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Details with Side Effects
The most frequent and most serious toxicity of CeeNU is delayed myelosuppression. It usually occurs 4 to 6 weeks after drug administration and is dose related. Thrombocytopenia occurs at about 4 weeks postadministration and persists for 1 to 2 weeks. Leukopenia occurs at 5 to 6 weeks after a dose of CeeNU and persists for 1 to 2 weeks. Approximately 65% of patients receiving 130 mg/m² develop white blood counts below 5000 wbc/mm³. Thirty-six percent developed white blood counts below 3000 wbc/mm³. Thrombocytopenia is generally more severe than leukopenia. However, both may be dose-limiting toxicities.
CeeNU may produce cumulative myelosuppression, manifested by more depressed indices or longer duration of suppression after repeated doses.
The occurrence of acute leukemia and bone marrow dysplasias have been reported in patients following long-term nitrosourea therapy.
Anemia also occurs, but is less frequent and less severe than thrombocytopenia or leukopenia.
Pulmonary toxicity characterized by pulmonary infiltrates and/or fibrosis has been reported rarely with CeeNU. Onset of toxicity has occurred after an interval of 6 months or longer from the start of therapy with cumulative doses of CeeNU usually greater than 1100 mg/m². There is 1 report of pulmonary toxicity at a cumulative dose of only 600 mg.
Delayed onset pulmonary fibrosis occurring up to 17 years after treatment has been reported in patients who received related nitrosoureas in childhood and early adolescence (1-16 years) combined with cranial radiotherapy for intracranial tumors. There appeared to be some late reduction of pulmonary function of all long-term survivors. This form of lung fibrosis may be slowly progressive and has resulted in death in some cases. In this long-term study of carmustine, all those initially treated at less than 5 years of age died of delayed pulmonary fibrosis.
Nausea and vomiting may occur 3 to 6 hours after an oral dose and usually last less than 24 hours. Prior administration of antiemetics is effective in diminishing and sometimes preventing this side effect. Nausea and vomiting can also be reduced if CeeNU is administered to fasting patients.
A reversible type of hepatic toxicity, manifested by increased transaminase, alkaline phosphatase, and bilirubin levels, has been reported in a small percentage of patients receiving CeeNU.
Renal abnormalities consisting of progressive azotemia, decrease in kidney size, and renal failure have been reported in patients who received large cumulative doses after prolonged therapy with CeeNU. Kidney damage has also been reported occasionally in patients receiving lower total doses.
Neurological reactions, such as disorientation, lethargy, ataxia, and dysarthria have been noted in some patients receiving CeeNU. However, the relationship to medication in these patients is unclear.
Read the CeeNU (lomustine capsules) Side Effects Center for a complete guide to possible side effects
Additional CeeNU Information
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