Fluticasone

Fluticasone: Rinse Your Mouth — How to Avoid Thrush and Hoarseness When Inhaling Cortisone

Fluticasone is a potent inhaled cortisone that dampens the inflammation of the airways in asthma on a lasting basis and is added in certain situations in COPD. Because only a small part of each puff reaches the lungs and the rest settles in the mouth and throat, oral thrush and hoarseness are the typical side effects. With rinsing, the right technique and a watchful eye on interactions, they can usually be avoided.

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Fluticasone: inhale every day, rinse every time

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Contents

  1. At a Glance: Technical Data Sheet
  2. How it works: why the mouth gets treated too
  3. Dosing: the lowest effective dose
  4. Using it in everyday life
  5. Side effects: local ones common, systemic ones rare
  6. Rinsing your mouth: avoiding thrush and hoarseness
  7. Interactions: ritonavir and others
  8. Checks and comparison with other cortisone inhalers
  9. Special situations: pregnancy, children, COPD, stopping
  10. Fluticasone experiences: what patients really ask
  11. FAQ: Common questions about fluticasone

1. At a Glance: Technical Data Sheet

PropertyDetails
Active ingredientFluticasone (as fluticasone propionate or fluticasone furoate)
ATC codeR03BA05
Drug classInhaled glucocorticoid (inhaled cortisone, ICS)
Dosage formsDry powder inhalers and metered-dose inhalers; fluticasone propionate also on its own, both forms in fixed combinations with long-acting beta-2 agonists (e.g. salmeterol, formoterol, vilanterol), some additionally with an anticholinergic
Half-lifeFluticasone propionate in the blood about 2.8 hours according to the SmPC; the effect in lung tissue lasts considerably longer (used twice daily; fluticasone furoate once daily)
Maximum daily doseFluticasone propionate in asthma: according to the SmPC, no more than 2 mg per day for adults, and preferably not more than 1 mg long term; children from 4 years usually no more than 400 µg
Onset of effectImprovement in breathing in asthma after 4 to 7 days, full effect after weeks; in COPD assessed after 3 to 6 months
Prescription statusPrescription-only medicine
Notable featureOral thrush very common according to the SmPC, hoarseness common — rinse after every use; strong interaction with ritonavir and cobicistat
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2. How it works: why the mouth gets treated too

Fluticasone is a glucocorticoid, a derivative of the body's own hormone cortisol. In the cells of the airway lining, it binds to cortisone receptors and throttles the production of pro-inflammatory messenger substances. The result: the lining swells less, produces less mucus and reacts less sensitively to triggers such as cold, pollen or exertion. In asthma, inhaled cortisone is therefore the foundation of maintenance treatment.¹,²

Fluticasone is one of the particularly potent inhaled cortisones: microgram for microgram, fluticasone propionate is about twice as potent as budesonide or beclometasone. International dose tables therefore classify daily doses as low, medium and high separately for each drug.³ For you, this means that the microgram figures of different cortisone inhalers cannot be compared directly — and fluticasone propionate and fluticasone furoate are not interchangeable microgram for microgram either.

The key point for side effects is in the SmPC: depending on the device, the technique and any spacer, only about 15 to 20 per cent of the inhaled fluticasone propionate reaches the lungs. The rest settles in the mouth and throat and is largely swallowed.¹ What is swallowed is largely harmless, because the liver breaks it down almost completely before it reaches the circulation — bioavailability via the gut is below one per cent. What stays on the lining of the mouth, throat and larynx, on the other hand, has just as strong an anti-inflammatory effect there as in the lungs. And that has consequences:

  • Weakened local defences: yeasts (Candida), which live harmlessly in many people's mouths, can multiply unchecked — oral thrush develops.
  • Effects on the larynx: cortisone on the vocal cords and the muscles of the larynx can make your voice husky, rough or weak.

So neither of these happens because fluticasone is "too strong", but because it lands in the wrong place. That is why the same strategy helps against both: less in the mouth, more in the lungs — and rinse away the rest. Section 6 covers this in detail.

Not a reliever inhaler. Fluticasone does not work immediately, but over days and weeks. It does not help in an acute attack; for that there is a fast-acting reliever such as salbutamol or — if prescribed accordingly — a combination of cortisone and formoterol.

3. Dosing: the lowest effective dose

The figures below describe what the SmPC states. They are not a dosing instruction — the product and the dose are set by the treating practice.¹

  • Asthma in adults and adolescents aged 16 and over: the starting dose depends on severity and, according to the SmPC, ranges from up to 250 µg twice daily in mild asthma to 1 mg twice daily in severe asthma. The daily dose should not exceed 2 mg; more than 1 mg per day should preferably not be used long term.
  • Children from 4 years: 50 to 200 µg twice daily, although 50 to 100 µg is usually enough; as a rule no more than 400 µg per day.
  • COPD: according to the SmPC, 500 µg twice daily as an add-on to a long-acting bronchodilator — only with the strengths intended for this.
  • Combination products: here the relevant SmPC specifies the strength and the number of puffs. Fluticasone furoate combinations are used once a day.

The basic principle is also in the SmPC: once the disease is under control, the dose is reduced step by step to the lowest amount that still works.¹ This is also the best prevention against thrush and hoarseness, because both are dose-dependent. The German National Disease Management Guideline on asthma provides for regularly checking, after a stable phase, whether a reduction is possible.²

4. Using it in everyday life

The basics of inhaler technique for dry powder inhalers and metered-dose inhalers are explained in the guide inhaling correctly. For fluticasone, four points are particularly important:

  1. Regularly, even without symptoms. Fluticasone works preventively. If you only take it on bad days, you throw the effect away — the SmPC stresses daily use even during symptom-free periods.
  2. Before meals or before brushing your teeth. According to the SmPC, you should inhale before a meal where possible. Eating, drinking and brushing your teeth afterwards remove additional residue.
  3. Rinse straight afterwards. Gargle with water and spit it out — the step that section 6 is all about.
  4. With a metered-dose inhaler, consider a spacer. It reduces the amount that sticks in your mouth and makes coordination easier.

If you forget a puff, it is usually not made up if the next dose is due soon anyway; simply carry on according to plan, never take a double dose. More under missed a medication.

When you need your reliever more often. According to the SmPC, an increasing need for short-acting beta-2 agonists is a sign that asthma control is getting worse. The maintenance treatment then needs to be reviewed — promptly, not at the next routine appointment. Waking at night or a dry cough at night are typical early signs.

Puff, rinse, done — every morning and evening

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5. Side effects: local ones common, systemic ones rare

With inhaled cortisone, it is worth separating two levels: side effects at the site of use are common but easy to manage. Side effects throughout the body, as known from cortisone tablets, are rare at usual doses and occur mainly with high doses over a long period.¹

Side effectFrequency according to the SmPCWhat helps
Thrush in the mouth and throatVery commonRinsing, a spacer, the lowest effective dose; if it occurs, local antifungal treatment
HoarsenessCommonRinse immediately after inhaling, rest your voice, check your technique
BruisingCommonUsually harmless; mention it if it increases noticeably
Pneumonia in COPDCommonKnow the warning signs, review the reason for cortisone regularly
Thrush of the oesophagusRareHave pain on swallowing checked by a doctor
Cushing's symptoms, adrenal insufficiency, growth delay, loss of bone density, cataract and glaucoma, rise in blood sugarVery rareThe lowest effective dose, checks at high doses
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The SmPC also lists anxiety, sleep disorders and behavioural changes as very rare, especially in children, as well as blurred vision, which should be checked by an eye specialist. In COPD, the increased risk of pneumonia with inhaled cortisone is well documented; the European Medicines Agency has confirmed it as a class effect of all inhaled cortisones. Risk factors are smoking, older age, low body weight and severe COPD.¹,⁴,⁵

When you need to act immediately. If your breathlessness gets worse straight after inhaling, this may be a paradoxical narrowing of the airways: take your fast-acting reliever and get medical help straight away. In COPD, fever, chills and increasing breathlessness are a reason for a prompt doctor's appointment, because pneumonia and an exacerbation can look similar. After long-term use of high doses, severe weakness, vomiting, a drop in blood pressure or confusion during a serious infection or injury can point to an adrenal crisis — in that case call 112 (emergency number in Germany) immediately.

6. Rinsing your mouth: avoiding thrush and hoarseness

The SmPC is unusually specific here: the mouth should be rinsed with water immediately after inhaling, inhalation should take place before meals where possible — and, according to the SmPC, hoarseness can also be prevented by rinsing immediately after inhaling.¹ That sounds trivial. In practice, however, it is often forgotten, cut short or done wrongly.

The rinsing routine

  1. Straight away, not at some point. Directly after the last puff — before you put the device down. The longer the powder stays on the lining, the more it acts there.
  2. Rinse and gargle with water. A mouthful of water, swirl it round your mouth, then reach the throat by gargling. Two to three rounds.
  3. Spit it out, do not swallow. That is how the manufacturer's instructions describe it. If you cannot spit when you are out and about, have a drink or eat a little something instead — better than nothing.
  4. Clean your dentures. Candida finds ideal conditions under dentures. Take them out to rinse and clean them thoroughly.
  5. Children with a mask: after inhaling through a spacer with a face mask, also wipe the face, because the drug settles there too; afterwards give the child something to drink.

You do not need special mouthwashes for this — the SmPC simply says water. Nor does it help to inhale less deeply "to spare the mouth": the opposite is true, because more of the drug then stays in the mouth and less reaches the lungs.

Recognising oral thrush

Typical signs are white coatings that can be wiped off on the tongue, palate or inside of the cheeks, often with reddened, sensitive lining underneath. Many people first notice a burning tongue, a taste disorder or sore corners of the mouth. If difficulty swallowing or pain behind the breastbone when swallowing come on top, the oesophagus may be affected — this needs to be checked by a doctor promptly.

Thrush is not a reason to stop the cortisone. According to the SmPC, symptomatic thrush is treated locally with an antifungal while inhalation continues.¹ The antifungal is prescribed by your practice. If you leave out the cortisone on your own instead, you swap an annoying problem for a dangerous one: uncontrolled asthma. Along with the treatment, also ask about the cause — technique, dose, rinsing.

Hoarseness: what helps if rinsing is not enough

According to the SmPC, a husky or rough voice is common on fluticasone. People who use their voice heavily at work often notice it first. The following adjustments are used in practice:

  • Have your technique checked: with a metered-dose inhaler, breathing in too fast is a common reason for a lot of the drug ending up in the throat; a spacer reduces this considerably.
  • Review the dose: if your asthma is stable, reducing to the lowest effective dose can take the strain off your voice.
  • Switch device or drug: some people tolerate a different type of inhaler better. A different inhaled cortisone can also be considered, such as ciclesonide, which is only converted into its active form in the lungs.
  • Rest your voice during phases with an infection or heavy vocal strain, and drink enough throughout the day.

Important: hoarseness that lasts longer than about three weeks should be examined by an ENT specialist — especially in smokers. Not every case of hoarseness on cortisone comes from the cortisone.

7. Interactions: ritonavir and others

Because the liver normally breaks fluticasone down very quickly, clinically relevant interactions are rare. The big exception is drugs that strongly block exactly this breakdown enzyme (CYP3A4).¹

CombinationConsequenceWhat to do
Ritonavir (in HIV treatments and in the COVID-19 medicine nirmatrelvir/ritonavir)Greatly increased fluticasone levels; Cushing's syndrome and suppression of the adrenal cortex describedAvoid according to the SmPC unless the benefit outweighs the risk; be sure to inform the prescribing practice
HIV medicines containing cobicistatIncreased risk of systemic cortisone side effectsAs with ritonavir: consider an alternative, otherwise monitor
Other strong CYP3A4 inhibitors, e.g. itraconazole, ketoconazole, certain macrolide antibioticsA smaller but possible rise in levelsAccording to the SmPC, avoid or watch for cortisone side effects
Beta-2 agonists such as salmeterol or formoterolThe effect on the airways can be increasedAn intended combination, often in one device
Cortisone tablets such as prednisoloneThe total cortisone load adds upWith frequent courses, keep an eye on bones, eyes and blood sugar
AlcoholNo relevant interaction knownNo particular restriction; smoking, on the other hand, makes inhaled cortisone work less well
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The ritonavir combination is the textbook example of an interaction across specialist boundaries: the HIV specialist practice prescribes the antiretroviral therapy, the lung specialist practice the asthma inhaler — and each medicine is well tolerated on its own. Together, however, Cushing's syndrome with a round face, weight gain, muscle weakness and high blood pressure can develop over weeks, even though you are "only" inhaling. The same principle basically also applies to COVID-19 medicines containing ritonavir, even if they are only taken for a few days; whether anything is adjusted then is decided by the prescribing practice. So list all your medicines with every new prescription. The brite interaction check screens your list for exactly these kinds of combinations; background in the guide drug interactions.

8. Checks and comparison with other cortisone inhalers

Which checks make sense

  • Mouth and voice: have your practice ask about thrush, burning and hoarseness at every appointment — and demonstrate your inhaler technique once.
  • Asthma control: symptoms, waking at night, reliever use and, regularly, lung function; when things are stable, the question of a dose reduction.²
  • Children: according to the SmPC, growth is checked regularly during long-term treatment.¹
  • High doses over a long period: eye checks for cataract and glaucoma, a look at the risk of osteoporosis, and blood sugar in diabetes.
  • COPD: regularly check whether the conditions for inhaled cortisone still apply — the German National Disease Management Guideline provides for it only with certain features.⁴

Fluticasone compared

DrugUseNotable feature
BudesonideUsually twice dailyVery well studied, also available as an inhalation solution for children; can be used as a reliever in combination with formoterol
BeclometasoneUsually twice dailyPartly as extra-fine particles; can also be combined with formoterol
Fluticasone propionateTwice dailyVery potent per microgram; available on its own and in combinations
Fluticasone furoateOnce dailyIn fixed combinations; long residence time in lung tissue
CiclesonideUsually once dailyOnly activated in the lungs; sometimes considered for local problems in the mouth and throat
Table scrolls to the right

There is no clear ranking: at equivalent doses, inhaled cortisones work comparably; they differ in device, frequency of use and individual tolerability.³ The best product is often simply the one you inhale reliably and with the right technique. One point of distinction: fluticasone is also available as a nasal spray for allergic rhinitis. That is a separate use with different questions — comparable to mometasone, whose article covers the nasal spray side in detail.

9. Special situations: pregnancy, children, COPD, stopping

Pregnancy and breastfeeding

On the basis of extensive experience, Embryotox considers fluticasone suitable for use in pregnancy, both inhaled and as a nasal spray; there is no evidence of an increased risk of malformations. Budesonide and beclometasone are also regarded there as well-suited alternatives, but switching is not necessary if your asthma is well controlled. According to Embryotox, inhalation is also justifiable during breastfeeding.⁶ The SmPC is worded more cautiously. What matters is this: uncontrolled asthma endangers mother and child more than the inhaled cortisone does — do not stop it on your own; more in the guide medications during pregnancy.

Children

According to the SmPC, fluticasone dry powder inhalers are intended for children from the age of four. In children, particular care is taken to use the lowest effective dose, and growth is checked regularly. A spacer with a mouthpiece or mask improves the dose that reaches the lungs and reduces the amount of drug left in the mouth. Rinsing or having a drink is part of the routine for children too; tips under medications for children.

Surgery, switching from tablets, tuberculosis

If you have inhaled high doses for a long time or have been switched from cortisone tablets to the inhaler, your adrenal function may be reduced. In stressful situations such as surgery, serious infections or accidents, extra cortisone may then be needed, according to the SmPC — tell the treatment team; see medications before surgery. After switching from tablets, allergies such as hay fever or skin rashes that were previously suppressed as well can also reappear. In known pulmonary tuberculosis, accompanying treatment is needed according to the SmPC.¹

Stopping: gradually, not abruptly

According to the SmPC, treatment with inhaled fluticasone propionate should not be stopped abruptly, but tapered off by reducing the dose step by step.¹ Otherwise, in asthma, the inflammation may flare up again, often with a delay of a few weeks. In COPD, on the other hand, a planned discontinuation can make sense if the conditions for cortisone no longer apply — this too is for the practice to manage. More in the guides stopping cortisone and stopping medications.

10. Fluticasone experiences: what patients really ask

"I rinse every time — and I still get thrush."

That happens, because rinsing lowers the risk but does not remove it. Check three things: do you really rinse immediately after the last puff and gargle while doing so, rather than just briefly wetting your mouth? Is a lot of powder getting stuck in your throat because your technique is not optimal? And is the dose perhaps higher than necessary? Dentures, a dry mouth or additional courses of cortisone or antibiotics can also encourage thrush. The infection itself is treated locally while inhalation continues.

"Since I got the new inhaler, I've been hoarse all the time."

Changing device often changes the amount that lands in the throat without you noticing — for example because a dry powder inhaler needs a different kind of breath from your previous spray. Have the new device explained to you again at the pharmacy or practice, rinse consistently and give your voice a few weeks. If it persists, a spacer, a dose adjustment or a different drug are options. If the hoarseness lasts longer than about three weeks, your larynx should be examined.

"I'm afraid of the cortisone side effects people know from tablets."

The worry is understandable, but the amounts are not comparable. Inhaled cortisone works where it is needed, in microgram doses; most of the swallowed portion is broken down immediately in the liver. Systemic effects are very rare at usual doses. On the other hand, anyone who repeatedly needs cortisone tablets because of uncontrolled asthma often ends up with considerably more cortisone over the course of a year. More on this in the cortisone guide.

"I take HIV medicines. Can I inhale fluticasone?"

That depends on which ones. If your treatment contains ritonavir or cobicistat as a booster, the SmPC advises against the combination unless the benefit outweighs the risk, because fluticasone can then build up strongly in the body. Be sure to raise this with both practices. There is often an inhaled cortisone that depends less heavily on this breakdown pathway.

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FAQ: Common questions about fluticasone

Only a small part of each puff reaches the lungs; the rest settles in the mouth and throat. There the cortisone weakens the local defences, so that yeasts can multiply, and it can strain the voice. According to the SmPC, rinsing with water immediately and spitting it out lowers the risk of oral thrush and hoarseness.
Typical signs are white coatings that can be wiped off on the tongue, palate or inside of the cheeks, often with reddened lining underneath. A burning tongue, an altered sense of taste or sore corners of the mouth are also common. Pain on swallowing can indicate that the oesophagus is affected and should be checked by a doctor.
Usually not. According to the SmPC, thrush is treated locally with an antifungal while inhalation continues. Stopping on your own can make your asthma worse. Also discuss technique, dose and your rinsing routine with your practice so that the thrush does not come back.
First, consistent rinsing straight after inhaling and a checked technique, often with a spacer for a metered-dose inhaler. If that does not help, a lower dose when the disease is stable, a different device or a different drug can be considered. Hoarseness that lasts longer than about three weeks should be examined by an ENT specialist.
According to the SmPC, breathing in asthma improves after four to seven days of regular use, and the full effect develops over weeks. In COPD, the benefit is assessed after three to six months. Fluticasone does not help in an acute attack; a fast-acting reliever is intended for that.
Very rarely at usual doses. Most of the swallowed portion is broken down immediately in the liver. Systemic effects such as loss of bone density, cataract or suppression of the adrenal cortex occur mainly with high doses over a long period or together with ritonavir. That is why the lowest effective dose is the aim.
No. According to the SmPC, treatment should not be stopped abruptly but reduced step by step. Otherwise, in asthma, the inflammation can return with a delay of a few weeks, and after long-term use of high doses adrenal function also has to be considered. Plan every reduction with your practice.

Sources

  1. Summary of Product Characteristics (SmPC) for Flutide® Diskus (fluticasone propionate, inhalation powder), as of August 2020, sections 4.1 to 4.9 and 5.2; supplemented by the SmPCs of the metered-dose inhalers and combination products — German source. fachinfo.de
  2. German National Disease Management Guideline (Nationale VersorgungsLeitlinie) on asthma, 5th edition (German Medical Association, National Association of Statutory Health Insurance Physicians, AWMF; AWMF reg. no. nvl-002, 2024) — German source. leitlinien.de
  3. Global Initiative for Asthma (GINA): Global Strategy for Asthma Management and Prevention, 2025 Update — dose tables for inhaled corticosteroids. ginasthma.org
  4. German National Disease Management Guideline (Nationale VersorgungsLeitlinie) on COPD, 2nd edition (AWMF reg. no. nvl-003, 2021; chapter on exacerbations added in 2024) — German source. leitlinien.de
  5. European Medicines Agency (EMA), Pharmacovigilance Risk Assessment Committee (PRAC): review of inhaled corticosteroids in COPD — known risk of pneumonia confirmed (2016). ema.europa.eu
  6. Embryotox, Charité Berlin — German pharmacovigilance and advisory centre for embryonic toxicology: fluticasone in pregnancy and breastfeeding. Accessed 2026. embryotox.de

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Medical disclaimer: This article is for general information and does not replace medical advice, diagnosis or treatment. Do not stop fluticasone abruptly, and do not leave it out on your own because of oral thrush or hoarseness — talk to your practice first. Tell every prescribing practice about all your medicines, especially medicines containing ritonavir or cobicistat. If your breathlessness gets worse after inhaling, in a severe asthma attack or if there are signs of an adrenal crisis, call 112 (emergency number in Germany) immediately. The choice of medicine and the dose are always set individually by the treating practice. Last updated: September 2026.