What is S2 (Racepinephrine): Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

S2 (Racepinephrine) overview

BRAND NAMES:

  • Asthmanefrin, S-2 Inhalant, S-2 Inhalant

Generic Names:

  • S2 (Racepinephrine)

Uses:

  • Treats asthma and other breathing problems.

Therapeutic Classes:

  • Bronchodilator

Forms:

  • Liquid

How it’s taken:

  • By breathing

What is S2 (Racepinephrine) used for?

What form(s) does S2 (Racepinephrine) come in

  • Liquid

What are common S2 (Racepinephrine) doses?

  • Plas Cont 1 Nebulization Solution

Common S2 (Racepinephrine) prescriptions

  • S2 (Racepinephrine)
    2.25% inhalation vial for nebulizer

How to take S2 (Racepinephrine)

  • Inhalation routeYou will use this medicine with an inhaler device called a nebulizer. The nebulizer turns the medicine into a fine mist that you breathe in through your mouth and to your lungs. Your caregiver will show you how to use your nebulizer.

  • Inhalation routeYou will use this medicine with an inhaler device called a nebulizer. The nebulizer turns the medicine into a fine mist that you breathe in through your mouth and to your lungs. Your caregiver will show you how to use your nebulizer.

What to do if you miss a dose of S2 (Racepinephrine)

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

  • Inhalation routeAsk your pharmacist, doctor, or health caregiver about the best way to dispose of the used medicine container and any leftover medicine. You will also need to throw away old medicine after the expiration date has passed.

  • Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

S2 (Racepinephrine) contraindications

  • You should not use this medicine if you have had an allergic reaction to recepinephrine.

S2 (Racepinephrine) warnings

  • Inhalation routeIf any of your asthma medicines do not seem to be working as well as usual, call your doctor right away. Do not change your doses or stop using your medicines without asking your doctor.

  • Make sure your doctor knows if you have heart disease, high blood pressure, thyroid disease, diabetes, liver disease, or problems urinating. Tell your doctor if you are allergic to sulfite.

  • Make sure your doctor knows if you are pregnant or breast feeding.

S2 (Racepinephrine) interactions

  • Make sure your doctor knows if you have heart disease, high blood pressure, thyroid disease, diabetes, liver disease, or problems urinating. Tell your doctor if you are allergic to sulfite.

  • Inhalation routeIf any of your asthma medicines do not seem to be working as well as usual, call your doctor right away. Do not change your doses or stop using your medicines without asking your doctor.

  • Make sure your doctor knows if you are using a MAO inhibitor (MAOI) such as Eldepryl®, Marplan®, Nardil® or Parnate®, of if you have used one in the past 14 days.

S2 (Racepinephrine) side effects

Serious Side Effects

  • Severe confusion or nervousness.

  • Unusually fast heartbeat.

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

Less Serious Side Effects

  • Trouble sleeping.

  • Nervousness or tremors.

  • Nausea or loss of appetite.