What Is Primatene Mist? Uses, Dosage, and What You Need to Know in 2026

Primatene Mist is one of America's most recognized asthma products — it was a household name for decades before a 2011 regulatory withdrawal, and it came back to pharmacy shelves in 2018 with a reformulated version. But what exactly is Primatene Mist, who is it for, and how do you use it correctly?

Here's everything you need to know about Primatene Mist in 2026.

What Is Primatene Mist?

Primatene Mist (epinephrine inhalation aerosol, 0.125 mg per actuation) is an over-the-counter metered-dose inhaler (MDI) approved by the FDA for the temporary relief of mild symptoms of intermittent asthma. It is manufactured by Amphastar Pharmaceuticals and is the only FDA-approved OTC asthma inhaler available in the United States.

The active ingredient is epinephrine — also known as adrenaline — which is a natural hormone produced by the adrenal glands. When inhaled, epinephrine relaxes the muscles surrounding the airways in the lungs, allowing them to open up so you can breathe more easily. The effect typically begins within 5 minutes and provides meaningful symptom relief within 20 minutes.

What Is Primatene Mist Used For?

Primatene Mist is FDA-approved for one specific indication:

Temporary relief of mild symptoms of intermittent asthma in adults and children 12 years and older

Mild, intermittent asthma means symptoms occur infrequently — typically fewer than two days per week and fewer than two nighttime episodes per month. Symptoms include wheezing, tightness in the chest, and shortness of breath.

Primatene Mist is

NOT approved for:

COPD (chronic obstructive pulmonary disease)

Moderate or severe asthma

Acute severe asthma attacks (call 911 for severe attacks)

Children under 12 years of age

Long-term maintenance or controller therapy

A Brief History: Why Was Primatene Mist Off the Market?

The original Primatene Mist was introduced in 1956 and was available for over 50 years. In December 2011, it was withdrawn from the US market because the inhaler used chlorofluorocarbon (CFC) propellants, which were found to deplete the ozone layer. Under the Montreal Protocol, all CFC-containing MDIs were required to be phased out.

Amphastar Pharmaceuticals reformulated Primatene Mist using a hydrofluoroalkane (HFA 134a) propellant — environmentally friendly and consistent with modern MDI standards. The FDA approved the new HFA version on November 7, 2018, after extensive clinical trials involving more than 3,000 participants.

How to Use Primatene Mist Correctly

Proper inhaler technique is important for getting the full dose:

Remove the red cap from the mouthpiece.

Shake the inhaler well, then spray once into the air (before every inhalation — this is critical for proper mixing of the suspension).

Exhale completely.

Place the mouthpiece in your mouth, close your lips around it.

Inhale deeply while pressing down on the top of the canister. Continue the deep breath.

Hold your breath as long as possible, then exhale slowly.

Wait 1 minute. If symptoms are not relieved, repeat steps 2-6 for a second inhalation.

Primatene Mist Dosage

Per dose: 1 to 2 inhalations as needed. Start with 1, wait 1 minute; if not relieved, take a second.

Between doses: Wait at least 4 hours between doses.

Maximum daily dose: No more than 8 inhalations in 24 hours.

Canister size: 160 metered sprays (11.7g) — approximately 10 days of use at maximum dose.

Before You Start: Key Requirements

You must have a physician-confirmed asthma diagnosis before using Primatene Mist.

Do not use if you are taking an MAO inhibitor or have stopped one within the past 14 days.

Consult a doctor if you have heart disease, high blood pressure, diabetes, thyroid disease, or seizure history before using.

Want to understand the science behind how it works? Read: How Does Primatene Mist Work? Mechanism of Action Explained.