Lanvis (thioguanine) is used to treat acute nonlymphocytic leukemia.

Do not take Lanvis (thioguanine) if you are allergic to any ingredient in Lanvis (thioguanine)

Before using Lanvis (thioguanine), tell your health care provider about any of the following: if you are pregnant, planning to become pregnant, or breastfeeding if you are taking any other prescription medicine, nonprescription medicine, herbal preparation, or dietary supplement if you have any other medical condition

How much medicine you take and how often you take it depends on many factors, including the condition being treated and the age and weight of the patient. If you have any questions about the amount and/or frequency of Lanvis (thioguanine) you are taking, talk with your health care provider. Carefully read the information provided with Lanvis (thioguanine). Lanvis (thioguanine) will be given by a qualified health care provider who is experienced with the use of cancer medications. You must be under medical supervision while taking Lanvis (thioguanine). Contact your health care provider at once if you experience any of the following: Fever; sore throat; yellowing of the skin or eyes; vomiting, signs of infection; bleeding from any site; chills. Women of childbearing potential should avoid becoming pregnant while taking Lanvis (thioguanine). Lab tests will be required to monitor therapy. Be sure to keep appointments. Patients with other medical conditions should talk with their health care provider before taking Lanvis (thioguanine). Do not take over-the-counter or prescription medications or dietary supplements without talking with your health care provider. This includes any herbal preparations or dietary supplements.

Store Lanvis (thioguanine) in a dry place between 59 and 77 degrees F.