A medicine to reduce excess androgens in congenital adrenal hyperplasia
Crinecerfont
A specialist medicine used with steroids to reduce excess androgens in congenital adrenal hyperplasia.
What is Crinecerfont?
Crinecerfont is a specialist medicine used to help manage congenital adrenal hyperplasia (CAH), an inherited condition affecting the adrenal glands. It works by blocking the corticotrophin-releasing factor type 1 (CRF1) receptor, which reduces the signal that drives the adrenal glands to make too many male-type hormones (androgens). It is used alongside steroid (glucocorticoid) treatment and can allow lower steroid doses to be used. It is taken by mouth. A very important safety point is that the steroid must never be stopped suddenly, as this can cause a dangerous adrenal crisis. Common side effects include tiredness and headache.
Education and reference only. This is a plain-language guide to Crinecerfont — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Crinecerfont is a specialist medicine used to help control congenital adrenal hyperplasia (CAH), an inherited condition in which the adrenal glands cannot make their hormones normally. In CAH, the body tries to compensate by overdriving the adrenal glands, which leads to too many male-type hormones (androgens). Crinecerfont is taken by mouth and is used together with steroid replacement treatment. Its role is to reduce the excess androgens and, in doing so, to help people use lower steroid doses than they might otherwise need. It is prescribed and supervised by a specialist hormone (endocrine) team.
How it works
In congenital adrenal hyperplasia, the brain sends a strong signal, through a hormone pathway involving corticotrophin-releasing factor (CRF), telling the adrenal glands to work harder. Because the glands cannot make their hormones properly, this extra drive leads to a build-up of male-type hormones (androgens) instead. Crinecerfont blocks the CRF1 receptor, turning down that signal, so the adrenal glands are pushed less hard and make fewer excess androgens. By easing this overdrive, it can help control the condition and allow steroid doses to be lowered, which reduces the long-term effects of high steroid use.
Company & origin
Originated / developed by: Specialist manufacturer.
A specialist medicine used in the UK to help control congenital adrenal hyperplasia, used alongside steroid treatment to reduce excess male-type hormones.
Practical use
How to take Crinecerfont
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it by mouth exactly as advised, usually with food, alongside your steroid treatment.
- Never stop your steroid suddenly; only change steroid doses gradually under your specialist team's guidance.
- Keep following your sick-day rules and emergency steroid plan, including using extra steroid when unwell.
- Attend your hormone blood tests so your team can fine-tune your treatment.
- Tell your team about troublesome tiredness, headache or any new symptoms.
Weighing it up
Advantages & disadvantages of Crinecerfont
Advantages
- Helps reduce excess male-type hormones (androgens) in congenital adrenal hyperplasia.
- May allow lower steroid doses to be used, reducing the effects of long-term high-dose steroids.
- Taken by mouth alongside existing steroid treatment.
Disadvantages
- Does not replace steroid treatment, which must be continued and never stopped suddenly.
- Can cause tiredness and headache.
- Needs specialist supervision with regular hormone monitoring.
Practical use
Good to know
The single most important safety point with crinecerfont is that it does not replace your steroid treatment: your steroid (glucocorticoid) must never be stopped suddenly, because doing so can trigger a life-threatening adrenal crisis. Any dose changes are made gradually and only under your specialist team's guidance, and you should keep your usual sick-day rules and emergency steroid plan. Common everyday side effects include tiredness and headache, which often settle. The benefit of crinecerfont is that, by reducing excess androgens, it may allow your steroid dose to be lowered over time, which can reduce the unwanted effects of long-term high-dose steroids. It is taken by mouth, usually with food, and your team will monitor your hormone levels to fine-tune both this medicine and your steroid.
Who should not take it / use with caution
- People who have had a serious allergic reaction to crinecerfont should not take it.
- It is not a replacement for steroid treatment and must not be used as one.
- It should only be used under a specialist hormone (endocrine) team, with regular monitoring.
- Use in pregnancy and breastfeeding is decided by the specialist team, weighing benefits and risks.
Monitoring
- Regular blood tests to check hormone levels and guide both this medicine and steroid doses.
- Reviewing steroid treatment to see whether the dose can be safely lowered over time.
- Watching for side effects and making sure sick-day and emergency steroid plans are understood.
Side effects
- Tiredness or fatigue.
- Headache.
- Dizziness or stomach upset in some people.
- Effects related to changing steroid needs, which is why steroid doses are adjusted carefully and monitored.
Key interactions
- It is used carefully alongside steroid treatment, with doses adjusted under specialist guidance.
- Some other medicines can affect how it is broken down, so tell your team about everything you take.
- Tell your team about over-the-counter and herbal products, as these can also interact.
Available as: Capsules or an oral liquid taken by mouth.
Answers
Crinecerfont: frequently asked questions
What is crinecerfont used for?
It is a specialist medicine used to help manage congenital adrenal hyperplasia by reducing excess male-type hormones (androgens), used alongside steroid treatment.
Does it replace my steroids?
No. It is used together with steroid treatment, which must be continued; it may, however, allow your steroid dose to be lowered under specialist guidance.
Why must I not stop my steroid suddenly?
Stopping a steroid suddenly can cause a life-threatening adrenal crisis, so steroid doses are only changed gradually and under your specialist team's guidance.
How does it work?
It blocks the CRF1 receptor, turning down the signal that overdrives the adrenal glands, so they make fewer excess androgens.
What are the common side effects?
Common side effects include tiredness and headache, which often settle; tell your team about anything troublesome or new.
Authoritative sources
- BNF
- NICE CKS
Building a medicines information resource?
We create evidence-led, dose-free drug and formulary references for teams.