Allopurinol and Colchicine on the NCLEX
Gout drugs: acute attack vs prophylaxis roles, why timing matters, and the toxicity signs for each.
Two gout drugs, two different jobs. Mixing up which drug treats the attack and which prevents the next one is the whole trap.
The role split
Acute flare: NSAIDs, colchicine, or steroids. Prevention: allopurinol (a xanthine oxidase inhibitor that lowers uric acid production). Allopurinol does nothing for the attack in front of you and, started fresh mid-flare, can make it worse by shifting urate stores.
Allopurinol timing rules
Start it after the acute flare settles, often with colchicine or NSAID cover for the first months, because early urate shifts can trigger flares. The counterintuitive tested rule: a patient already taking allopurinol keeps taking it during a flare. Stopping and restarting causes the very urate swings that provoke attacks.
Allopurinol toxicity
Any rash means stop the drug and call the provider: it can herald Stevens-Johnson syndrome and the allopurinol hypersensitivity syndrome (fever, rash, hepatic and renal injury). Monitor LFTs and renal function; dose is renally adjusted. Teach 2-3 liters of fluid a day to keep urate moving out.
Colchicine: acute, early, short
Works best started within 24-36 hours of flare onset. It calms the neutrophil response to urate crystals; it does not lower uric acid at all. Low-dose regimens replaced the old dose-until-sick approach.
Colchicine toxicity
GI symptoms are the early warning: diarrhea, nausea, vomiting mean stop the drug. Narrow therapeutic window, and overdose is a true poisoning with bone marrow suppression and multi-organ failure. Renal or hepatic impairment and interacting drugs (clarithromycin, some statins) raise the risk. Report muscle pain or weakness.
Frequently asked
Patient with a red, hot, exquisitely tender great toe. Which drug?
An acute-attack drug: NSAID, colchicine, or a steroid. Not new allopurinol.
Should a patient on allopurinol stop it when a flare starts?
No. Continue it. Stopping causes urate swings that prolong or provoke flares.
First sign of colchicine toxicity?
GI: diarrhea, nausea, vomiting. Teach the patient to stop the drug and call.
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