Generic Name: racepinephrine (RAYSE ep i NEF rin)
Brand Name: Asthmanefrin, S2 Inhalant
What is Asthmanefrin (racepinephrine)?
Racepinephrine is a bronchodilator. It works by relaxing muscles in the airways to improve breathing.
Racepinephrine is used to relieve occasional symptoms of asthma, such as wheezing, chest tightness, and feeling short of breath.
Racepinephrine may also be used for purposes not listed in this medication guide.
What is the most important information I should know about Asthmanefrin (racepinephrine)?
Do not use racepinephrine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.
What should I discuss with my healthcare provider before using Asthmanefrin (racepinephrine)?
Do not use this medicine unless you have asthma that has been confirmed by a doctor.
You should not use racepinephrine if you are allergic to it.
Do not use racepinephrine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.
Ask a doctor or pharmacist if it is safe for you to use this medicine if you have other medical conditions, especially:
high blood pressure;
a thyroid disorder;
mental illness or an emotional disorder;
seizures or epilepsy;
narrow-angle glaucoma; or
an enlarged prostate and urination problems.
It is not known whether racepinephrine will harm an unborn baby. Do not use this medicine without a doctor's advice if you are pregnant.
It is not known whether racepinephrine passes into breast milk or if it could harm a nursing baby. Do not use this medicine without a doctor's advice if you are breast-feeding a baby.
Do not give this medicine to a child younger than 4 years old without medical advice.
How should I use Asthmanefrin (racepinephrine)?
Use exactly as directed on the label, or as prescribed by your doctor. Do not take more than the recommended dose. Using too much racepinephrine or using it too often can increase your risk of heart attack or stroke, which can cause death.
Racepinephrine is a liquid solution that must be placed into a hand-held bulb nebulizer. You will inhale the medicine from the nebulizer.
Any child using racepinephrine should be supervised by an adult while using this medicine.
After using racepinephrine, your symptoms should improve within 20 minutes.
Call your doctor right away if your symptoms do not improve within 20 minutes, or if they get worse after using racepinephrine.
Asthma is usually treated with a combination of drugs. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedule without your doctor's advice.
Seek medical attention if you think your medications are not working as well.
Signs that your asthma symptoms may be getting worse include:
having to use more than 12 inhalations of racepinephrine in a 24-hour period;
having to use more than 9 inhalations in 24 hours for 3 or more days in 1 week; or
having more than 2 asthma attacks in 1 week.
Store at room temperature away from moisture, heat, and light. Do not freeze.
Do not use racepinephrine if it looks brown or cloudy. Throw it out and get a new supply of racepinephrine.
What happens if I miss a dose?
Since racepinephrine is used when needed, you may not be on a dosing schedule. If you are on a schedule, use the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not use extra medicine to make up the missed dose.
Do not use more than 12 inhalations of racepinephrine in a 24-hour period.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while using Asthmanefrin (racepinephrine)?
Avoid getting this medicine in your eyes.
Avoid eating or drinking products that contain caffeine, such as coffee, tea, soft drinks, or energy drinks. Taking caffeine while you are using racepinephrine can increase your blood pressure.
Asthmanefrin (racepinephrine) side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
new or worsening asthma symptoms;
fast heart rate, tremors or a nervous feeling;
sleep problems (insomnia);
a seizure (convulsions); or
dangerously high blood pressure--severe headache, blurred vision, pounding in your neck or ears, nosebleed, anxiety, confusion, severe chest pain, shortness of breath, irregular heartbeats.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Asthmanefrin (racepinephrine)?
Tell your doctor about all your current medicines and any you start or stop using, especially:
other asthma medications;
diet pills, an appetite suppressant, or stimulant medicine;
cold or allergy medicine that contains a decongestant; or
an antidepressant or medicine to treat mental illness.
This list is not complete. Other drugs may interact with racepinephrine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
More about Asthmanefrin (racepinephrine)
- Side Effects
- During Pregnancy
- Dosage Information
- Drug Interactions
- Support Group
- Pricing & Coupons
- En Español
- 7 Reviews – Add your own review/rating
- Drug class: adrenergic bronchodilators
Other brands: S2 Inhalant
Related treatment guides
Where can I get more information?
- Your pharmacist can provide more information about racepinephrine.
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
- Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2012 Cerner Multum, Inc. Version: 1.01.
Last reviewed: December 11, 2015
Date modified: May 03, 2017