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Micronefrin Side Effects

Generic name: racepinephrine

Medically reviewed by Last updated on Aug 18, 2023.

Note: This document contains side effect information about racepinephrine. Some dosage forms listed on this page may not apply to the brand name Micronefrin.

Applies to racepinephrine: inhalation solution.

Serious side effects of Micronefrin

Along with its needed effects, racepinephrine (the active ingredient contained in Micronefrin) 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

Other side effects of Micronefrin

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

For Healthcare Professionals

Applies to racepinephrine: inhalation solution.


Frequency not reported: Increased blood pressure, increase heart rate[Ref]

Nervous system

Frequency not reported: Tremors, nervousness, seizure, difficulty sleeping[Ref]


Frequency not reported: Worsening asthma[Ref]

More about Micronefrin (racepinephrine)

Patient resources

Other brands

Asthmanefrin, S2 Inhalant

Related treatment guides


1. Product Information. S2 Inhalant (racepinephrine). Nephron Pharmaceuticals. 2010.

2. Product Information. Asthmanefrin (racepinephrine). Nephron Pharmaceuticals. 2018.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.