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Albendazole Side Effects

Not all side effects for albendazole may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to albendazole: oral tablet, oral tablet chewable

In addition to its needed effects, some unwanted effects may be caused by albendazole. In the event that any of these side effects do occur, they may require medical attention.

You should check with your doctor immediately if any of these side effects occur when taking albendazole:

Less common
  • Fever
  • Black, tarry stools
  • bleeding gums
  • blood in the urine or stools
  • chest pain
  • chills
  • cough
  • painful or difficult urination
  • pinpoint red spots on the skin
  • shortness of breath
  • sore throat
  • sores, ulcers, or white spots on the lips or in the mouth
  • swollen glands
  • ulcers, sores, or white spots in the mouth
  • unusual bleeding or bruising
  • unusual tiredness or weakness
Incidence not known
  • Blistering, peeling, loosening of the skin
  • blurred vision
  • dark-colored urine
  • diarrhea
  • general feeling of tiredness or weakness
  • headache
  • itching
  • joint or muscle pain
  • light-colored stools
  • red, irritated eyes
  • seizures
  • stomach pain, continuing
  • tightness in the chest
  • vomiting
  • yellow eyes or skin

Some of the side effects that can occur with albendazole may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common
  • Abdominal or stomach pain
Less common
  • Nausea
Less common or rare
  • Dizziness
  • thinning or loss of the hair
Incidence not known
  • Lack or loss of strength

For Healthcare Professionals

Applies to albendazole: compounding powder, oral tablet, oral tablet chewable


The side effects of albendazole differ between hydatid disease and neurocysticercosis. The symptoms were generally mild and resolved without treatment. Treatment was discontinued primarily due to leukopenia (0.7%) or hepatic abnormalities (3.8% in hydatid disease).


Dermatologic side effects have included reversible alopecia (1.6% in hydatid disease; less than 1% in neurocysticercosis). Erythema multiforme and Stevens-Johnson syndrome have been reported during postmarketing experience.[Ref]


Hypersensitivity side effects have included hypersensitivity reactions (including rash and urticaria) in less than 1% of patients.[Ref]


Renal side effects have included acute renal failure during postmarketing experience.[Ref]


Hepatic side effects have included abnormal liver function tests (15.6% in hydatid disease; less than 1% in neurocysticercosis) and hepatotoxicity (greater than or equal to 1%). Hepatic abnormalities, acute liver failure, elevations of hepatic enzymes, and hepatitis have been reported during postmarketing experience.[Ref]


Hematologic side effects have rarely included granulocytopenia, agranulocytosis, pancytopenia, and thrombocytopenia. Leukopenia has been reported in less than 1% of patients. Aplastic anemia, bone marrow suppression, and neutropenia have been reported during postmarketing experience.[Ref]


Gastrointestinal side effects have included abdominal pain (6% in hydatid disease), nausea/vomiting (3.7% in hydatid disease; 6.2% in neurocysticercosis).[Ref]

Nervous system

Nervous system side effects have included headache (1.3% in hydatid disease; 11% in neurocysticercosis), dizziness/vertigo (1.2% in hydatid disease; less than 1% in neurocysticercosis), raised intracranial pressure (1.5% in neurocysticercosis), meningeal signs (1% in neurocysticercosis).[Ref]


Other side effects have included fever (1% in hydatid disease).[Ref]


Ocular side effects have included retinal damage.[Ref]


1. "Product Information. Albenza (albendazole)." SmithKline Beecham, Philadelphia, PA.

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