What is Metronidazole 500mg Used for

Bacterial infections are treated with antibiotics. The following article provides information on the use of metronidazole in human beings as well as in dogs. Read on, to know more about the side effects and dosage of the antibiotic....
Metronidazole is an antibiotic which effectively protects you from health problems caused by anaerobic bacteria and certain parasites. Anaerobic bacteria, the single-celled organism, can grow vigorously even in an environment where very little oxygen is available. They can cause abdominal diseases (like bacterial peritonitis), liver diseases (like liver abscess), and pelvis disorders (like abscess of the ovaries and the fallopian tubes). For instance, Giardia lamblia and amoeba are the common intestinal parasites that can cause abdominal pain and diarrhea in infected individuals. A vaginal parasite known as Trichomonas is responsible for inflammation of the vagina (vaginitis). Metronidazole 500mg tablets help block some of the functions of the bacterial cells and the cell functions of parasites, leading to their death.

Metronidazole Uses

Metronidazole is the generic name of the medicine. In the U.S., medicines containing this antibiotic are available under the brand name Flagyl, Metro, Flagyl IV, Flagyl ER. 500mg tablets of this medicine are commonly used to treat:
  • Parasitic infections including 'Giardia infections' of the small intestine
  • Amoebic liver abscess
  • Amoebic dysentery (severe infection of the colon resulting in bloody diarrhea)
  • Meningitis
  • Skin infection
  • Pneumonia
  • Dental abscess
  • Bacterial vaginosis
  • Abscesses in the pelvis, abdomen and brain caused by susceptible anaerobic bacteria
  • Infection of the colon caused by a bacterium called C. difficile.
  • Crohn's disease
  • Trichomonas vaginalis
  • Carriers of Trichomonas that do not exhibit any symptoms of the infection
  • Pelvic Inflammatory Disease
  • Diverticulitis
  • Helicobacter pylori infection that causes stomach or intestinal ulcers
Availability in Various Forms

Metronidazole tablets are available in various preparations such as 250 mg, 500 mg, 750 mg. Apart from these, 375 mg capsules are also available. Cream and gel have 0.75% and 1% metronidazole, while the lotion contains 0.75%. Injections with 5 mg/ml of metronidazole are sometimes used. Cream or gel containing this antibiotic is used to treat acne rosacea. The vaginal gel is used to treat bacterial vaginosis. For giardia, 250 mg tablets are recommended, three times daily, for 5 days. The following table explains the uses of metronidazole more clearly.

Name of the Disease Metronidazole Dosage
Amoebic dysentery 750 mg orally, daily 3 times for 5 - 10 days
Amoebic liver abscess 500 - 750 mg orally, daily 3 times for 5 - 10 days
Anaerobic infections 7.5 mg/kg orally, every 6 hours, not to exceed 4 grams daily
Bacterial Vaginosis (tablet) 750 mg orally, once daily for 7 days
Bacterial Vaginosis (gel) 0.75% vaginal gel, apply it once or twice daily for 5 days
Clostridium difficile infection 250 - 500 mg orally, daily 4 times for 5 - 10 days / 500 - 750 orally, daily 3 times for 5-10 days
Giardia infection 250 mg orally, daily 3 times for 5 days
Helicobacter pylori infection 800 - 1500 mg orally, daily for several days in combination with other drugs
Pelvic inflammatory disease (PID) 500 mg orally, daily twice for 14 days in combination with other drugs
Trichomoniasis 2g single dose or 1 g twice, for one day
Rosacea gel 0.75 - 1%, apply topically, once daily

Side Effects

Metronidazole should not be taken by pregnant women and nursing moms. Serious side effects of metronidazole include seizures and nerve damage resulting in numbness and tingling sensation in extremities (peripheral neuropathy). Such severe side effects are rarely observed but minor side effects like nausea, headache, loss of appetite, metallic taste, and skin rash can be sometimes experienced by the person. While on metronidazole, alcohol should be strictly avoided. Consumption of this antibiotic along with alcohol can lead to severe side effects like increased heart rate, high blood pressure, seizures, liver cirrhosis, breathing difficulty, headache, digestion problems, etc.

Benefits of Metronidazole 500mg Tablets for Dogs and Cats

You need a prescription from your vet if you want to use metronidazole for dogs and cats. Benefits of this medicine for dogs and cats are:
  • The antibiotic works great for inflammatory bowel disease.
  • It lowers the symptoms of infections, including those caused by Giardia, the intestinal parasite. Such infections often lead to diarrhea.
  • It also works great for periodontal diseases.
This antibiotic treats a wide array of ailments in dogs and cats. Usually, a dose of 3 mg to 23 mg per pound is given to dogs, one to four times a day. The recommended dose of metronidazole for cats is 5 mg to 23 mg per pound, once or twice a day. So if you are thinking of giving this medicine to your dog, then you should first check the weight of your dog and then calculate the dose accordingly. To dogs weighing low, 250 mg can be given to treat bowel infection.

The dose and duration of the treatment may vary according to the specific condition being treated. And remember, you should give metronidazole to your pet, for the entire length of time, prescribed by your veterinarian. Some pets may be allergic to this antibiotic, so check for the allergy before giving the dose. Overdose of the medicine may cause nausea, vomiting, dizziness, loss of balance or coordination, or seizures. So, you are expected to follow the instructions religiously.

Disclaimer: The information presented in this article is meant to provide guidelines and should not be treated as a medical advice. You should consult your doctor for any of the problems mentioned above.
Last Updated: September 2, 2011
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hello do this product have any sulfa or sulfate - Annie [October 13, 2014]
after opening of flazol syraps how long to stay to use - abdullah [September 18, 2014]
does metronidazole tablets three times a day leave your tongue coated - launa [August 10, 2014]
I am very constipated after taking calcium tablets, does this help the bloated cramping in my admonen and loosen my bowels? - linda [July 31, 2014]
This medication makes me very nausous. It says to take with food, but throw the food up. - Marg [July 5, 2014]
how long do you have to wait before you drink alchol after taking this drug - dan [May 3, 2014]
What will happen if I drink a beer while taking this medicine? - Tina [April 21, 2014]
What If drink 1 beer when ytaking this what happens? - Tina [April 21, 2014]
If your Doctor Perscribed this to please contnue on usein it as women it is very important that we take care of our body...
In order for this Medication to work we u have to finish it ALL..Remember its your life you have to protect...
- LOVE [April 20, 2014]
what if u had this infection over a month will the pill cure you forever - lisa [April 17, 2014]
How long does it stay in your system after taking it for 7 days? - Chuck [March 17, 2014]
are these for gout - chris [February 25, 2014]
Hi my dog is diagnose with ameoba and has been taking metronidazole for 6weeks now but is not getting better. He is still having bloody diarrhea. Please help. - Dori [February 21, 2014]
will this med help with sinus infections - don [February 15, 2014]
why is it that when taking these tablets you feel bad? - shandae [February 10, 2014]
Can you use for urinary track infection - Lori A [January 14, 2014]
is it alright to take metronidazole 500 if it has expired... - lizzy [January 1, 2014]
I'm taking this medication and I'm trying to conceive a child is that possible? - India L [December 16, 2013]
Does this medication taken every 8 hrs along with cipro taken 2times daily make u feel real tired and nasuas? - Rosie [December 11, 2013]
This was extremely well written and presented clearly. Thank you for your efforts.. - rickers [December 5, 2013]
Does metronidazole increase blood sugar? - Pete [November 14, 2013]
How long before you see results, I am taking this for Pneumomia - Lisa [September 25, 2013]
does this medication increase blood sugar in diabetics? I am a diabetic and started this medication on 08/25/13...I noticed that after an hr of taking it my blood sugar glucose count was higher - Rose [August 26, 2013]
How would you know if you have this and to go to the dr do you have a fishy smell if you had anyone of these - Chyna [July 25, 2013]
This was a very good ideas for the medicine and thank you. - Alma [July 11, 2013]
Is metronicazol used for pain relief? - J P [April 5, 2013]
I have severe stomach pains after taking this medication.. Please anyone tell me, how long does this side effect last? As ordered by the Doctor,
I've taken 4 500mg pills in one shot and I feel horrible.. This is worrying me..
- ouchygirl [April 2, 2013]
just got diagnosed with pelvic inflamatory disease is this a STD? How can my Husband have it? Can 4pills,of 500 mg 1 each day of Metronidazole get rid of it? - Jay [January 21, 2013]
will this help our dog with muscular control of bowels . - sue h [October 18, 2012]
can you use this for a urinary tract infection? - linda [September 2, 2012]
how much each tablet of metronidazole - imee [August 17, 2012]
So do u usw for an std - Tamekia [July 10, 2012]
what affects would this medication have on an unborn child? - dorothy strange [June 25, 2012]
does my stomach & head should hurt while taking this medicine? - tocarra houston [June 14, 2012]
can mens take this antibiotic - ricky [May 25, 2012]
if i have to take metronidazole after my pap cause the doctor said i had an infection what would be the cause of this infection and is transferable - confused [May 10, 2012]
Can I take this medicin with Tylenol. - Angelina [May 4, 2012]
Is sexual contact the only way trich can be contacted by females? - barbara [April 23, 2012]
are there any safer drugs for ttichomonasis and what are they? - cindy [March 1, 2012]
Can you buy the baterical vaginosis over the counter. - Shelly s [February 22, 2012]
thanks for the help! - tisha m [February 22, 2012]
can it help for the flu - jeannine [February 18, 2012]
is this medical equaly effective for infections in the tonsils and or throat? - Maritza [January 13, 2012]
What is good for throwing up - tina [November 19, 2011]
i dont know - tameshia irvin [September 10, 2011]
how long does it take for the500mg take1 every 15mins to cure you? - tameshia irvin [September 10, 2011]
can metronidazole 500mg twice a day be taken with cipro twice a day? - Anna Abbate [August 6, 2011]
what is triccusmoose - 4JQPGQ [July 18, 2011]
people with cancer can they take this medication. - marisol [June 4, 2011]
can it be a sexual transmitted infection - Brenda [February 16, 2011]
what is giardia? - alicia [February 2, 2011]
Great answers to my questions thank you. - Ann [February 1, 2011]
Clostridium dificile infeccion por favor nesecito que me expliquen sobre esta enfermedad y la causa? - Berenice [January 19, 2011]
I went to dr and he said I had "swimmers" and prescribed this medicine "metronidazol". I still don't know how I got it. What it means? If its contageous? Is by sex? I need more info. Dr. Didn't explain well - Rosa k [January 4, 2011]
This information has been most helpful. Thank you very much for it! - Estol Williams [December 5, 2010]
does taking metronidazole help clear up vaginal order - keisha [October 19, 2010]
This was very helpful thank you . - Gloria [October 13, 2010]
yes,but i dont take it any blood thinner. - Elena Vallejera [October 11, 2010]
very good imformation
- Elena Vallejera [October 11, 2010]
If Metronidazole 500MG Tablet has expired (6/22/10) is it safe to take them now (10/3/10)? - Tamara [October 3, 2010]