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Febuxostat lowers uric acid by inhibiting the enzyme xanthine oxidase — the same target as allopurinol, but with a different chemical structure. It is mainly an option when allopurinol is not tolerated, not suitable or not effective enough. According to the SmPC, in people with pre-existing serious cardiovascular disease it should only be used if there is no suitable alternative.
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According to German and European recommendations, allopurinol remains the medicine of first choice for lowering uric acid: long proven, inexpensive and adjustable in small steps.²,³ Febuxostat is the alternative when allopurinol is not tolerated, is not an option or misses the target despite an adequate dose. The word "intolerance", however, covers very different things:
| Situation on allopurinol | What is clarified first | Assessment |
|---|---|---|
| Stomach and bowel complaints, mild rash without general symptoms | Connection, dose, other causes | Switching to febuxostat is a common option |
| Severe hypersensitivity (e.g. Stevens-Johnson syndrome, DRESS) | Exact documentation of the reaction | Never allopurinol again; febuxostat too only with great caution, because severe reactions have been described in people with such a history |
| Target value not reached | Was the dose increased sufficiently? Was it taken regularly? | Allopurinol is often dosed too low; a switch is only justified once the dose has been fully exploited |
| Impaired kidney function | eGFR, other medication | Allopurinol is often possible with an adjusted dose; febuxostat does not need adjusting in mild to moderate impairment |
| History of serious cardiovascular disease | Is there a suitable alternative? | Febuxostat, according to the SmPC, only if there is no alternative |
The uncomfortable question first: was allopurinol ever dosed adequately and taken regularly? Many people stay on a starting dose for years without their uric acid ever being checked. "Allopurinol doesn't work for me" then really means: "Allopurinol was never adjusted to reach the target value." In this situation, switching is not wrong, but it is not essential either.³
After a severe reaction to allopurinol, febuxostat is not automatically safe. The active ingredients are chemically different, yet according to the SmPC, the people with severe reactions to febuxostat included some with a history of hypersensitivity to allopurinol.¹ Starting under careful observation during the first few weeks is then particularly important — as is knowing which skin signs mean stopping immediately.
If neither allopurinol nor febuxostat is an option, there are further possibilities, such as medicines that increase the excretion of uric acid via the kidneys (uricosurics). They have their own limitations, for example with kidney stones or impaired kidney function.² The treatment decision lies with the treating practice, and in complicated cases often together with a rheumatology practice.
| Combination | Consequence | What to do |
|---|---|---|
| Azathioprine, mercaptopurine | Marked build-up, risk of severe damage to the blood count | Avoid the combination; if it cannot be avoided, only with a drastic dose reduction and blood count checks by the specialist practice |
| Theophylline (asthma medicine) | No relevant change at the lower strength; no data for the higher one | If combined, watch for restlessness, a racing heart, nausea |
| Diuretics such as hydrochlorothiazide or furosemide | Raise uric acid and work against the treatment | Do not stop them on your own; keep an eye on uric acid, look at alternatives with the practice |
| Low-dose aspirin | Can raise uric acid slightly | Do not stop it if it is prescribed to protect the heart — the benefit outweighs this |
| Colchicine, naproxen, prednisolone | No relevant interaction; deliberately combined for flare protection or to treat attacks | Pay attention to kidneys, stomach and blood pressure — this concerns the partner, not febuxostat |
| Alcohol | Raises uric acid, can trigger attacks, puts a strain on the liver | Restraint; see medications and alcohol |
Why the azathioprine combination happens so easily: gout is usually treated at the GP practice, while azathioprine is prescribed in gastroenterology, rheumatology or transplant medicine. Each practice only sees its own part. If gout appears for the first time while azathioprine has long been on the plan, the combination can come about without anyone seeing both prescriptions side by side. This is exactly where a complete medication plan and the interaction check of the brite app, which checks all prescriptions together, help — as does the pharmacy you show both prescriptions to.
Uric acid is the one lab value you should know yourself. It shows whether the treatment is reaching its goal — long before the number of attacks does. How to read lab results is explained in understanding blood values.
There is hardly any experience with febuxostat in pregnancy. According to the SmPC, it should not be used during pregnancy or breastfeeding.¹ Gout is rare in women of childbearing age; if lowering uric acid does become an issue, independent advice is worthwhile, for example from Embryotox.⁸
No dose adjustment is intended for mild to moderate impairment. With severe impairment, efficacy and safety have not been fully studied.¹ This is one of the reasons why febuxostat is often chosen in kidney disease — and at the same time a reason to look closely in advanced kidney failure. General rules are set out in the guide medications for kidney and liver disease.
With mild liver impairment, the lower strength is the upper limit; for more severe forms, there are no data. No adjustment is intended in older age. Febuxostat is not licensed for children and adolescents. There is no experience in people who have had an organ transplant — and azathioprine is often involved here anyway.
The second indication is about protection against tumour lysis syndrome: when chemotherapy destroys a very large number of cancer cells at once, a large amount of uric acid is suddenly released, which can damage the kidneys. Febuxostat is then used at the higher strength for a few days. If you already take febuxostat for gout, be sure to tell the treatment team.
No — and that is the most important message of this article. More attacks in the first few months are a known, almost predictable phenomenon: the falling uric acid releases crystals from the deposits, and these fragments inflame the joint. That is unpleasant, but it is a sign that the breakdown has begun. If you stop now, you have suffered through the bad months without ever reaching the good ones. Instead, talk to the practice about flare protection: is it sufficient, is it being taken regularly, does it run for long enough? And have your uric acid measured — if it is in the target range, you are on the right track.
This is exactly the situation the warning applies to. According to the SmPC, febuxostat should be avoided in serious pre-existing cardiovascular disease unless there is no suitable alternative. That does not mean every prescription is wrong: after a severe reaction to allopurinol, or if other medicines are not an option, febuxostat can be the right choice after weighing things up. What matters is that the prescribing practice knows about your heart attack — which is by no means a given when you see different doctors. An up-to-date medication plan with diagnoses closes this gap.
This is a situation in which you should take the initiative yourself: tell both the practice treating your gout and your gastroenterology practice that the two are coming together. Both febuxostat and allopurinol block the breakdown of azathioprine. The combination is not impossible per se, but it requires a coordinated, greatly reduced azathioprine dose and close blood count checks — or a different solution for one of the two conditions. How to keep track of Crohn's disease is covered in the related article.
Usually not. A good value on febuxostat shows that the medicine is working — not that the tendency towards high uric acid has disappeared. Without the tablet, the level usually rises again within weeks, and crystal formation starts all over again. Whether a dose reduction is an option for you after a long attack-free period and dissolved tophi is decided by the practice. General considerations on stopping can be found under stopping medications.
The interaction check reviews all prescriptions together — including those from different practices.
