Adverse reactions in decreasing order of severity are: bone marrow depression, with aplastic anemia, with agranulocytosis or with thrombocytopenia may occur in patients receiving long-term therapy. Peripheral neuritis, purpura, myopathy, loss of hair, and reversible azoospermia have also been reported.
Vomiting, diarrhea, and nausea may occur with colchicine therapy, especially when maximal doses are necessary for a therapeutic effect. To avoid more serious toxicity, the drug should be discontinued when these symptoms appear, regardless of whether or not joint pain has been relieved.
Dermatoses have been reported. Hypersensitivity reactions may occur infrequently.