Complete Albendazole Information From Drugs
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Transcript of Complete Albendazole Information From Drugs
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7/31/2019 Complete Albendazole Information From Drugs
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AlbendazolePronunciation: (al-BEN-da-zole)Class: Anthelmintic
Trade Names
Albenza- Tablets 200 mg
Pharmacology
Inhibitory effect on tubulin polymerization, resulting in loss of cytoplasmic microtubules.
Pharmacokinetics
Absorption
Albendazole is poorly absorbed from the GI tract; however, it is rapidly converted to its primary active metabolite,albendazole sulfoxide, prior to reaching systemic circulation. Fatty meals enhance bioavailability, as indicated by up toa 5-fold increase in plasma concentration in albendazole sulfoxide. Albendazole sulfoxide plasma concentrations aredose-dependent. C max is achieved in 2 to 5 h and ranges from 0.46 to 1.58 mcg/mL, when given with a fatty meal.
Distribution
Albendazole sulfoxide is 70% protein bound and widely distributed throughout the body.
Metabolism
After metabolism in the liver to albendazole sulfoxide, it is further metabolized to albendazole sulfone and otheroxidative metabolites.
Elimination
Albendazole sulfoxide elimination half-life is 8 to 12 h. Biliary elimination of albendazole sulfoxide results in biliaryconcentrations similar to plasma concentration. Urinary excretion is a minor elimination pathway (less than 1%).
Special Populations
Renal Function Impairment
Pharmacokinetics have not been studied in patients with renal impairment, but it is unlikely that clearance ofalbendazole and albendazole sulfoxide would be affected, given the negligible renal elimination.
Hepatic Function Impairment
Systemic availability of albendazole sulfoxide is increased in patients with extrahepatic obstruction.
ElderlyData suggest pharmacokinetics are similar to those in younger, healthy subjects.
Children
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Albendazole sulfoxide pharmacokinetics are similar to those observed in adults.
Indications and Usage
Treatment of parenchymal neurocysticercosis due to active lesions caused by larval forms of pork tapeworm, Taeniasolium ; treatment of cystic hydatid disease of the liver, lung, and peritoneum caused by larval forms of dogtapeworm, Echinococcus granulosus .
Unlabeled Uses
For the treatment of single and mixed intestinal nematode infections, including ascariasis, enterobiasis, hookworm,strongyloidiasis, trichuriasis, capillariasis, gnathostomiasis, trichostrongyliasis, tissue nematode infections, cutaneouslarva migrans, toxocariasis, ancylostoma caninum, gongylonemiasis, and trichinosis; in combination with otheranthelmintics in the management of the filarial nematode infection lymphatic filariasis; for microsporidial intestinalinfections in patients with AIDS.
Contraindications
Hypersensitivity to benzimidazole compounds or any component of the product.
Dosage and Administration
Hydatid DiseaseAdults and Children
PO For patients weighing 60 kg or more, 400 mg twice daily with meals for a 28-day cycle followed by a 14-dayalbendazole-free interval, for a total of 3 cycles. For patients weighing less than 60 kg, 15 mg/kg/day in divided dosestwice daily with meals (max, 800 mg/day) for a 28-day cycle followed by a 14-day albendazole-free interval, for atotal of 3 cycles. In the presurgical or postsurgical setting, optimal killing of cyst contents is achieved with 3 coursesof therapy.
NeurocysticercosisAdults and Children
PO For patients weighing 60 kg or more, 400 mg twice daily with meals for 8 to 30 days. For patients weighing lessthan 60 kg, 15 mg/kg/day in divided doses twice daily with meals (max, 800 mg/day) for 8 to 30 days.
General Advice
Albendazole should be taken with food.
If difficulty swallowing the tablets occurs, tablets may be crushed or chewed with a little water.
Patients being treated for neurocysticercosis should receive appropriate steroid and anticonvulsant therapy as
required. Oral or IV corticosteroids should be considered to prevent cerebral hypertensive episodes during the firstweek of treatment.
Storage/Stability
Store between 68and 77F.
Drug Interactions
Cimetidine
In patients with hydatid cyst, albendazole sulfoxide concentrations in bile and cystic fluid may be increased about2-fold; however, plasma levels are unchanged 4 h after dosing.
Dexamethasone
Albendazole C trough at steady state was about 56% higher when coadministered with dexamethasone 8 mg. Monitor
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the patient for albendazole adverse reactions. If an interaction is suspected, adjust the albendazole dose as needed.
Grapefruit juice
Albendazole plasma concentrations may be elevated and the half-life may be shortened, increasing the risk ofadverse reactions. Patients should avoid grapefruit products while taking albendazole.
Praziquantel
Albendazole sulfoxide C max may be elevated about 50%, increasing the risk of adverse reactions. Monitor the patientfor albendazole adverse reactions. If an interaction is suspected, adjust the albendazole dose as needed.
Theophylline
Although theophylline pharmacokinetics are unchanged by albendazole, monitor theophylline plasma concentrationsduring and after albendazole treatment. Adjust the theophylline dose as needed.
Adverse Reactions
CNS
Headache (11%); raised intracranial pressure (2%); dizziness/vertigo, meningeal signs (1%).
Dermatologic
Reversible alopecia (2%); erythema multiforme, Stevens-Johnson syndrome (postmarketing).
GI
Abdominal pain, nausea/vomiting (6%).
Hepatic
Abnormal LFTs (16%); acute liver failure, hepatitis (postmarketing).
Hematologic-Lymphatic
Agranulocytosis, granulocytopenia, leukopenia, pancytopenia, thrombocytopenia (less than 1%); aplastic anemia,bone marrow suppression, neutropenia (postmarketing).
Miscellaneous
Fever (1%); acute renal failure (postmarketing).
Precautions
Monitor
Monitor CBCs and liver function (transaminases) at the beginning of each 28-day cycle of therapy and every 2 wkwhile on therapy. Discontinue therapy if liver enzymes are significantly increased. Treatment can be resumed whenhepatic enzymes have returned to pretreatment levels, but perform lab tests frequently during repeat therapy.
Pregnancy
Category C .
Lactation
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Undetermined.
Children
Experience in children younger than 6 y of age is limited.
Hepatic Function
Patients with abnormal LFTs are at increased risk for hepatotoxicity and bone marrow suppression.
Hematologic effects
May cause occasional (less than 1%) reversible reductions in total white blood cell count. More significant reductions,including agranulocytosis, granulocytopenia, or pancytopenia, have been rarely reported. Rare deaths due togranulocytopenia or pancytopenia have also been reported. Agranulocytosis, aplastic anemia, and bone marrowsuppression have been reported in patients with and without underlying hepatic dysfunction.
Hepatic effects
Mild to moderate elevations of hepatic enzymes may occur; these elevations generally return to normal upon
discontinuation of albendazole. Cases of acute liver failure and hepatitis have also been reported.
Neurologic/Ophthalmic effects
Preexisting neurocysticercosis may also be uncovered in patients treated with albendazole for other conditions.Patients may experience neurological symptoms (eg, seizures, increased IOP) as a result of an inflammatory reactioncaused by death of the parasite within the brain. Cysticercosis may rarely involve the retina. Patients should beexamined for retinal lesions prior to initiation of treatment for neurocysticercosis. If lesions are present, weigh theneed of anticysticercal therapy against the possibility of retinal damage caused by albendazole-induced changes tothe retinal lesion.
Overdosage
Symptoms
No untoward effects have been reported with doses of 16 g or more over 12 h.
Patient Information
Instruct patient to take with food; inform patient that the tablets may be crushed or chewed and swallowed with adrink of water if they are unable to swallow the tablets whole.
Advise women that drug may cause fetal harm and to begin therapy after a negative pregnancy test has beenobtained.
Caution women of childbearing age to avoid becoming pregnant while on this drug or within 1 mo of completingtreatment.
Advise patient to contact health care provider immediately if pregnancy occurs while taking this drug.
Advise patients that routine (every 2 wk) monitoring of CBCs and LFTs will take place during therapy.
Copyright 2009 Wolters Kluwer Health.
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