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Mintezol Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Mintezol (thiabendazole) is an anthelmintic, or anti-worm, medication used to treat infections caused by worms such as threadworm. Mintezol may also be used to treat pinworm (when it occurs with threadworm), hookworm, whipworm, roundworm, and trichinosis. Common side effects include nausea, vomiting, loss of appetite, diarrhea, dizziness, drowsiness, or headache.

The recommended dosage is one 500 mg tablet, twice daily, after meals, or as directed by your doctor. Mintezol may interact with theophylline (Theo-Dur, Theolair, Theochron, Theo-Bid, and Elixophyllin). Tell your doctor all medications you take. Do not drive, use machinery, or do any activity that requires alertness while taking Mintezol. If you are pregnant, only take Mintezol if the potential benefit outweighs the potential risk to the fetus. It is not known if Mintezol is excreted in breast milk. Consult your doctor before breastfeeding.

Our Mintezol (thiabendazole) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Mintezol in Detail - Patient Information: Side Effects

Stop taking thiabendazole and seek emergency medical attention if you experience an allergic reaction (swelling of the lips, tongue, or face; shortness of breath; closing of the throat; or hives).

Rarely, other serious side effects can occur. Stop taking thiabendazole and contact your doctor if you experience

  • seizures;
  • behavior or personality changes;
  • skin rash;
  • vision changes; or
  • yellowing of the skin or eyes.

Other, less serious side effects may be more likely to occur. Continue to take thiabendazole and talk to your doctor if you experience

  • dizziness, drowsiness, or headache;
  • numbness;
  • nausea, vomiting, diarrhea, upset stomach, or decreased appetite;
  • unusual urine odor;
  • fever or chills;
  • ringing in the ears;
  • blurred vision or dryness of the eyes; or
  • appearance of live worms in the mouth or nose.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Mintezol (Thiabendazole) »

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Mintezol FDA Prescribing Information: Side Effects
(Adverse Reactions)


Gastrointestinal: anorexia, nausea, vomiting, diarrhea, epigastric distress, abdominal pain, jaundice, cholestasis, parenchymal liver damage and hepatic failure. (See WARNINGS.)

Central Nervous System: dizziness, weariness, drowsiness, giddiness, headache, numbness, hyperirritability, convulsions, collapse, confusion, depression, floating sensation, weakness and lack of coordination.

Special Senses: tinnitus, abnormal sensation in eyes, xanthopsia, blurred vision, reduced vision, drying of mucous membranes (mouth, eyes, etc.), Sicca syndrome. (See WARNINGS.)

Cardiovascular: hypotension.

Metabolic: hyperglycemia.

Hematologic: transient leukopenia.

Genitourinary: hematuria, enuresis, malodor of the urine, crystalluria.

Hypersensitivity: pruritus, fever, facial flush, chills, conjunctival injection, angioedema, anaphylaxis, skin rashes (including perianal), erythema multiforme (including Stevens-Johnson syndrome), and lymphadenopathy.

Miscellaneous: appearance of live Ascaris in the mouth and nose.

Read the entire FDA prescribing information for Mintezol (Thiabendazole) »


Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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