Acetylcysteine Solution

Generic Name: Acetylcysteine (a-SEET-il-SIS-teen)Brand Name: Mucomyst

Acetylcysteine Solution is used for:

Treatment of abnormal, sticky, or thick mucus secretions in various lung problems (eg, chronic emphysema, bronchitis, asthmatic bronchitis, pneumonia, during anesthesia, following surgery or various lung tests).

Acetylcysteine Solution is a mucolytic. It works by thinning out mucus secretions, making them easier to move through the lungs.

Do NOT use Acetylcysteine Solution if:

  • you are allergic to any ingredient in Acetylcysteine Solution

Contact your doctor or health care provider right away if any of these apply to you.

Before using Acetylcysteine Solution:

Some medical conditions may interact with Acetylcysteine Solution. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances

Some MEDICINES MAY INTERACT with Acetylcysteine Solution. However, no specific interactions with Acetylcysteine Solution are known at this time.

Ask your health care provider if Acetylcysteine Solution may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Acetylcysteine Solution:

Use Acetylcysteine Solution as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Acetylcysteine Solution is inhaled into the lungs using a nebulizer. Your doctor will demonstrate the proper way to use the nebulizer. Be sure to only use the nebulizer recommended by your doctor.
  • If Acetylcysteine Solution is used with a face mask, a sticky substance may appear on the face. The stickiness can be removed by washing the face with water.
  • If you miss a dose of Acetylcysteine Solution, use it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not use 2 doses at once.

Ask your health care provider any questions you may have about how to use Acetylcysteine Solution.

Important safety information:

  • A slightly unpleasant odor may be noticeable while using Acetylcysteine Solution.
  • Acetylcysteine Solution may change color in the opened bottle. This is harmless.
  • If your breathing does not get better or if it gets worse, check with your doctor.
  • Lab tests may be performed while you use Acetylcysteine Solution. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
  • PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Acetylcysteine Solution while you are pregnant. It is not known if Acetylcysteine Solution is found in breast milk. If you are or will be breast-feeding while you use Acetylcysteine Solution, check with your doctor. Discuss any possible risks to your baby.

Possible side effects of Acetylcysteine Solution:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Cold, clammy skin; drowsiness; fever; inflammation of the mouth or tongue; nausea; runny nose; vomiting.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); mouth sores; throat and lung irritation.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (, or emergency room immediately.

Proper storage of Acetylcysteine Solution:

Store unopened vials of Acetylcysteine Solution at room temperature, between 68 and 77 degrees F (20 and 25 degrees C). Store away from heat, moisture, and light. Acetylcysteine Solution may be contaminated once opened. Store opened vials of undiluted medicine in the refrigerator between 36 and 46 degrees F (2 and 8 degrees C) for up to 4 days. Do not store in the bathroom. Keep Acetylcysteine Solution out of the reach of children and away from pets.

General information:

  • If you have any questions about Acetylcysteine Solution, please talk with your doctor, pharmacist, or other health care provider.
  • Acetylcysteine Solution is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.

This information is a summary only. It does not contain all information about Acetylcysteine Solution. If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

  • acetylcysteine Inhalation, oral/nebulization Advanced Consumer (Micromedex) - Includes Dosage Information
  • Acetadote Consumer Overview
  • Acetadote Prescribing Information (FDA)
  • Acetylcysteine solution Prescribing Information (FDA)
  • Mucomyst Prescribing Information (FDA)