Diethylcarbamazine (DEC): uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

DEC is the main medicine for lymphatic filariasis in India’s elimination programme. It belongs to the Antiparasitic / anthelmintic group. These treat worm infestations and parasitic infections.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Antiparasitic / anthelmintic
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Lymphatic filariasis (elephantiasis)
Mass drug administration in filariasis elimination programmes
Tropical pulmonary eosinophilia
Some other filarial worm infections

Common brand names

India: Banocide Forte, Hetrazan
Worldwide: Hetrazan

Common side effects

Fever and body aches
Headache
Nausea
Dizziness

Before taking it — precautions

Tell your doctor about pregnancy; it is usually avoided in mass campaigns during pregnancy
Severe reactions can occur in people with onchocerciasis or heavy Loa loa infection
Tell your doctor about heart or kidney disease

When to see a doctor urgently

Swelling of face or throat or trouble breathing (urgent)
High fever, severe headache or confusion
Severe eye pain or change in vision

Not a prescription — no dose shown. The right dose of diethylcarbamazine depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Why do I get fever after taking DEC?

Dying worms can cause a reaction with fever and aches. It usually settles in a day or two.

Why is DEC given to whole communities?

Mass treatment kills the young worms in the blood and stops mosquitoes spreading filariasis.

Does DEC reverse swollen legs?

It treats the infection but does not reverse established swelling. Limb hygiene and care help manage it.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.