Threadworms, Antibiotic Prescribing

Doses are oral and for adults unless otherwise stated. Visit the Health Products Regulatory Board website or the printed Irish Medicines Formulary for drug SPCs, dosage, contraindications, interactions, or IMF/BNF/BNFC/MIMS. See guidance on dosing in children for quick reference dosage/weight guide

Letters indicate strength of evidence range from A+ (systematic review) to D (informal opinion). Statins can interact with some antibiotics and increase the risk of rhabdomyolysis. Amiodarone and drugs which prolong the QT interval can interact with many antibiotics. Many antibiotics increase the risk of bleeding with anticoagulants. Please refer to our Drug Interactions Table for further information.

Comments from Expert Advisory Committee

Treat household contacts. Advise morning shower/baths and hand hygiene. Use piperazine in children under 6 months.


Treatment Dose TX Duration
mebendazole in all >6 mths 100mg stat
OR piperazine/senna sachet 3 mths - 1yr:  2.5ml
1-6 yrs: 5mls
>6yrs: 1 sachet
stat, repeat after 2 weeks

Patient Information

We recommend patients use the website developed by HSE/ICGP/IPU partnership for tips on how to get better from common infections without using antibiotics, what you can do for yourself or a loved one and when to seek help.

The HSE Health A-Z website provides patient information on many hundreds of conditions and treatments.

Reviewed June 2016

antibiotics banner