liver problems (e.g., dark urine, persistent nausea, yellowing of the eyes or skin)

Drug Interactions

Metronidazole can interact with other medications, which may affect its efficacy or increase the risk of side effects. Some potential interactions include:

  • Anticoagulants, such as warfarin, which can lead to an increased risk of bleeding
  • Alcohol, which can cause a severe reaction (disulfiram-like reaction) with symptoms like headache, flushing, nausea, and vomiting
  • Lithium, which can lead to increased lithium levels and toxicity
  • Cimetidine, which can increase Metronidazole levels in the blood
  • Phenytoin or phenobarbital, which can decrease Metronidazole levels in the blood

Drug Precautions

Patients should take the following precautions when using Metronidazole:

  • Avoid consuming alcohol during treatment and for at least 48 hours after the last dose
  • Inform healthcare providers about all medications, including over-the-counter drugs and herbal products, being taken
  • Complete the entireprescribed course of Metronidazole, even if symptoms improve before the medication is finished, to prevent antibiotic resistance and recurrence of infection
    • Seek immediate medical attention if severe side effects or allergic reactions occur

    Food Interactions

    There are no significant food interactions with Metronidazole, but it is recommended to take the medication with food to reduce the risk of gastrointestinal side effects such as nausea and stomach upset.

    Brand Name in Bangladesh

    In Bangladesh, Metronidazole is available under various brand names, including Amodis, Metrogyl, Flagyl, and Nidazole.


    Metronidazole should be used with caution during pregnancy, particularly during the first trimester. Although studies have not shown a direct link between the drug and birth defects, the potential risks should be weighed against the benefits. Pregnant women should discuss the use of Metronidazole with their healthcare provider.


    Metronidazole is excreted in breast milk, and breastfeeding mothers should use caution when taking the medication. The drug can cause side effects in nursing infants, such as diarrhea and candidiasis (thrush). It is advised to consult a healthcare provider to discuss the risks and benefits of using Metronidazole while breastfeeding.

    Drug Usage

    Patients should follow their healthcare provider’s instructions when taking Metronidazole. The medication is typically taken orally, either as a tablet or liquid suspension. The specific dosage and duration of treatment will depend on the type and severity of the infection being treated.

    Drug Dosage

    The dosage of Metronidazole varies based on the patient’s age, weight, and the type of infection being treated. Healthcare providers will determine the appropriate dosage for each individual patient. It is important to follow the prescribed dosage regimen and complete the entire course of treatment, even if symptoms improve before the medication is finished.


    In case of an overdose, patients may experience symptoms such as nausea, vomiting, dizziness, loss of coordination, and seizures. If an overdose is suspected, patients should seek immediate medical attention or contact a poison control center.


    Metronidazole was first synthesized in 1955 by researchers at Rhône-Poulenc Laboratories in France. It was introduced for clinical use in the 1960s and has since become a staple in the treatment of anaerobic bacterial and protozoal infections. Metronidazole’s efficacy, combined with its low cost and wide availability, has made it a valuable addition to the global arsenal of antimicrobial agents.


    Metronidazole is an effective antibiotic and antiprotozoal medication used to treat a wide range of infections caused by anaerobic bacteria and protozoa. Patients should be aware of the drug’s side effects, interactions, and precautions to ensure safe and effective use. Consultation with a healthcare provider is essential for proper diagnosis and treatment of infections, as well as determining the appropriate dosage and duration of Metronidazole therapy.

    Reference Links:

    1. – Metronidazole:
    2. MedlinePlus – Metronidazole:
    3. Mayo Clinic – Metronidazole (Oral Route):
    4. Amodis –

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Tanzir Islam Britto

Hello, I'm Dr. Tanzir Islam Britto. As a dedicated physician, I've embarked on my medical journey at Bangabandhu Sheikh Mujib Medical College (BSMMC), previously known as Faridpur Medical College, where I pursued my Bachelor of Medicine and Bachelor of Surgery (MBBS). I completed my degree at Shahabuddin Medical College (SMC). Alongside my medical career, I am an amateur writer and an active social media advocate, where I share insights into health, wellness, and more.

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