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Colchicine

Colchicine

For gout flares where anti-inflammatories are unsafe — at a much lower dose than older regimens used.

Pain & Inflammation

Colchicum, gout tablet

Explained by a GMC-registered GP, not a leaflet

Honest about what we can and cannot prescribe remotely

Side effects given the same weight as benefits

Your NHS records in the room, with your consent

Clinically reviewed by Dr Mohammad Khan · Last reviewed

August 30, 2026

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Sick Notes
Private Prescriptions
Blood Tests
Menopause & HRT
Weight Management
Mental Health
Specialist Referrals

What it is

Colchicine is an anti-inflammatory that works quite differently from NSAIDs and steroids. It interferes with the microtubules that white cells need in order to migrate to the joint, so the inflammatory response to urate crystals is blunted at source.

It is derived from the autumn crocus and has been used for gout for centuries.

The important modern change is the dose. Older regimens used colchicine until diarrhoea developed, which was unpleasant and unnecessary. Current guidance uses much lower doses, which work nearly as well with far fewer side effects.

What it is used for

  • Acute gout flares — particularly where NSAIDs cannot be used, as in kidney disease, heart failure, ulcer history or anticoagulation
  • Prevention of flares when starting allopurinol — because urate-lowering treatment paradoxically triggers attacks in the first months
  • Pericarditis, where it reduces recurrence
  • Familial Mediterranean fever

How to take it

For a flare

500 micrograms two to four times a day, started as early in the attack as possible, until the flare settles — and stopped once it has. Maximum 6mg per course, and no repeat course within three days.

Earlier is much better. Colchicine started within the first 12 to 24 hours works considerably better than colchicine started on day three.

When starting allopurinol

500 micrograms once or twice daily for up to six months, alongside the allopurinol, to prevent the flares that urate-lowering treatment provokes.

Stop at the first sign of diarrhoea

Diarrhoea is the signal that you have had enough, not a side effect to push through. Older practice deliberately dosed to that point; modern practice stops before it.

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Side effects

Common

  • Diarrhoea — the dose-limiting effect. Stop the drug
  • Nausea, vomiting, abdominal pain

Serious, with excessive doses or interactions

  • Bone marrow suppression — low blood counts
  • Muscle damage, particularly alongside a statin
  • Nerve damage with prolonged use
  • Colchicine is genuinely toxic in overdose, and there is no antidote. The gap between an effective dose and a dangerous one is narrower than with most medicines, which is why the maximum matters

Not suitable if

  • You have severe kidney or liver impairment — doses must be substantially reduced or the drug avoided
  • You have a blood disorder with low counts
  • You are pregnant — generally avoided
  • You take clarithromycin, erythromycin or ciclosporin — dangerous interactions

Kidney function is the single most important thing to check before prescribing colchicine, because it is cleared by the kidneys and accumulates when they are impaired.

Interactions and monitoring

  • Clarithromycin and erythromycin — substantially raise colchicine levels; the combination has caused deaths and should be avoided
  • Ciclosporin, ketoconazole, ritonavir, verapamil, diltiazem — raise levels
  • Statins — combined risk of muscle damage
  • Grapefruit juice — raises levels

This interaction list is unusually important because colchicine's therapeutic window is narrow. Always declare every medicine before taking it.

Monitoring

Kidney function before prescribing. Full blood count with prolonged use. Urate level once the flare has settled, to guide long-term prevention.

Can we prescribe this?

Yes, for a gout flare where gout is already an established diagnosis and anti-inflammatories are unsuitable. Gout assesses reasonably well remotely — a rapid onset of severe pain in a single joint, often the base of the big toe, with the joint red, hot and exquisitely tender.

What we will not do is treat that picture as gout without care. A single hot swollen joint can be septic arthritis, which destroys a joint within days and is a surgical emergency. Fever, feeling systemically unwell, or a joint that is difficult to move at all means urgent assessment, not a gout prescription.

We will also raise long-term prevention, because treating flares one at a time while the urate stays high is treating the symptom rather than the disease.

Cost and supply

Colchicine is a generic, though its price in the UK has been unstable in recent years. It generally remains modest.

Because a flare course is short, the cost per attack is low.

Anyone with recurrent gout should have a supply at home — the drug works far better started within hours than after a wait for an appointment, and that is a legitimate reason to hold a rescue supply.

Stopping or switching

Stop it when the flare settles, or at the first sign of diarrhoea. It is not a long-term treatment for gout.

The point that matters most

Treating flares does nothing to prevent the next one. Gout is caused by a high urate level, and the only way to stop attacks is to lower it — with allopurinol or febuxostat, taken every day, long term, to a target urate level.

People are often treated for flare after flare over years without anyone offering urate-lowering treatment. That is a genuine gap in care, and joint damage accumulates in the meantime.

Alternatives for a flare

  • NSAIDs such as naproxen — first-line where safe
  • Prednisolone — a short course, useful where both NSAIDs and colchicine are unsuitable
  • Joint injection, for a single accessible joint

What helps alongside

Rest and ice the joint. Keep taking allopurinol if you are already on it — do not stop it during a flare, which is a common misunderstanding. Reducing alcohol, particularly beer, and sugary drinks helps prevent recurrence.

Common questions

How quickly should I take it?

As soon as the attack starts — within hours, not days. Late colchicine works much less well, which is why having a supply at home is sensible for recurrent gout.

Why has my dose been reduced compared with last time?

Because modern guidance uses much lower doses. The old approach of dosing until diarrhoea was unnecessary and unpleasant.

Should I stop my allopurinol during a flare?

No — keep taking it. Stopping and restarting makes things worse. If you are not on it and you get repeated flares, ask about starting it.

Why did my gout get worse after starting allopurinol?

That is expected in the first months, as urate is mobilised from the joints. It is precisely why colchicine is often prescribed alongside for cover. It is not a reason to stop.

Can I take it with my antibiotic?

Not with clarithromycin or erythromycin — that combination is dangerous. Always mention colchicine when any new medicine is prescribed.

Is it just diet?

No. Diet contributes modestly; genetics and kidney handling of urate matter far more. Gout is not a moral failing and dietary change alone rarely controls it — which is why urate-lowering medication exists.

Dr Mohammad Zubair Khan, GMC-registered private GP and founder of Cheshire Clinics

Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469

Last reviewed

August 30, 2026

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How quickly can I be seen?

Same-day access is usually available, from 6am to 10pm, seven days a week. You choose a time that suits you rather than waiting on hold at 8am.

Will I see the same doctor each time?

Yes. Care is led personally by Dr Mohammad Khan, so you are not passed between clinicians. Continuity is the point of a small practice: someone who knows your history and is listening attentively rather than working through a checklist.

Can you see my NHS records?

Yes, with your consent. We can access your Summary Care Record during the consultation, so your current medications, allergies and significant history are in the room. That means fewer questions you have already answered elsewhere, and safer prescribing.

Are you trying to replace my NHS GP?

No. We are not here to replace GPs, only to support them. Your NHS practice remains responsible for your ongoing care, and with your consent we write to them after the consultation. We are useful when you need to be seen sooner, or want more time than a standard appointment allows.

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How much does it cost?

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What does “treatable online” actually mean?

It means the diagnosis can usually be made from your history and photographs, and that treatment can be arranged safely without examining you. Where a condition is not marked treatable online, it is because examination is the diagnosis — listening to a chest, feeling an abdomen, examining an ear or a joint — or because a procedure or device is needed.

Can you prescribe antibiotics?

Yes, where there is a genuine bacterial infection — cellulitis, impetigo, bacterial urine infections, confirmed strep throat. We will also frequently tell you that you do not need one. Most sore throats, coughs, colds and earaches are viral, and an antibiotic gives you the side effects with none of the benefit.

What if the GP cannot help with what I need?

If your problem turns out to be genuinely outside what we can do remotely, the doctor will tell you straight away, point you to the right service, and refund your fee in full. We would rather do that than fill twenty minutes to justify the charge.

What should I do in an emergency?

Call 999 or go to A&E — do not book an online appointment and do not wait for a reply to an email. For urgent problems that are not emergencies, NHS 111 is available 24 hours a day, online or by phone, and can direct you to the right service.

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