Albendazole: Uses, Side Effects & Safety

What it is and what it's used for

Albendazole is a deworming medicine of the anthelmintic group. It is used to treat common intestinal worm infections — including roundworm, hookworm, whipworm, pinworm, and tapeworm infections — which are common in India, especially in children. Doctors also sometimes prescribe it for other parasitic infections, such as certain tapeworm larvae infections, but only under close medical supervision.

It is a prescription medicine in India when used for treatment. It is also widely given through government deworming programmes — for example, schoolchildren receive a free 400 mg tablet on National Deworming Day. Routine self-medication is not advised; a doctor should confirm the need for treatment first.

How it works (simple language)

Albendazole kills worms by attacking their ability to absorb food. Scientists believe the medicine binds to a protein inside the parasite that it needs to take up glucose — its main source of energy. Without glucose, the worms gradually lose energy and die, and are then passed out of the body naturally. Taking it with food, especially a meal containing some fat, helps the body absorb the medicine better.

Dosage forms available in India (general info only)

In India albendazole is commonly available as 400 mg chewable tablets (often given as a single dose for common worm infections) and as a 200 mg/5 ml suspension for children. Well-known Indian brands include Zentel and Bandy, though many pharmacies carry other brands too. How often it is taken — single dose or a longer course — depends on the type of infection and your doctor's decision.

Never decide the dose yourself from this article. Always follow your doctor's prescription or the directions on the pack, and check with your pharmacist if you are unsure — especially for children, where the dose depends on the child's weight and age.

Side effects

Common: Stomach pain or cramps, nausea, vomiting, headache, dizziness, and sometimes temporary hair thinning or itching. These are usually mild and short-lived.

Serious — seek medical care: Signs of a severe allergic reaction such as rash, swelling of the face or lips, or difficulty breathing; yellowing of the skin or eyes, dark urine, or unusual tiredness (possible liver problems, mainly with prolonged or high-dose use); severe or blistering skin rash; worsening headache, seizures, vision changes, or vomiting during treatment of certain parasitic infections (these can signal a reaction to dying parasites — seek emergency care); unusual bruising or bleeding.

Precautions and warnings

• Pregnancy: Avoid albendazole in pregnancy, especially in the first three months, unless a doctor decides the benefit clearly outweighs the risk; women who could become pregnant should discuss this with their doctor before taking it.
• Breastfeeding: Small amounts may pass into breast milk — consult your doctor before use if you are breastfeeding.
• Liver disease: Tell your doctor if you have any liver problem, because the medicine is processed by the liver and long-term use can affect it; your doctor may order blood tests during longer courses.
• Young children: It is generally not recommended for routine deworming in very young children (under 1–2 years); always follow a doctor's or paediatrician's advice for this age group.
• Take with food: Take the medicine with food as directed — a fatty meal improves absorption; chewable tablets should be chewed well.
• Other family members: Worm infections spread easily within a household, so a doctor may recommend treating close contacts too — ask your doctor rather than sharing your medicine.
• Re-testing: If symptoms return or do not improve, do not simply repeat the dose — see your doctor, as a different medicine or longer course may be needed.

Interactions (general)

Certain medicines — including dexamethasone (a steroid), praziquantel (another antiparasitic), and cimetidine — can raise the levels of albendazole in the blood, which may increase the risk of side effects; your doctor will take this into account when prescribing. There is no major specific interaction with alcohol, but it is sensible to limit alcohol during treatment. Always tell your doctor about ALL medicines you take, including herbal and ayurvedic products.

Pregnancy and breastfeeding (general guidance)

Albendazole is generally avoided during pregnancy, especially in the first trimester, because animal studies suggest it could harm the unborn child — though human data is limited. It should be used in pregnancy only if a doctor judges it clearly necessary. Small amounts pass into breast milk, so breastfeeding mothers should consult their doctor first. Never self-medicate during pregnancy or breastfeeding — always consult your doctor first.

Storage

Store at room temperature, away from moisture and direct sunlight. Keep the medicine in its original pack and out of the reach and sight of children. Do not use tablets after the expiry date printed on the pack, and return unused or expired medicines to a pharmacy for safe disposal.

When to see a doctor

See a doctor if: your symptoms (stomach pain, visible worms in stool, itching, poor appetite, poor weight gain in children) do not improve or return after treatment; you develop a rash, swelling, breathing difficulty, yellowing of the skin or eyes, or severe headache; you have any liver disease, are pregnant or may become pregnant, or the patient is a very young child. Seek emergency care immediately for signs of a severe allergic reaction, seizures, or sudden vision changes during treatment.

FAQs

1. Do I need a prescription to buy albendazole for deworming?

For treating a diagnosed worm infection, you should see a doctor first, who will advise the right medicine and schedule. Separately, the government's deworming programme gives a free 400 mg tablet to schoolchildren (usually aged 1–19 years) on National Deworming Day, without a personal prescription.

2. How often should deworming be done?

Health programmes in India commonly recommend deworming once or twice a year for children in areas where worm infections are common. For adults, deworming is usually done only when a doctor advises it after diagnosis — do not take it on a fixed schedule on your own.

3. Can a pregnant woman take albendazole?

It is generally avoided in pregnancy, especially in the first three months, and should be taken only if a doctor decides the benefit clearly outweighs the risk. If you are pregnant or planning a pregnancy, tell your doctor before taking any deworming medicine.

4. Should the whole family take deworming tablets together?

Worm infections spread easily through a household, so doctors often recommend treating all close family members at the same time to prevent reinfection. Ask your doctor — do not share your prescribed medicine with others.