The most frequent adverse effects of oral Colchicine are those involving the gastrointestinal tract and may be associated with its antimitotic action. Diarrhea, nausea, vomiting, and abdominal pain are often the first signs of toxicity and are usually an indication that Colchicine therapy should be stopped or the dose reduced. Bone marrow depression with agranulocytosis, thrombocytopenia, and aplastic anaemia have occurred on prolonged treatment and local reactions such as thrombophlebitis and neuritis. Extravasation may cause tissue necrosis.
Adverse effects after intravenous administration include cardiac arrhythmias and local reactions such as thrombophlebitis and neuritis.
Seek medical attention immediately at the first sign of any adverse drug reaction.