Iverheal 12mg cannot be used to prevent all of these infections and is ineffective against adult worms. To prevent the spread of infection, wash your clothes and bedding frequently in hot water and keep all non-washable in a sealed plastic bag for at least 3 days. Trim your nails regularly. People who have been in contact with you should also see a doctor as soon as possible as a precaution. This medicine is generally safe and well tolerated.