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Worm and parasite medicines

Niclosamide

Also sold as: Yomesan

Prescription neededWorm and parasite medicines

Comes as:Chewable tablet

Usual adult dose

Worm and parasite medicines

Niclosamide

Also sold as: Yomesan

Prescription neededWorm and parasite medicines

Comes as:Chewable tablet

Usual adult dose

Usual adult dose for tapeworm: 2 g as a single dose, chewed well and swallowed with a little water after a light breakfast. Dwarf tapeworm needs 7 days of treatment as set by your doctor.

Your doctor may give you a different dose. Children's doses depend on weight.

Side effects

Common

nausea
stomach pain
itching

Serious — get help

Stop taking it and see a doctor straight away if you notice:

severe allergic reaction (rare)

Do not take it, or take care, if

Known allergy to niclosamide
Children under 2 years (ask your doctor)
Pork tapeworm with possible cysts elsewhere in the body (see a doctor)

Interactions

No important interactions are listed in our database. Still tell your doctor or pharmacist everything you take.

Pregnancy

Category B

No risk seen in animal studies, but there are few studies in pregnant women. Usually considered safe when needed.

Generic alternatives

Similar medicines your doctor or pharmacist may offer instead.

Praziquantel

Check with my other medicines

Always follow your doctor or pharmacistThis page is general information, not a prescription. Do not start, stop or change a medicine on your own.