Nebulizers deliver liquid medication as a fine mist you breathe directly into your lungs. The most common liquid placed in a nebulizer is albuterol, a bronchodilator that relaxes the muscles around your airways to relieve wheezing and shortness of breath. But depending on your condition, your nebulizer cup might hold saline solutions, corticosteroids, mucus-thinning agents, or even antibiotics.
Here’s a breakdown of what goes in, what doesn’t, and how to use these medications safely.
Bronchodilators: The Most Common Option
Bronchodilators are by far the most frequently nebulized medications. They work by relaxing the smooth muscle surrounding your airways, letting more air pass through. The two you’ll encounter most often are albuterol (sold under brand names like Ventolin and ProAir) and levalbuterol (Xopenex). Both come as a liquid solution in small, single-use vials. One vial is a typical dose.
Ipratropium is another bronchodilator that works through a different mechanism. It’s often prescribed alongside albuterol for people with COPD or severe asthma flare-ups, and combination vials containing both drugs are available. Bronchodilators are usually the first medication you nebulize in a session, ideally 15 to 30 minutes before other inhaled treatments, so they open your airways and help the next medication reach deeper into your lungs.
Saline Solutions
Plain saline, a mixture of salt and sterile water, is one of the simplest things that goes into a nebulizer. Normal saline (0.9% concentration) is isotonic, meaning it matches the salt level of your body. It’s used to dilute other medications or to moisturize irritated airways on its own.
Hypertonic saline, typically at 3% or occasionally higher concentrations, has a higher salt content than your body’s fluids. That difference draws water into your airways, which thins sticky mucus and makes it easier to cough up. Hypertonic saline is widely used for conditions like cystic fibrosis and bronchiectasis, and it’s sometimes used for infants with bronchiolitis. If you’ve been prescribed hypertonic saline, you’ll usually nebulize a bronchodilator first to prevent any temporary airway tightening the salt solution can cause.
Corticosteroids
Inhaled corticosteroids reduce inflammation and swelling in the airways. The most commonly nebulized version is budesonide, which comes as a suspension you pour into the nebulizer cup. Other corticosteroids available for nebulization include fluticasone propionate, beclomethasone, and flunisolide. These are prescribed for persistent asthma, particularly in young children or older adults who have difficulty using handheld inhalers effectively.
Unlike bronchodilators, which provide quick relief, nebulized corticosteroids are maintenance medications. They work gradually over days to weeks by calming chronic airway inflammation, so skipping doses reduces their effectiveness. A typical nebulizer session with budesonide takes around 5 to 10 minutes.
Mucus-Thinning Medications
Acetylcysteine is a mucolytic, a medication that breaks apart thick, sticky mucus so you can cough it out more easily. It’s used for lung conditions where mucus buildup is a major problem. The nebulized form comes in two concentrations: a 20% solution (dosed at 3 to 5 mL) or a 10% solution (dosed at 6 to 10 mL), typically administered three or four times a day. Acetylcysteine has a strong sulfur smell that some people find unpleasant, and it can trigger airway tightening, so it’s often given alongside a bronchodilator.
Nebulized Antibiotics
For people with cystic fibrosis and chronic lung infections, antibiotics can be delivered directly to the lungs through a nebulizer. Tobramycin and aztreonam are the two inhaled antibiotics with FDA approval, both targeting Pseudomonas aeruginosa, a bacteria that commonly colonizes the lungs in CF. These are used either to wipe out an early infection or as long-term suppressive therapy, often cycled on and off in alternating months. Nebulized antibiotics deliver high drug concentrations right where the infection lives while minimizing the side effects you’d get from taking the same drug intravenously.
One Over-the-Counter Option
Nearly all nebulizer medications require a prescription, with one exception. Asthmanefrin is an over-the-counter liquid containing racepinephrine, a bronchodilator that works similarly to epinephrine. It’s sold specifically for use with a nebulizer and provides temporary relief from mild asthma symptoms like wheezing and shortness of breath. It is not intended for long-term asthma management, severe asthma, or COPD. Albuterol, despite being the most common nebulizer medication, is prescription-only.
What Should Never Go in a Nebulizer
Only sterile, pharmaceutical-grade liquids belong in a nebulizer cup. A few things people sometimes consider using can be genuinely dangerous.
- Essential oils. Lavender, eucalyptus, peppermint, and similar oils release compounds like terpenes, toluene, and benzene when aerosolized. Inhaling these in concentrated doses can damage lung tissue, impair immune cell function, trigger inflammation, and alter mucus production. Even “natural” and “plant-based” oils can compromise your lungs’ ability to fight off infection.
- Tap water. Tap water is not sterile. It can harbor free-living amoebas like Acanthamoeba, which cause infections that are nearly always fatal when they reach the brain. A 2023 CDC case report documented a death linked to using tap water in a medical device at home. If you need to dilute a medication, use only sterile saline or distilled water.
- Herbal extracts or homemade solutions. Anything not specifically manufactured for inhalation can contain particles, preservatives, or contaminants that damage delicate lung tissue.
Unit-Dose Vials vs. Multi-Dose Bottles
Most nebulizer medications come in single-use (unit-dose) vials, small plastic ampules containing one pre-measured treatment. You twist or snap the top off, pour the contents into the nebulizer cup, and discard the vial after use. This format keeps each dose sterile.
Multi-dose bottles are less common but still used in some settings. They contain enough solution for many treatments, and you measure out each dose yourself. The risk with multi-dose bottles is contamination: every time the bottle is opened, bacteria can enter. Studies have found that multi-dose bottles used in clinical settings were sometimes shared across nearly 10 patients on average, creating a real infection risk. If you use a multi-dose bottle at home, keep the tip clean, never touch it to the nebulizer cup, and store it according to the label instructions.
Mixing Medications in the Same Cup
Some nebulizer medications can be combined in a single session to save time. Albuterol and ipratropium are commonly mixed together, and premixed combination vials exist for this reason. Albuterol and budesonide are also generally considered compatible in the same cup.
Not all combinations are safe, though. Certain drugs can chemically interact when mixed, reducing their effectiveness or forming particles that clog the nebulizer. If you’ve been prescribed multiple nebulized medications, your pharmacist can confirm which ones are safe to combine and which need to be run in separate sessions. When in doubt, nebulize each medication individually and rinse the cup between treatments.