Advair contains a steroid, but it’s not only a steroid. It’s a combination inhaler with two active ingredients: fluticasone, which is a corticosteroid, and salmeterol, which is a long-acting bronchodilator. The steroid reduces inflammation in your airways while the bronchodilator relaxes the muscles around them, and the two work together to control asthma and COPD symptoms.
What Kind of Steroid Advair Contains
The steroid in Advair is fluticasone propionate, a corticosteroid. Corticosteroids are synthetic versions of cortisol, a hormone your body naturally produces to regulate inflammation. They are not the same as anabolic steroids, which are synthetic forms of testosterone sometimes misused by athletes. Corticosteroids suppress inflammation; anabolic steroids build muscle. The two share the word “steroid” but have completely different effects on your body.
Fluticasone works by reducing the number of inflammatory cells in your airways, including the immune cells that cause swelling, excess mucus, and tightening during asthma flare-ups. It also directly increases the number of receptors on airway smooth muscle that respond to bronchodilators, which means the second ingredient in Advair, salmeterol, works more effectively alongside it.
How the Two Ingredients Work Together
Salmeterol, the non-steroid half of Advair, is a long-acting beta-2 agonist (LABA). It relaxes the smooth muscle lining your airways, opening them wider so air flows more freely. Its molecular structure includes an unusually long side chain that anchors near the receptor, allowing the drug to engage and disengage repeatedly over many hours. That’s what gives it a duration of action long enough to be taken just twice daily rather than every few hours like a rescue inhaler.
The combination matters because neither ingredient alone does both jobs well. Fluticasone controls the underlying inflammation that causes chronic symptoms, while salmeterol provides sustained relief from airway tightness. Salmeterol has mild anti-inflammatory properties on its own, but bronchodilation is its primary role.
How Much Steroid Actually Enters Your Body
One reason inhaled corticosteroids are considered safer than oral steroids is that most of the drug stays in your lungs rather than circulating through your bloodstream. When you inhale fluticasone, any portion you accidentally swallow is almost entirely broken down by your liver before it can reach the rest of your body. The systemic exposure, meaning the amount that actually gets into your bloodstream, is roughly 13 to 21 percent of the inhaled dose depending on your lung function. People with COPD tend to absorb less than healthy individuals.
This localized delivery is what allows Advair to calm airway inflammation without causing the more serious side effects associated with steroid pills or injections taken over long periods.
Available Strengths
Advair comes in two inhaler formats with different strength options. The Diskus (a dry powder inhaler) is available in 100/50, 250/50, and 500/50 microgram strengths. The first number is the fluticasone (steroid) dose, and the second is the salmeterol dose, which stays the same across all three. The HFA version (a metered-dose inhaler) comes in 45/21, 115/21, and 230/21 microgram strengths. Advair Diskus is FDA-approved for asthma in patients aged 4 and older, while COPD treatment with Advair has been studied in adults 40 and older.
Side Effects Linked to the Steroid Component
The most common steroid-related side effect of Advair is oral thrush, a fungal infection in the mouth caused by corticosteroid residue depositing on your tongue, palate, and throat. It typically appears as white patches and can cause soreness or a cottony feeling in your mouth. Hoarseness is another frequent complaint, resulting from the steroid settling on your vocal cords during inhalation.
Both of these are preventable. Rinsing your mouth with water or a baking soda solution after every dose washes away leftover medication before fungi can take hold. Using a spacer device with the HFA inhaler reduces the amount of drug that lands in your mouth and throat, directing more of it into your lungs where it belongs. Basic oral hygiene, brushing at least twice daily with fluoride toothpaste, also helps keep the natural balance of organisms in your mouth intact. If you wear dentures, cleaning and removing them overnight further lowers your risk. Smokers face a higher chance of oral thrush because smoking weakens mucosal immunity and encourages fungal growth.
Long-Term Steroid Effects on Bones
A concern that comes up with any steroid is bone health. The Childhood Asthma Management Program (CAMP) study tracked bone mineral density in children using inhaled corticosteroids over several years. Inhaled corticosteroid use was associated with a small decrease in bone mineral building in boys, though not in girls, and the effect did not appear to depend on dose. Importantly, it did not translate into a higher risk of osteopenia (early bone thinning) or fractures. The fracture rate was about 11 to 12 per 1,000 person-years for both boys and girls, and neither inhaled nor oral corticosteroid use predicted who would fracture first.
Oral corticosteroid courses told a different story. Boys who received five or more courses of oral steroids had about double the osteopenia rate (20.6%) compared to boys who received none (10.2%), and the effect was clearly dose-dependent. This distinction reinforces why inhaled delivery matters: keeping the steroid local to the lungs dramatically limits skeletal impact compared to swallowing a pill that floods your entire system.