Pylera for H Pylori: Side Effects, Dosage, Interactions


Generic drug: bismuth subcitrate potassium, metronidazole, and tetracycline hydrochloride

Brand name: Pylera

What is Pylera, and how does it work?

Pylera (bismuth subcitrate potassium, metronidazole, and tetracycline hydrochloride) is a combination of a mineral and two antibiotics used to treat stomach ulcers associated with H pylori infection. Pylera is usually used together with omeprazole (Prilosec).

What are the side effects of Pylera?



Metronidazole has been shown to be carcinogenic in mice and rats. It is
unknown whether metronidazole is associated with carcinogenicity in humans.

Common side effects of Pylera include:

Tell your doctor if you have unlikely but serious side effects of Pylera including:

  • numbness and tingling of arms or legs,
  • discolored teeth,
  • mental/mood changes (such as confusion, anxiety, irritability, depression),
  • difficult or painful swallowing, heartburn,
  • fast or pounding heartbeat,
  • ringing in the ears, or
  • frequent or painful urination.


Pancreatitis is inflammation of an organ in the abdomen called the pancreas.
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What drugs interact with Pylera?


  • Do not administer methoxyflurane to patients taking Pylera. The
    concurrent use of tetracycline hydrochloride, a component of Pylera, with
    methoxyflurane has been reported to result in fatal renal toxicity.


  • Psychotic reactions have been reported in alcoholic patients who are
    using metronidazole, a component of Pylera and disulfiram concurrently.
  • Pylera should not be given to patients who have taken disulfiram within
    the last two weeks.


  • Consumption of alcoholic beverages or administration of other products
    containing propylene glycol during treatment with Pylera and for at least 3
    days afterwards may cause a disulfiram-like reaction (abdominal cramps,
    nausea, vomiting, headaches, and flushing) due to the interaction between
    alcohol or propylene glycol and metronidazole, a component of Pylera.
  • Discontinue alcoholic beverage or other products containing propylene
    glycol during and for at least 3 days after therapy with Pylera.

Oral Contraceptives

  • Concurrent use of Pylera with oral contraceptive may make oral
    contraceptives less effective due to an interaction with the tetracycline
    component of Pylera. Breakthrough bleeding has been reported.
  • Women of child-bearing potential should use a different or additional
    form of contraception while taking Pylera.


  • Pylera may alter the anticoagulant effects of warfarin and other oral
    coumarin anticoagulants.
  • Metronidazole has been reported to potentiate the anticoagulant effect
    of warfarin, and other oral coumarin anticoagulants, resulting in a
    prolongation of prothrombin time.
  • Tetracycline has been shown to depress plasma prothrombin activity.
  • Prothrombin time, International Normalized Ratio (INR), or other
    suitable anticoagulation tests should be closely monitored if Pylera is
    administered concomitantly with warfarin. Patients should also be monitored
    for evidence of bleeding.


  • In patients stabilized on relatively high doses of lithium, short-term use of
    Pylera may cause elevation of serum lithium concentrations and signs of lithium toxicity due to the interaction between metronidazole and lithium.
  • Serum lithium and serum creatinine concentrations should be monitored
    several days after beginning treatment with Pylera to detect any increase
    that may precede clinical symptoms of lithium toxicity.

Antacids, Multivitamins, Or Dairy Products

  • The absorption of Pylera may be reduced if administered with antacids containing aluminium, calcium, or magnesium; preparations containing iron, zinc, or sodium bicarbonate; or milk or dairy products due to the interaction between these products and tetracycline.
  • These products should not be consumed concomitantly with Pylera. However, the clinical significance of reduced tetracycline systemic exposure is unknown as the relative contribution of systemic versus local antimicrobial activity against
    Helicobacter pylori has not been established.


  • Metronidazole has been reported to increase plasma concentrations of busulfan, which can result in an increased risk for serious busulfan toxicity.
  • Do not administer Pylera concomitantly with busulfan unless the benefit outweighs the risk.
  • If no therapeutic alternatives to Pylera are available, and concomitant
    administration with busulfan is medically needed, monitor for busulfan
    toxicity and busulfan plasma concentrations and adjust the busulfan dose

Inhibitors Of CYP450 Liver Enzymes

  • The simultaneous administration of Pylera and drugs that inhibit microsomal liver enzymes, such as cimetidine, may result in a prolonged half-life and decreased plasma clearance of metronidazole.

Inducers Of CYP450 Liver Enzymes

  • The simultaneous administration of Pylera and drugs that induce microsomal liver enzymes, such as phenytoin or phenobarbital, may accelerate the elimination of metronidazole, resulting in reduced plasma concentrations of metronidazole.
  • Impaired clearance of phenytoin has also been reported in this situation. Monitor phenytoin concentrations during treatment with

Is Pylera safe to use while pregnant or breastfeeding?

  • Pylera is contraindicated in women who are pregnant because treatment of Helicobacter pylori infection can be delayed in pregnant women, and the use of drugs of the tetracycline class during the second and third trimester pregnancy can also cause permanent discoloration of the teeth (yellow-gray brown) and possibly inhibit bone development.
  • Two of the individual components of Pylera, tetracycline and metronidazole, are present in human milk at concentrations similar to maternal serum levels.
  • It is not known whether bismuth subcitrate, the third component of
    Pylera is present in human milk.
  • It is not known what effect metronidazole, tetracycline or bismuth has on the breastfed infant or on milk production. Tetracycline binds with calcium in human milk.
  • Data indicate that oral absorption of tetracycline in infants is low due to the calcium binding in human milk.
  • Metronidazole transfers to human milk, and infant serum levels can be close to or comparable to infant therapeutic levels.
  • Because of the potential risk of tumorigenicity shown in animal studies with metronidazole, a woman should pump and discard human milk for the duration of
    Pylera therapy, and for 2 days after therapy ends, and feed her infant stored human milk (collected prior to therapy) or formula.


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Medically Reviewed on 4/6/2021


All sections courtesy of the U.S. Food and Drug Administration

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