Lymphatic filariasis is the infection that causes elephantiasis.
The combination is widely used in deworming programmes.
HOW IT WORKS (MECHANISM OF ACTION)
Ivermectin
Parasite nerve and muscle cells have glutamate-gated chloride channels.
Ivermectin binds to those channels and opens them.
Chloride ions flood into the parasite cell.
The cell becomes electrically inactive.
The parasite is paralysed and then dies.
Human nerve cells lack these particular channels.
Ivermectin 24 mg also barely crosses the human blood-brain barrier.
That is why it is selective for the parasite.
Albendazole
Worm cells rely on a protein called beta-tubulin.
Beta-tubulin builds the internal scaffolding of the cell.
Albendazole binds to worm beta-tubulin and blocks it.
The worm can no longer absorb glucose.
It loses its energy supply and dies.
The two drugs attack parasites by different routes.
Each covers species the other covers less well.
Combining them clears more infections in one course.
It also reduces the chance of drug resistance developing.
DOSAGE GUIDE
Patient group
EMA regimen
Duration
15 to under 45 kg, or 105 to 140 cm
Ivermectin 9 mg + albendazole 400 mg
Once daily for 3 days
45 kg or more, or 141 cm or taller
Ivermectin 18 mg + albendazole 400 mg
Once daily for 3 days
Mass drug administration
A single dose at the same bands
One dose, may repeat at 6 months
Children under 5 years
Not approved
–
Children under 15 kg
Not approved
–
Dosing basis
Body weight or height
Whichever the programme uses
Who decides the dose
The prescriber
Never self-adjust
Two separate regimens exist
Individual therapy treats a diagnosed infection.
That course is once daily for three days.
Mass drug administration is a public health programme.
That uses a single dose, repeated annually or six-monthly.
The two are not interchangeable.
Height-based dosing exists for a reason:
In community programmes a height pole is often more practical than weighing scales. Both measures appear in the authorised product information, and either is acceptable.
Paediatric Note:
This combination is not approved below 5 years of age or below 15 kg. Any child’s dose must come from the prescriber and the pack insert.
HOW TO TAKE IT
Take the tablet exactly as your doctor has directed.
Swallow the tablet with water.
Albendazole is better absorbed when taken with food.
A fatty meal improves its absorption further.
Ivermectin absorption is affected by food differently.
Follow the specific instruction on your pack.
Do not drink orange juice with this medicine.
Orange juice reduces how much ivermectin you absorb.
Do not drink grapefruit juice with this medicine.
Grapefruit juice raises albendazole levels.
Complete the full course even if you feel well.
All household members may need treating at the same time.
Wash hands thoroughly and keep fingernails short.
Wash bedding and underwear in hot water.
PRECAUTIONS
Absolute contraindications – do not use
Known allergy to ivermectin or albendazole.
Known allergy to benzimidazole medicines.
Known allergy to any tablet ingredient.
High Loa loa microfilaraemia.
Mass treatment in Loa loa areas without risk measures.
Mass treatment during pregnancy.
Mass treatment in women intending to become pregnant.
Children under 5 years, or under 15 kg.
Pregnancy, contraception and breastfeeding
Albendazole is teratogenic, meaning it can harm a developing baby.
Mass treatment is contraindicated in pregnancy.
Individual treatment is not recommended in pregnancy.
That applies especially during the first trimester.
It may be used only if the clinical need outweighs the risk.
Use effective contraception for one month before treatment.
Continue it throughout the treatment course.
Continue it for one month after treatment ends.
This applies to individual and mass treatment.
Tell your doctor at once if you become pregnant.
Less than 2% of an ivermectin dose reaches breast milk.
In mass treatment, avoid it in the first week after birth.
Discuss breastfeeding with your doctor before treatment.
Severe skin reactions
Severe cutaneous adverse reactions have been documented.
These include Stevens-Johnson syndrome.
They also include toxic epidermal necrolysis.
Both are life-threatening skin conditions.
Early signs are a spreading rash with blisters.
Peeling skin and mouth or eye sores are warning signs.
Fever often accompanies the rash.
Stop the medicine immediately if these appear.
Seek emergency medical care at once.
Do not take this medicine again afterwards.
Liver and blood monitoring
Mild to moderate liver enzyme rises are very common.
Liver function monitoring is advised during individual therapy.
Low white cell counts have been reported uncommonly.
Severe blood disorders are very rare with short courses.
Those include pancytopenia and aplastic anaemia.
An Important Distinction:
Intensive fortnightly blood counts and liver tests are required for the prolonged high-dose albendazole courses used in hydatid disease and neurocysticercosis. A three-day deworming course is not the same thing and does not require that schedule. Do not transfer those monitoring instructions onto this page.
Hidden tapeworm infection in the brain
Some people carry an unsuspected brain tapeworm cyst.
This is called neurocysticercosis.
It is more likely in areas with high pork tapeworm rates.
Treatment can trigger inflammation around a cyst.
That can cause seizures or raised pressure in the skull.
Tell your doctor about any history of seizures.
Report any new severe headache or fit after treatment.
Conditions to disclose to your doctor
Any liver disease or previous hepatitis.
Any blood disorder, or low blood counts.
Any history of seizures or epilepsy.
Asthma, which can worsen during treatment.
A weakened immune system, including HIV infection.
Any time lived in or travelled to Central or West Africa.
Any known eye worm or skin worm infection.
Pregnancy, suspected pregnancy, or breastfeeding.
Whether you are trying to conceive.
All other medicines, including warfarin and anticonvulsants.
Before-use safety checklist
I have a prescription and a confirmed or suspected diagnosis.
I weigh at least 15 kg and am at least 5 years old.
My doctor has told me how many tablets to take.
My doctor has told me how many days to take them.
I have told my doctor about any travel to Africa.
I am not pregnant and not trying to conceive.
I am using effective contraception if relevant.
I have no allergy to benzimidazole medicines.
I know to stop if a severe rash develops.
I will avoid orange and grapefruit juice.
I know my household may need treating too.
SIDE EFFECTS
Very common and common side effects
Frequencies are from the EMA product information for this combination. Very common means more than 1 in 10 people. Common means between 1 in 100 and 1 in 10.
Side effect
Frequency
What to do
Headache
Very common
Usually mild and short-lived
Abdominal pain
Very common
Usually mild; report if severe
Raised liver enzymes
Very common
Monitored by blood test
Dizziness
Common
Sit down until it passes
Vision changes
Common
Report to your doctor
Cough
Common
Usually mild
Diarrhoea
Common
Keep well hydrated
Nausea or vomiting
Common
Report if persistent
Reversible hair loss
Common
Hair regrows after treatment
Acne
Common
Usually settles
Fever
Common
Report if high or persistent
Uncommon side effects
Side effect
Frequency
What to do
Low white cell count (leukopenia)
Uncommon
Blood test; medical review
Anaemia
Uncommon
Blood test; medical review
Hypersensitivity reactions
Uncommon
Stop; medical review
Drowsiness
Uncommon
Avoid driving
Conjunctivitis
Uncommon
Medical review
Asthma worsening
Uncommon
Use reliever; medical review
Hepatitis
Uncommon
Urgent medical review
Itching
Uncommon
Report if widespread
Rare and very rare side effects
Event
Frequency
Required action
Encephalopathy (brain inflammation)
Rare
Emergency care immediately
Bone pain
Rare
Medical review
Protein in the urine
Rare
Medical review
Pancytopenia
Very rare
Emergency medical review
Aplastic anaemia
Very rare
Emergency medical review
Agranulocytosis
Very rare
Emergency medical review
Stevens-Johnson syndrome
Very rare
Stop; emergency care immediately
Toxic epidermal necrolysis
Very rare
Stop; emergency care immediately
On itching and fever after a dose:
In filariasis and similar infections, itching, rash and fever soon after treatment can come from the body reacting to dying parasites rather than from the medicine itself. This is expected, usually mild and short-lived, but severe reactions still need medical review.
DRUG INTERACTIONS – AVOID WITH
Raise ivermectin levels – use with caution
Clarithromycin and other macrolide antibiotics.
Ketoconazole and itraconazole.
Verapamil and diltiazem.
These are CYP3A4 inhibitors.
Grapefruit juice.
Dexamethasone raises the active metabolite by about 56%.
Praziquantel raises it by about 50%.
Cimetidine raises it in bile and cyst fluid.
Orange juice reduces ivermectin absorption.
Phenytoin and carbamazepine lower albendazole metabolite levels.
Phenobarbital has the same effect.
Other interactions
Warfarin: rare reports of a raised INR.
Have your INR checked if you take warfarin.
Theophylline levels may change; monitoring advised.
Alcohol and sedatives may theoretically add to neurotoxicity.
Licensed pharmacist (B.Pharm) with 12+ years in clinical pharmacy and patient care. Reviews every article for evidence-based accuracy before it is published on ACTIZA Store.
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