Levamisole is used in combination with the intravenous anti-cancer drug 5-FU to treat cancer of the colon after surgery.

Levamisole is taken by mouth in the form of tablets. In colon cancer the usual dose is one 50 mg tablet three times a day for three consecutive days, every other week. 5-FU injections are given every week, and treatment max continues up to one year.

Mild nausea may occur. Some patients may experience stomach pain, dizziness, headache, fatigue and changes in taste or smell. Please report these to the doctor or nurse.

When taken with 5-FU, side effects such as sore mouth and diarrhea, may occur more frequently.