Contraindications for Metronidazole

tablets and pills in a woman's hands

Before you take Flagyl

Do not take Flagyl and tell your doctor if:

Flagyl from $0.26
  • You are allergic (hypersensitive) to metronidazole, nitroimidazoles (e.g. tinidazole) or any of the other ingredients in your medicine. Signs of an allergic reaction include a rash, swallowing
    or breathing problems, swelling of your lips, face, throat or tongue. Do not take Flagyl if any of the above apply to you. If you are not sure, talk to your doctor or pharmacist before taking Flagyl.

Take special care with Flagyl and check with your doctor or pharmacist before using your medicine if:

  • You have or have ever had a liver problem.
  • You are having kidney dialysis
  • You have a disease of the nervous system

If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking your medicine. Do this even if they have applied in the past. Cases of severe liver toxicity/acute liver failure, including cases with a fatal outcome, in patients with Cockayne syndrome, have been reported with Flagyl. If you are affected by Cockayne syndrome, your doctor should also monitor your liver function frequently while you are being treated with Flagyl and afterward.

Tell your doctor immediately and stop taking Flagyl if you develop: stomach pain, anorexia, nausea, vomiting, fever, malaise, fatigue, jaundice, dark urine, putty or mastic colored stools or itching.

Taking other medicines

Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines. This includes medicines obtained without a prescription, including herbal medicines. This is because Flagyl can affect the way some other medicines work. Also, some other medicines can affect the way Flagyl works.

In particular, tell your doctor if you are taking any of the following medicines:

  • Medicines used to thin the blood such as warfarin
  • Lithium for mental illness
  • Phenobarbital or phenytoin for epilepsy
  • 5 fluorouracil for cancer
  • Busulfan for leukemia (cancer of the blood cells)
  • Ciclosporin – to prevent the rejection of organs after transplant
  • Disulfiram for alcoholism

If you are not sure, talk to your doctor or pharmacist before taking Flagyl.

Taking Flagyl with food and drink

Do not drink any alcohol while you are taking Flagyl and for 48 hours after finishing your course. Drinking alcohol while using Flagyl might cause unpleasant side effects, such as feeling sick (nausea), being sick (vomiting), stomach pain, hot flushes, very fast or uneven heartbeat (palpitations) and headache.

Pregnancy and breast-feeding

Tell your doctor before using Flagyl if:

  • You are pregnant, might become pregnant or think you may be pregnant. Flagyl should not be taken during pregnancy unless considered absolutely necessary.
  • You are breast-feeding. It is better not to use Flagyl if you are breast-feeding. This is because small amounts may pass into the mother’s milk.

How to take Flagyl

Always take Flagyl exactly as your doctor has told you. It is important to finish a full course of treatment. The length of a course will depend on your needs and the illness being treated.
Check with your doctor or pharmacist if you are not sure.

  • Swallow the tablets whole with a drink of water
  • Do not crush or chew the tablets
  • Take these tablets during or just after a meal
  • The dose of Flagyl will depend on your needs and the illness being treated
  • The length of your treatment will depend on the type of illness you have and how bad it is

The usual dose for adults and children is given below:

To treat bacterial infection

Adults

  • The initial dose is 800mg
  • After 8 hours take another dose of 400mg and repeat this dose every 8 hours

Children

  • Your doctor will work out how much your child should take depending on their weight
  • Repeat the dose every 8 hours
  • If your child is a baby under 8 weeks of age, your doctor will give them one daily dose or two separate doses 12 hourly

To prevent infections from happening after surgery

Adults

  • Start Taking Flagyl Tablets 24 hours before your operation
  • Take 400 mg of Flagyl every 8 hours
  • After the operation, you may be given Flagyl either through a drip into a vein or rectally as a suppository until you are able to take tablets again

Children

  • Give your child Flagyl Tablets 1-2 hours before their operation
  • Your doctor will work out how much your child should take depending on their weight
  • After the operation, your child may be given Flagyl either through a drip into a vein or rectally as a suppository until they are able to take tablets again

Reviews

Cloe Cloe avatar

I have a very negative attitude of taking drugs at all, but if you have already prescribed medications, then I try to choose those without a negative effect on the stomach. I treated trichomoniasis with Flagil. It’s a very unpleasant disease with severe pain during urination. Everything went fine and I did not notice any negative side effects. The most important thing is to exclude alcohol when taking this medication and then everything will go nice and quiet, so the bacteria will be quickly destroyed.

Kate Kate avatar

Have found Gardnerelosis during annual preventive survey. At first I was terribly frightened, but it turned out that it was something like a Dysbiosis. For treatment, the doctor prescribed this drug. Flagyl works fine, but in my case causes burning and nausea. Unpleasant, of course, but you can live with it. The main thing is that the illness has passed. My BFF also prescribed Flagyl for the treatment of ureaplasma. But she had no such side effects. Probably, it is all individual reaction of my body to this medicine. All the same you should consider possibility of occurrence of the given side effects.