Levamisole, sold under the trade name Ergamisol among others, is a medication used to treat parasitic worm infections. Specifically it is used for ascariasis and hookworm infections. It is taken by mouth.
Side effects may include abdominal pain, vomiting, headache, and dizziness. Use is not recommended during breastfeeding or the third trimester of pregnancy. Serious side effects may include an increased risk of infection. It belongs to the antihelmintic class of medications.
Levamisole was discovered in 1966. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. The wholesale cost in the developing world is about 0.18 to 0.33 USD for a course of treatment. It is not commercially available in the United States. Levamisole is also used as a dewormer for livestock.