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Probe · metronidazole · 3 min read

Is Flagyl 250 mg closed in Cockayne syndrome?

Yes. Flagyl tablets are contraindicated in Cockayne syndrome. Severe, irreversible hepatotoxicity and acute liver failure, including deaths, have been reported after metronidazole was started in that group. Latency from the first dose to signs of liver failure has been as short as two days. This is not a 'start and see' 250 mg pack. Tell the writer the diagnosis before anyone opens the bottle. See the metronidazole vault.

Medically reviewed by Dr. Mateo Ruiz, MD - Clinical pharmacology, Barcelona

Last reviewed

Updated

01Why ordinary liver monitoring is not the answer

Forest-green still life: closed gate over a white blister

Some generic metronidazole labels discuss LFTs around Cockayne use. The Flagyl tablet insert's line is contraindication. Do not open a 250 mg pack as a monitored trial because a blog said 'just check LFTs'.

Severe hepatic impairment from other causes is a different row: Child-Pugh C gets a 50 percent Flagyl dose cut. Cockayne is not that row.

02What to say at the visit that would write 250 mg

Name Cockayne syndrome before the prescription is printed. A covering dentist may not have the genetic diagnosis on the dental chart. Bring it up yourself.

If the infection still needs an anaerobic drug, that choice belongs to the clinician who knows both the organism and the syndrome. It is not a leftover Flagyl decision.

03Which liver facts are not this stop

Child-Pugh A and B raised AUC24 about 54 and 53 percent after 500 mg IV; those groups are monitored, not auto-halved. Child-Pugh C was +114 percent and is halved. None of that rewrites the Cockayne ban.

Darkened urine in about one patient in 100,000 is a metabolite pigment the insert calls clinically unimportant. It is not Cockayne liver failure.

04How fast the liver reports started

Latency from drug start to signs of liver failure has been as short as two days. That is why 'take the first few and wait' is the wrong plan in this diagnosis.

If Cockayne syndrome is on the chart and someone already swallowed metronidazole, that is a same-day clinical call, not a metallic-taste question.

05What the contraindication says

Flagyl tablets are contraindicated in patients with Cockayne syndrome. The adverse-reaction section repeats the liver-failure reports, including fatal outcomes with very rapid onset after systemic metronidazole.

A 250 mg dental course does not get an exception because the milligram is smaller than 500 mg. The stop is the syndrome, not the stamp.

06What this stop is not

It is not the metallic-taste complaint. It is not the three-day alcohol hold. It is not first-trimester trichomoniasis. One diagnosis, one contraindication.

Family members sometimes share leftover antibiotics. Do not hand a Cockayne relative your 250 mg blister. Flagyl is not OTC and this stop is not optional.

Sources

  1. Pfizer FLAGYL (metronidazole) tablets prescribing information, LAB-0162-20.0, revised July 2024.

Checked against the current label and reviewed by Dr. Mateo Ruiz. See Probe, Assay, Glow-check, Seal.

Vault consult

Answers follow the U.S. Flagyl label.

Lena W. Cockayne syndrome on my chart. Dental Flagyl 250 mg for a week?

Vault reply

No. Flagyl tablets are contraindicated. Ask for another plan before anyone fills metronidazole.

Milo T. Can we start 250 mg and check liver tests on day two?

Vault reply

Latency to liver failure has been as short as two days. The Flagyl line is do not give the drug, not a two-day trial.

Nadia F. Is this the same as 'go easy in cirrhosis'?

Vault reply

No. Child-Pugh C halves the Flagyl dose. Cockayne syndrome is a contraindication.

Before you start, stop, or change any medicine, speak with your prescriber or pharmacist - they hold your chart, this vault card does not. Open the vault disclaimer.