Inhaled Corticosteroids: What They Are, How They Work, and What You Need to Know

When you hear inhaled corticosteroids, a type of anti-inflammatory medication delivered directly to the lungs or nasal passages through a spray or inhaler. Also known as steroid inhalers, they’re not the same as the steroids athletes misuse—they’re designed to reduce swelling and mucus in your airways without affecting your whole body. These drugs are the first-line defense for asthma and allergic rhinitis because they target the problem exactly where it happens—no pills, no injections, no unnecessary side effects.

They work by calming down your immune system’s overreaction. In asthma, your airways get swollen and tight. In allergies, your nose runs and feels stuffed up. Mometasone, a common inhaled corticosteroid used in children and adults for long-term asthma and nasal inflammation control, and Flonase, a nasal spray version of fluticasone that reduces congestion and runny nose from allergies are two of the most trusted names. They don’t give you quick relief like a rescue inhaler, but they stop flare-ups before they start. That’s why doctors ask you to use them every day—even when you feel fine.

Parents often worry about using steroids on kids, but pediatric inhaled steroids, low-dose formulations designed specifically for children’s developing airways have been studied for decades. Research shows they don’t stunt growth long-term when used as directed. The real risk? Not treating the condition. Kids with uncontrolled asthma miss school, wake up gasping at night, and end up in the ER. The same goes for adults with chronic nasal issues—constant congestion leads to poor sleep, brain fog, and even sinus infections.

Not everyone needs them. If your symptoms are mild or seasonal, antihistamines or saline rinses might be enough. But if you’re using a rescue inhaler more than twice a week, or your nose stays stuffed up for months, it’s time to talk about inhaled corticosteroids. They’re not magic, but they’re the most effective long-term tool we have. And they’re not one-size-fits-all. Some people respond better to one spray than another. Some need a spacer. Some need to rinse their mouth after use to avoid thrush. These details matter.

The posts below cover everything from how mometasone is dosed for kids to how Flonase stacks up against other nasal sprays. You’ll find real comparisons, safety tips for daily use, and what to watch for if you or your child starts one. No fluff. No marketing. Just what works—and what doesn’t—based on how these drugs are actually used in clinics and homes.