Yes, Qvar is a steroid. Specifically, it’s an inhaled corticosteroid containing the active ingredient beclomethasone dipropionate, a synthetic compound chemically related to dexamethasone. It works by preventing cells in your airways from releasing substances that trigger asthma symptoms like swelling, mucus production, and tightening of the breathing passages.
What Kind of Steroid Qvar Is
Qvar belongs to a class of medications called corticosteroids, which mimic cortisol, a hormone your body naturally produces to regulate inflammation. This is completely different from anabolic steroids, the type associated with bodybuilding and sports doping. Inhaled corticosteroids like Qvar do not cause muscle enlargement or the physical changes linked to anabolic steroid use. The two share the word “steroid” but have different chemical structures and act on different systems in your body.
Corticosteroids used for asthma calm the immune response in your airways. When your lungs are chronically inflamed, the tissue swells, narrows, and produces excess mucus. Qvar reduces that inflammation over time, making your airways less reactive to triggers like allergens, cold air, or exercise. It’s a maintenance medication, not a rescue inhaler. You won’t feel immediate relief from a single dose. The benefit builds over days to weeks of consistent use.
How It Stays Mostly in Your Lungs
One of the biggest concerns people have about taking a steroid is what it does to the rest of their body. Qvar is designed to deliver medication directly to the lungs, which limits how much enters your bloodstream. The FDA notes that Qvar at recommended doses supplies less than normal physiological amounts of corticosteroid systemically. In practical terms, this means your body gets far less steroid exposure than it would from a pill like prednisone.
That said, some absorption does occur. After inhaling a 320 mcg dose, the active metabolite reaches a peak blood concentration within about 40 minutes. At recommended doses, this amount is small enough that studies show a favorable ratio between local anti-inflammatory activity in the lungs and systemic steroid effects elsewhere. The risk of body-wide steroid side effects rises mainly when doses exceed recommendations or when someone is particularly sensitive.
Side Effects Tied to Steroid Activity
Because Qvar delivers a corticosteroid to your mouth and throat on the way to your lungs, the most common steroid-related side effect is oral thrush, a yeast infection in the mouth. In clinical trials of adults and adolescents, oral thrush occurred in about 3% of patients at a 320 mcg daily dose and 7% at a 640 mcg daily dose, compared to less than 1% with placebo. Throat pain affected up to 4% of patients at higher doses. Rinsing your mouth with water after each use significantly reduces both of these risks.
In children ages 4 to 11, sore throat (pharyngitis) was the most notable side effect, appearing in about 3% of patients across all dose levels compared to 1.6% on placebo. Oral thrush was less common in kids but still occurred in 1% to 3% of pediatric patients.
Long-Term Use in Children
Growth is a specific concern with any steroid used in children. Inhaled corticosteroids at high doses over prolonged periods can slow growth velocity in children and adolescents. A 12-month study of 520 pediatric patients found that Qvar at 100 to 200 micrograms per day had a comparable effect on growth to older formulations of the same drug at double the dose (200 to 400 micrograms per day), suggesting the newer formulation is more efficient at lower amounts. The lowest dose that affects growth has not been definitively established, which is why pediatric prescribing typically aims for the minimum effective dose.
How Qvar Differs From Oral Steroids
If you’ve ever taken prednisone or methylprednisolone for a bad asthma flare, you’ve experienced systemic corticosteroids. Those pills send the drug throughout your entire body, which is why they can cause weight gain, mood changes, blood sugar spikes, and bone thinning when used repeatedly. Qvar avoids most of those problems by concentrating the medication in the airways.
One important nuance: if you’re switching from an oral steroid to Qvar, your body needs time to adjust. Long-term oral steroid use suppresses your adrenal glands, which produce cortisol on their own. Qvar doesn’t replace that full systemic supply. Stopping oral steroids too quickly during a transition can cause adrenal insufficiency, a potentially dangerous condition where your body can’t produce enough cortisol to handle physical stress. This transition is always done gradually under medical supervision.
The Qvar RediHaler Device
Qvar currently comes as the RediHaler, a breath-actuated inhaler available in 40 mcg and 80 mcg per puff strengths. Unlike traditional metered-dose inhalers, you don’t need to coordinate pressing a canister while breathing in. The device releases medication automatically when you inhale through the mouthpiece. You also don’t need to shake or prime it before use. One tradeoff: you cannot use a spacer with the RediHaler, which means the mouth-rinsing step after each dose becomes especially important for preventing thrush.