S2 Inhalant Side Effects
Generic name: racepinephrine
Medically reviewed by Drugs.com. Last updated on May 23, 2025.
Note: This document provides detailed information about S2 Inhalant Side Effects associated with racepinephrine. Some dosage forms listed on this page may not apply specifically to the brand name S2 Inhalant.
Applies to racepinephrine: inhalation solution.
Precautions
It is very important that your doctor check your or your child's progress at regular visits to make sure that this medicine is working properly and to check for unwanted effects.
Check with your doctor if your symptoms do not improve or if they get worse. Your asthma may be getting worse if:
- You are not better in 20 minutes.
- You need more than 12 inhalations in 24 hours.
- You use more than 9 inhalations in 24 hours for 3 or more days a week.
- You have more than 2 asthma attacks in a week.
Check with your doctor right away if you have trouble sleeping, fast heartbeat, tremors, nervousness, or seizures.
Do not use this medicine if you are using or have used an MAO inhibitor (MAOI) such as isocarboxazid [Marplan®], linezolid [Zyvox®], phenelzine [Nardil®], selegiline [Eldepryl®], tranylcypromine [Parnate®]) within the past 14 days.
This medicine may cause high blood pressure, which may increase your risk for heart attack or stroke. Check with your doctor right away if you are having chest pain or discomfort, nausea or vomiting, pain or discomfort in the arms, jaw, back, or neck, slurred speech, or weakness.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
Serious side effects of S2 Inhalant
Along with its needed effects, racepinephrine (the active ingredient contained in S2 Inhalant) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking racepinephrine:
Incidence not known
- blurred vision
- chest pain or discomfort
- confusion
- difficulty in speaking
- dizziness
- double vision
- headache
- inability to move the arms, legs, or facial muscles
- inability to speak
- nausea
- nervousness
- pain or discomfort in the arms, jaw, back, or neck
- pounding in the ears
- seizures
- slow or fast heartbeat
- slow speech
- sweating
- tremors
- vomiting
Other side effects of S2 Inhalant
Some side effects of racepinephrine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not known
- trouble sleeping
See also:
For healthcare professionals
Applies to racepinephrine: inhalation solution.
Cardiovascular adverse events
- Frequency not reported: Increased blood pressure, increase heart rate[Ref]
Nervous system
- Frequency not reported: Tremors, nervousness, seizure, difficulty sleeping[Ref]
Respiratory
- Frequency not reported: Worsening asthma[Ref]
References
1. (2010) "Product Information. S2 Inhalant (racepinephrine)." Nephron Pharmaceuticals
2. (2018) "Product Information. Asthmanefrin (racepinephrine)." Nephron Pharmaceuticals
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Further information
S2 Inhalant side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.