Colchicine is an alkaloid chemically described as (S)N- (5,6,7,9-tetrahydro- 1,2,3, 10-tetramethoxy-9-oxobenzo [alpha] heptalen-7-yl) acetamide with a molecular formula of C 22 H 25 NO 6 and a molecular weight of 399.4. The structural formula of colchicine is given below. Colchicine occurs as a pale yellow powder that is soluble in water. COLCRYS (colchicine, USP) tablets are supplied for oral administration as purple, film-coated, capsule-shaped tablets (0.1575" × 0.3030"), debossed with "AR 374"...

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COLCRYS (colchicine, USP) is an alkaloid indicated for: Prophylaxis and treatment of gout flares in adults. Familial Mediterranean fever (FMF) in adults and children 4 years or older. 1.1 Gout Flares COLCRYS (colchicine, USP) tablets are indicated for prophylaxis and the treatment of acute gout flares. Prophylaxis of Gout Flares: COLCRYS is indicated for prophylaxis of gout flares. Treatment of Gout Flares: COLCRYS tablets are indicated for treatment of acute gout flares when taken at the first sign...

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The long-term use of colchicine is established for FMF and the prophylaxis of gout flares, but the safety and efficacy of repeat treatment for gout flares has not been evaluated. The dosing regimens for COLCRYS are different for each indication and must be individualized. The recommended dosage of COLCRYS depends on the patient's age, renal function, hepatic function and use of coadministered drugs . COLCRYS tablets are administered orally without regard to meals. COLCRYS is not an analgesic medica...

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Patients with renal or hepatic impairment should not be given COLCRYS in conjunction with P-gp or strong CYP3A4 inhibitors (this includes all protease inhibitors except fosamprenavir). In these patients, life-threatening and fatal colchicine toxicity has been reported with colchicine taken in therapeutic doses. Patients with renal or hepatic impairment should not be given COLCRYS in conjunction with P-gp or strong CYP3A4 inhibitors. In these patients, life-threatening and fatal colchicine toxicity ...

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The exact dose of colchicine that produces significant toxicity is unknown. Fatalities have occurred after ingestion of a dose as low as 7 mg over a four day period, while other patients have survived after ingesting more than 60 mg. A review of 150 patients who overdosed on colchicine found that those who ingested less than 0.5 mg/kg survived and tended to have milder toxicities such as gastrointestinal symptoms, whereas those who took 0.5 to 0.8 mg/kg had more severe reactions such as myelosupp...

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Fatal overdoses have been reported with colchicine in adults and children. Keep COLCRYS out of the reach of children ( 5.1 , 10 ). Blood dyscrasias: myelosuppression, leukopenia, granulocytopenia, thrombocytopenia and aplastic anemia have been reported. Monitor for toxicity and if present consider temporary interruption or discontinuation of colchicine ( 5.2 , 5.3 , 5.4 , 6 , 10 ). Drug interaction P-gp and/or CYP3A4 inhibitors: Coadministration of colchicine with P-gp and/or strong CYP3A4 inhibitor...

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COLCRYS (colchicine) is a substrate of the efflux transporter P-glycoprotein (P-gp). Of the cytochrome P450 enzymes tested, CYP3A4 was mainly involved in the metabolism of colchicine. If COLCRYS is administered with drugs that inhibit P-gp, most of which also inhibit CYP3A4, increased concentrations of colchicine are likely. Fatal drug interactions have been reported. Physicians should ensure that patients are suitable candidates for treatment with COLCRYS and remain alert for signs and symptoms of ...

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Available data from published literature on colchicine use in pregnancy over several decades have not identified any drug associated risks for major birth defects, miscarriage, or adverse maternal or fetal outcomes . Colchicine crosses the human placenta. Although animal reproductive and developmental studies were not conducted with COLCRYS (colchicine), published animal reproduction and development studies indicate that colchicine causes embryofetal toxicity, teratogenicity and altered postnatal ...

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