Qvar Side Effects: Complete Safety Guide
When Do Side Effects Start? How Long Do They Last? Timeline, Contraindications & Food Interactions
Key Takeaways: Qvar Side Effects
- Most common: Oral thrush (white patches in mouth), hoarseness, sore throat – often preventable by rinsing mouth after use.
- Systemic effects: Rare at recommended doses; possible with long‑term high doses (e.g., adrenal suppression, bone thinning, cataracts).
- Onset: Local effects may appear within days to weeks; systemic effects take months to years.
- Duration: Local side effects usually resolve quickly with dose adjustment or improved technique; systemic effects may take weeks to months to reverse.
- Contraindications: Allergy to beclometasone or ingredients, active tuberculosis. Caution in pregnancy/breastfeeding – discuss with your doctor.
Asthma preventer inhalers like Qvar (beclometasone dipropionate) are generally well tolerated, but like all medicines, they can cause side effects. Understanding what to expect, when they might occur, and how to manage them helps you use your treatment safely and confidently.
When to seek immediate medical help
Stop using Qvar and seek urgent medical attention if you experience: wheezing or tightness in the chest immediately after use (paradoxical bronchospasm), swelling of the lips, face, or neck, skin rash or hives (signs of allergic reaction). Use your blue reliever inhaler if breathing is difficult.
What Are Qvar Side Effects?
Side effects with Qvar are usually mild and related to local deposition of the drug in the mouth and throat. Systemic effects are uncommon at standard doses. Based on clinical trials and post‑marketing experience, the following frequencies are reported:
Very common (affecting more than 1 in 10 people)
- Oral thrush (candidiasis): White patches in the mouth or throat, sometimes soreness.
Common (affecting 1 to 10 in 100 people)
- Hoarseness (dysphonia)
- Sore throat (pharyngitis)
Uncommon (affecting 1 to 10 in 1,000 people)
- Rash, nettle rash (urticaria), itching
Rare (affecting 1 to 10 in 10,000 people)
- Nausea (feeling sick)
Very rare (affecting less than 1 in 10,000 people)
- Adrenal gland suppression (causing weakness, tiredness, weight loss, low blood pressure)
- Cushing’s syndrome (weight gain, rounded face, high blood pressure)
- Bone thinning (osteoporosis)
- Glaucoma (increased pressure in the eye)
- Cataract (clouding of the lens)
- Slowing of growth in children and adolescents
- Anxiety, sleep problems, behavioural changes (hyperactivity, irritability – mainly in children)
Frequency not known
- Depression, aggression (more likely in children)
🗒️ Note: Paradoxical bronchospasm (sudden wheezing after inhalation) can occur rarely. If this happens, use your reliever inhaler and contact your doctor immediately.
When Do Qvar Side Effects Start?
The onset of side effects depends on the type:
- Local effects (thrush, hoarseness, sore throat): Can appear within a few days to weeks of starting treatment, especially if the mouth is not rinsed after use. They are more common in people with poor inhaler technique, diabetes, or those using high doses.
- Allergic reactions (rash, itching, swelling): May occur shortly after the first dose or after prolonged use. Immediate hypersensitivity is rare.
- Systemic effects (adrenal suppression, bone thinning, cataracts): Develop only after prolonged use of high doses (typically >800 mcg/day in adults) over many months or years. They are very rare with standard doses.
- Growth slowing in children: May be detected after several months of regular use; it is usually small and reversible if the dose is adjusted.
How Long Do Qvar Side Effects Last?
The duration varies:
- Local effects: Thrush and hoarseness often resolve within a few days of improving inhaler technique, rinsing the mouth, or using antifungal treatment. They may persist if the underlying cause (e.g., poor technique) continues.
- Allergic skin reactions: Usually subside within days of stopping the drug. If mild, they may resolve even with continued use; if severe, medical treatment is needed.
- Systemic effects: Adrenal suppression, if it occurs, can take weeks to months to reverse after dose reduction or discontinuation. Bone density loss may not fully recover. Cataracts and glaucoma may require surgical intervention.
- Growth effects: Catch‑up growth is possible when the dose is reduced to the minimum effective level.
Most side effects are reversible or manageable with simple measures. Regular reviews with your doctor ensure early detection and intervention.
Side Effects Timeline Summary
| Side effect type | Typical onset | Typical duration |
|---|---|---|
| Oral thrush, hoarseness | Days to weeks | Days to weeks (with intervention) |
| Allergic rash/itching | Minutes to days | Days |
| Nausea | Variable | Short‑lived |
| Adrenal suppression | Months to years (high doses) | Weeks to months after dose reduction |
| Cataract/glaucoma | Years | Often permanent without surgery |
| Growth slowing (children) | Months | Reversible with dose adjustment |
Contraindications: Who Should Not Use Qvar?
Qvar is contraindicated in the following situations:
- Hypersensitivity: Allergy to beclometasone dipropionate, propellant HFA‑134a, or ethanol (the small amount of alcohol in the inhaler).
- Active or untreated tuberculosis (TB): Inhaled corticosteroids may worsen TB; treatment for TB must be initiated first.
Use with caution (discuss with your doctor):
- History of TB (treated).
- Recent surgery or trauma.
- Concurrent use of topical corticosteroids (creams, ointments) – systemic absorption may increase.
- Switching from oral steroids (risk of adrenal insufficiency during transition).
- Pregnancy and breastfeeding – see below.
- Severe liver disease (though no dose adjustment is usually needed, monitoring is prudent).
Pregnancy and breastfeeding
Pregnancy: There are limited data on beclometasone use in pregnant women. Inhaled corticosteroids are generally considered safe when the benefit outweighs the risk, as uncontrolled asthma poses greater risks to mother and baby. Your doctor will help you decide.
Breastfeeding: Beclometasone passes into breast milk in negligible amounts. At therapeutic doses, it is not expected to affect the breastfed infant. Discuss with your doctor.
Food Interactions: Does Qvar Interact with Food?
There are no known interactions between Qvar and food. The inhaler delivers the drug directly to the lungs, so food does not affect its absorption or activity. However, Qvar contains a small amount of ethanol (alcohol) – less than 100 mg per dose – which is far below the level that would cause any interaction with food or drinks.
Alcohol: Moderate alcohol consumption is unlikely to cause problems. However, if you have a history of alcohol intolerance or are taking disulfiram (for alcoholism) or metronidazole (an antibiotic), be aware that even tiny amounts of ethanol could theoretically cause a reaction – though this is extremely unlikely with Qvar. Consult your doctor if you are concerned.
Grapefruit juice: Unlike some other corticosteroids (e.g., budesonide), beclometasone is not significantly metabolised by CYP3A4 in the gut, so grapefruit juice does not affect its levels.
🍽️ Practical advice: You can use Qvar with or without food. The most important thing is to rinse your mouth with water after each use – this prevents food particles from mixing with residual drug and increasing the risk of thrush.
Qvar Side Effects FAQs
Can Qvar cause thrush and how can I prevent it?
Yes, oral thrush is a very common side effect. You can prevent it by rinsing your mouth with water and spitting out immediately after each use. Using a spacer (if compatible) and cleaning the mouthpiece also help.
What should I do if I get a sore throat from Qvar?
A sore throat is common but usually mild. Rinse your mouth after each dose. If it persists or is painful, tell your doctor – you may need a lower dose or antifungal treatment if thrush is present.
Can Qvar affect my eyes?
Very rarely, long‑term use of high doses may increase the risk of glaucoma or cataracts. Regular eye checks are recommended if you are on high doses. Report any vision changes to your doctor.
Is Qvar safe for children?
Qvar is licensed for children aged 5 years and older. It can slightly slow growth, so your doctor will prescribe the lowest effective dose and monitor your child’s height regularly. The benefits of asthma control usually outweigh this risk.
Can I drink alcohol while using Qvar?
Yes, moderate alcohol consumption is safe. Qvar contains only a tiny amount of alcohol (less than 100 mg per dose), not enough to cause any noticeable effect or interaction.
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Clinical References & Sources
Medical Content Manager
Nabeel is a co-founder, and medical content manager of Chemist Doctor. He works closely with our medical team to ensure the information is accurate and up-to-date.
Medical Doctor
Dr. Feroz is a GMC-registered doctor and a medical reviewer at Chemist Doctor. He oversees acute condition and urgent care guidance.
Medical Director
Usman is a co-founder, and medical director of Chemist Doctor. He leads the organisation's strategic vision, bridging clinical and operational priorities.
Review Date: 8 March 2026
Next Review: 8 September 2026
Published on: 8 March 2026
Last Updated: 8 March 2026