Diethylcarbamazine Indications, Dosage, Side Effects

Last updated: February 7, 2026Reviewed date: February 7, 2026Reading time: 8 min read
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Diethylcarbamazine Indications/Diethylcarbamazine is an anthelmintic used primarily as the citrate in the treatment of filariasis, particularly infestations with Wucheria bancrofti or Loa loa. Diethylcarbamazine is an anthelmintic drug that does not resemble other antiparasitic compounds. It is a synthetic organic compound which is highly specific...

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Article Summary

Diethylcarbamazine Indications/Diethylcarbamazine is an anthelmintic used primarily as the citrate in the treatment of filariasis, particularly infestations with Wucheria bancrofti or Loa loa. Diethylcarbamazine is an anthelmintic drug that does not resemble other antiparasitic compounds. It is a synthetic organic compound which is highly specific for several parasites and does not contain any toxic metallic elements. Diethylcarbamazine is only found in individuals that have used...

Key Takeaways

  • This article explains Mechanism of Action of Diethylcarbamazine in simple medical language.
  • This article explains Indications of Diethylcarbamazine in simple medical language.
  • This article explains Contraindications of Diethylcarbamazine in simple medical language.
  • This article explains Dosage of Diethylcarbamazine in simple medical language.
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Definition

Diethylcarbamazine Indications/Diethylcarbamazine is an anthelmintic used primarily as the citrate in the treatment of filariasis, particularly infestations with Wucheria bancrofti or Loa loa. Diethylcarbamazine is an anthelmintic drug that does not resemble other antiparasitic compounds. It is a synthetic organic compound which is highly specific for several parasites and does not contain any toxic metallic elements.

Diethylcarbamazine is only found in individuals that have used or taken this drug. It is an anthelmintic used primarily as the citrate in the treatment of filariasis, particularly infestations with Wucheria bancrofti or Loa loa. The mechanism of action of diethylcarbamazine is thought to involve sensitizing the microfilariae to phagocytosis. One study showed that diethylcarbamazine’s activity against Brugia malayi microfilariae is dependent on inducible nitric-oxide synthase and the cyclooxygenase pathway. It confirmed the important role of the arachidonic acid metabolic pathway in diethylcarbamazine’s mechanism of action in vivo and shows that in addition to its effects on the 5-lipoxygenase pathway, it targets the cyclooxygenase pathway and COX-1.

Mechanism of Action of Diethylcarbamazine

The mechanism of action of diethylcarbamazine is thought to involve sensitizing the microfilariae to phagocytosis. One study showed that diethylcarbamazine’s activity against Brugia malayi microfilariae is dependent on inducible nitric-oxide synthase and the cyclooxygenase pathway. It confirmed the important role of the arachidonic acid metabolic pathway in diethylcarbamazine’s mechanism of action in vivo and showed that in addition to its effects on the 5-lipoxygenase pathway, it targets the cyclooxygenase pathway and COX-1.

Indications of Diethylcarbamazine

  • Used for the treatment of certain filarial diseases, including tropical pulmonary allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।" data-rx-term="eosinophil" data-rx-definition="Eosinophil is a white blood cell involved in allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।">eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।" data-rx-term="eosinophilia" data-rx-definition="Eosinophilia means high eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।">eosinophilia, loiasis, and lymphatic filariasis caused by infection with Wuchereria bancrofti, Brugia malayi, or Brugia timori.
  • DEC is indicated for the treatment of individual patients with certain filarial diseases, including lymphatic filariasis caused by infection with Wuchereria bancrofti, Brugia malayi, or Brugia timori; tropical pulmonary allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।" data-rx-term="eosinophil" data-rx-definition="Eosinophil is a white blood cell involved in allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।">eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।" data-rx-term="eosinophilia" data-rx-definition="Eosinophilia means high eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।">eosinophilia; and loiasis.
  • In cases of onchocerciasis, another common filarial parasite, the drug is effective.
  • DEC continues to be the mainstay for treatment of patients with lymphatic filariasis and loiasis. DEC is also used to prevent heartworm in dogs.

Now, the WHO recommends prescribing DEC to patients who are infected with microfilariae of filarial parasites and also to control the transmission of infection in filariasis-endemic areas.

Therapeutic Uses

  • Filaricides; Lipoxygenase Inhibitors
  • Diethylcarbamazine citrate is usually admin by mouth as tablets. It has also been given by intramuscular injection.
  • For mass treatment against microfilariae of Wucereria bancrofti and Wuchereria malayi/ with the objective of reducing microfilaremia to subinfective levels for mosquitoes, the dose is 2 mg/kg, three times daily after meals, for 7 days for treatment directed toward a possible cure, this dosage regimen is carried out for 10 to 30 days. … For practical purposes, an adequate amount seems to be a total dose of about 72 mg/kg of the citrate salt.
  • For treatment against Loa loa microfilariae, a dose of 2 mg kg should be given 3 times daily after meals for 2 to 3 weeks. If repeated courses are required to produce a cure, they should be separated by periods of 3 to 4 weeks.
  • For treatment against Onchocerca volvulus, treatment is effective in removing microfilariae from the skin; however, they usually return after some weeks because the adult worms are not killed. When lesions of the eye are present, the initial dose of diethylcarbamazine should not exceed 0.5 mg/kg. This is given once on the first day and twice on the second. The dose is then increased to 1 mg/kg three times daily for the third day, and therapy is continued up to a total of 14 days with a dose of 2 to 3 mg/kg in two divided doses each day.
  • Diethylcarbamazine can be used effectively to treat infections caused by Wuchereria bancrofti, Wuchereria malayi, Loa loa, and Onchocerca volvulus. In the first three, radical cure can be achieved by either single or multiple courses of treatment. In onchocerciasis, the radical cure is unlikely because the drug fails to kill the adult worms. Control can be achieved by short periodic courses of treatment. The drug has also been used effectively to treat filariasis due to Tetrapetalonema perstans or Tetrapetalonema streptococcal.
  • Diethylcarbamazine is also effective in clearing Ascaris infections, but it has been replaced by other agents for this purpose.
  • Diethylcarbamazine, 3 mg/kg/body wt three times daily for 21 days was used successfully in 21 patients with eye infections due to Toxocara canis or Toxocara cati, which without such diagnosis would have been confused with the presence of retinoblastoma requiring removal of the affected eye. Diethylcarbamazine
  • In patients with eosinophilic lung (tropical allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।" data-rx-term="eosinophil" data-rx-definition="Eosinophil is a white blood cell involved in allergy, parasites, and some inflammation. সহজ বাংলা: অ্যালার্জি/পরজীবী সংক্রমণে জড়িত রক্তকণিকা।">eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।" data-rx-term="eosinophilia" data-rx-definition="Eosinophilia means high eosinophil count, often linked with allergy, parasites, inflammation, or blood disease. সহজ বাংলা: ইওসিনোফিল বেশি হওয়া।">eosinophilia), treatment with diethylcarbamazine causes a rapid disappearance of symptoms. This and the finding of microfilariae in lung biopsies suggests an association between filariasis and certain pulmonary syndromes.

Contraindications of Diethylcarbamazine

  • Lower seizure threshold
  • Eye complications caused by the worm Onchocerca volvulus
  • Kidney disease with a reduction in kidney function
  • Abnormal liver function tests
  • Kidney disease with a reduction in kidney function
  • Diarrhea
  • The high amount of magnesium in the blood
  • Low amount of sodium in the blood
  • Extreme loss of body water
  • Appendicitis
  • Stomach or intestine blockage
  • Seizures
  • Pregnancy
  • Allergies to Diethylcarbamazine

Dosage of Diethylcarbamazine

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

For Bancroft’s filariasis, loiasis, and river blindness

  • Adults – Dose is based on body weight and must be determined by your doctor. The usual dose is 2 to 3 milligrams (mg) per kilogram (kg) (0.9 to 1.3 mg per pound) of body weight three times a day.
  • Children – Use and dose must be determined by your doctor.

For eosinophilic lung

  • Adults – Dose is based on body weight and must be determined by your doctor. The usual dose is 6 mg per kg (2.7 mg per pound) of body weight a day. This is taken for four to seven days.
  • Children -Use and dose must be determined by your doctor.

Side Effects of Diethylcarbamazine

More common

  • Signs of a serious allergic reaction (e.g., abdominal cramps, difficulty breathing, nausea and vomiting, or swelling of the face and throat)
  • Painful and tender glands in the neck, armpits, or groin
  • Skin rash itching and swelling of the face, especially the eyes
  • Fever, itching or skin rash
  • Joint or muscle pain
  • Burning feeling of the skin
  • Dry skin
  •  Itchiness
  • Skin irritation
  • Severe skin irritation
  • Painful and tender glands in neck, armpits, or groin
  • Rapid heartbeat

Less common

Rare

Drug Interactions of Diethylcarbamazine

Diethylcarbamazine may interact with following drugs, supplements, & may change the efficacy of the drug

  • aluminum hydroxide
  • aspirin
  • Butalbital
  • Butabarbital
  • Carvedilol
  • Clozapine
  • Clobetasol
  • Clevidipine
  • Chlorpromazine
  • dextroamphetamine
  • albendazole
  • diphenhydramine
  • Chlorphenoxamine
  • praziquantel
  • prednisone
  • pyrantel
  • quinamide
  • Bisoprolol
  • Betamethasone
  • Vitamin B Complex 100 (multivitamin)
  • Vitamin B12 (cyanocobalamin)
  • Vitamin D3 (cholecalciferol)
  • Alprazolam
  • Cetirizine
  • voriconazole
  • Betaxolol
  • Betamethasone phosphate
  • tacrolimus
  • Deflazacort
  • Desipramine
  • desloratadine
  • dexamethasone
  • Hydrocortisone
  • telaprevir
  • telithromycin
  • temsirolimus
  • nelfinavir
  • nevirapine
  • nilotinib
  • oxcarbazepine
  • posaconazole
  • rufinamide
  • stiripentol
  • escitalopram
  • modafinil
  • saquinavir
  • nefazodone
  • warfarin

Pregnancy Category of Diethylcarbamazine

FDA Pregnancy Category: X

Pregnancy

Treatment of pregnant patients with diethylcarbamazine should be deferred until after delivery. However, problems in humans have not been documented.

Breast-feeding

It is not known whether diethylcarbamazine is distributed into breast milk. However, problems in humans have not been documented. Appropriate studies on the relationship of age to the effects of diethylcarbamazine have not been performed in the pediatric population. However, no pediatrics-specific problems have been documented to date.

References

Diethylcarbamazine Indications, Dosage, Side Effects


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What to tell the doctor

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Questions to ask

  • What is the most likely cause of my symptoms?
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Tests to discuss

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Safe first steps

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OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
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Avoid these mistakes

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Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

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Doctor to discuss: Medicine doctor / pediatrician for children / qualified clinician
Tests to discuss with doctor
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  • Urine test, malaria/dengue tests, chest evaluation, or blood culture only when clinically indicated
Questions to ask
  • What is the most likely cause of my symptoms?
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  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
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Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Diethylcarbamazine Indications, Dosage, Side Effects

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

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Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

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