Yes, Astepro is an antihistamine. Specifically, it’s a nasal spray antihistamine containing the active ingredient azelastine hydrochloride. It works by blocking histamine, the chemical your body releases during an allergic reaction that triggers sneezing, runny nose, and nasal congestion. Astepro was the first nasal antihistamine to receive over-the-counter approval from the FDA, which happened in June 2021.
How Astepro Works
When you encounter an allergen like pollen, dust mites, or pet dander, your immune system releases histamine. Histamine latches onto receptors in your nasal passages, causing them to swell, produce extra mucus, and trigger sneezing. Astepro blocks those receptors directly inside the nose, stopping the allergic response at the site where symptoms happen.
This makes it different from oral antihistamines like loratadine or cetirizine, which travel through your bloodstream to reach nasal tissue. Because Astepro is applied directly where it’s needed, it starts working within 30 minutes of use, which is faster than many oral options and significantly faster than nasal steroid sprays, which can take days of consistent use to reach full effect.
What Astepro Treats
Astepro is approved for both seasonal and perennial allergic rhinitis. Seasonal allergies flare up during specific times of year (spring pollen, fall ragweed), while perennial allergies persist year-round from triggers like dust mites, mold, or animal dander. The OTC version (0.15% strength) is approved for adults and children six years and older.
Children ages 6 to 11 should use one spray in each nostril every 12 hours, with adult supervision. Adults and children 12 and older can use one or two sprays per nostril twice daily for seasonal allergies, or two sprays per nostril once daily. For year-round allergies, the typical dose is two sprays per nostril twice daily. Astepro is not approved for OTC use in children under six.
How It Compares to Nasal Steroid Sprays
Astepro and nasal steroid sprays like Flonase work through completely different mechanisms. Flonase contains a corticosteroid that reduces inflammation in nasal tissue over time, easing congestion and swelling. Astepro blocks histamine directly, which targets sneezing, itching, and runny nose more immediately.
Because of these different approaches, some people use both together. Combining a nasal antihistamine with a nasal steroid gives you two separate mechanisms of action working simultaneously: one reducing the inflammatory response and the other blocking histamine. If one spray alone isn’t controlling your symptoms, adding the other type is a reasonable next step.
Side Effects
The most talked-about side effect of Astepro is a bitter taste. Because the spray is applied inside the nose, some of it can drip down the back of the throat, leaving an unpleasant flavor. This is the complaint that comes up most often among users.
Drowsiness is a concern with any antihistamine, but Astepro causes it at low rates. In clinical trials, only about 1 to 2% of participants using the standard twice-daily dose reported feeling sleepy, which is comparable to placebo in some studies. In a longer-term safety study, drowsiness and fatigue were reported by roughly 3.6% and 4.1% of users, respectively. These rates are well below what older oral antihistamines like diphenhydramine cause, but they’re not zero.
You should avoid alcohol and other sedating medications while using Astepro. The FDA label specifically warns that combining it with alcohol or other central nervous system depressants can worsen drowsiness and reduce alertness. If you take sleep aids, anti-anxiety medications, or other sedating drugs, that interaction is worth keeping in mind.
OTC vs. Prescription Versions
Before 2021, all forms of azelastine nasal spray required a prescription. The FDA’s approval moved the 0.15% strength to OTC status for adults and children six and older, but it was a partial switch. The lower-strength 0.1% version still requires a prescription, as does use of either strength in younger children (the prescription version covers children as young as six months for perennial allergies and two years for seasonal allergies).
If your child is under six and you’re looking for a nasal antihistamine, you’ll need to go through a prescriber. The OTC box will say “do not use” for children under six.