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Effects of Acetyl Cysteine on Sputum - Uses, Adverse Effects, and Precautions

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Acetylcysteine is a medication given to relieve chest congestion. It can be used as a mucolytic in patients with lung diseases.

Written byDr. Sri Ramya M

Medically reviewed byDr. Kaushal Bhavsar

Published At November 2, 2022
Reviewed AtAugust 2, 2024

Introduction

Sputum is a thick mucus produced in the lungs to keep the respiratory tract moist and trap foreign particles. Excess mucus production is seen during lung infection or disease. The coughing reflex attempts to cough up this mucus as sputum. Drugs like Acetylcysteine ease dry cough by thinning the mucus secretions.

What Is N-Acetylcysteine?

N-Acetylcysteine is derived from the semi-essential amino acid cysteine. A semi-essential amino acid can be produced in the body. Cysteine can be produced if the body's serine (amino acid) and methionine (amino acid) are present. It plays a critical role in the synthesis of glutathione and glutamate. Glutathione is an important antioxidant that maintains cellular health and protects the liver and kidneys. Glutamate is a significant neurotransmitter in the brain. Individuals with psychiatric disorders like depression, obsessive-compulsive disorder (OCD), and Parkinson's disease are low in glutathione and glutamate. N-Acetylcysteine has mucolytic, antioxidant, cytoprotective, and anti-inflammatory properties.

What Is the Mechanism of Action of Acetylcysteine?

Acetylcysteine is metabolized in the liver and excreted in the urine. After administration of a single dose, it exerts its action for 5.6 hours. A sulfhydryl compound increases the synthesis of glutathione in the liver. Glutathione has antioxidant properties. It suppresses cytokine production and exhibits anti-inflammatory properties. It regulates oxidative metabolisms and influences cellular regulatory functions. It minimizes vasoconstriction and oxidative stress.

What Is A Mucolytic Agent?

N-Acetylcysteine is a mucolytic agent. It is primarily used for treating respiratory diseases. It thins and loosens the mucus, making it easier to cough out the sputum. It is given in conditions like emphysema, bronchitis, asthma, pneumonia, tuberculosis, and cystic fibrosis. It is available as an inhalation, intravenous solution, oral capsule, oral tablet, effervescent, and compound powder. It is inhaled using a nebulizer to dissolve the thick mucus.

What Are the Effects of Acetylcysteine on Sputum?

The thickness of the mucus depends on the concentration of the mucoproteins. The sulfhydryl compound exerts mucolytic action. It opens the disulfide linkages in the mucus and reduces its viscosity. This occurs between pH 7 and 9. This reduces the thickness of the mucus and makes it easier to cough up sputum. This relieves bronchospasm when Acetylcysteine is used as an inhalation agent with the nebulizer.

Why Should Acetylcysteine Be Given?

Mucus acts as the line of defense against various harmful pathogens. It protects the epithelium from irritants in the gastrointestinal tract. It consists of proteins like immunoglobulins, glycoproteins, and antimicrobial enzymes like lysozyme. The cross-bridging polymeric gel-forming mucins act as a protective barrier against bacteria and inhibit the growth of the bacteria. It also acts as a barrier against respiratory irritants.

The mucus-secreting cells and the mucociliary escalators regulate the production of mucus. Excess mucus production is seen in COPD (chronic obstructive pulmonary disease) and asthma because of chronic irritation of the airway. Excess mucus production reduces the clearance of mucus and results in the formation of mucus plugs. The viscosity of the mucus is increased, clearance is reduced, and this initiates inflammation and fibrosis. Acetylcysteine is given in these conditions to decrease the viscosity of mucus, increase its flowability, and improves the clearance rate to ease the coughing up of the sputum.

What Are the Indications of Acetylcysteine?

It is given for conditions like:

  • Chronic emphysema.

  • Emphysema with bronchitis.

  • Chronic asthmatic bronchitis.

  • Tuberculosis.

  • Bronchiectasis.

  • Primary amyloidosis of the lungs.

  • Pneumonia.

  • Bronchitis.

  • Tracheobronchitis.

  • Cystic fibrosis.

  • For tracheostomy care.

  • Atelectasis.

  • Diagnostic studies like bronchograms, bronchospirometry, and bronchial wedge.

Is Acetylcysteine Safe in Pregnancy?

The safety of Acetylcholine during pregnancy is a subject of study. However, no drug is considered entirely risk-free. It is generally considered safe to use during pregnancy when needed. It may cause harm in critical situations, such as drug overdose. It is important to consult a healthcare provider before taking the drug to ensure the best outcome for both the mother and the baby.

How Is Acetylcysteine Administered?

Acetylcysteine is available as 10 percent and 20 percent solutions. It is given using a nebulizer - face mask, or mouthpiece. It is also directly instilled into the tracheostomy tube. It is also given through a percutaneous intrathecal catheter. Acetylcysteine is administered as a fine nebula from the nebulizer. The nebulized solution is directly inhaled from the nebulizer or through an attached face mask or mouthpiece. The drug can be given intravenously and orally. The loading dose of the drug is 150 mg/kg in 200 mL of five percent dextrose over 60 minutes. The second dose is 50 mg/kg in 500 mL of five percent dextrose over four hours. The oral dose of Acetylcysteine is 140 mg/kg.

Acetylcholine is often formulated as an effervescent tablet. For medical treatment, it is not used as an effervescent tablet. These tablets are commonly used for their mucolytic properties to loosen mucus in the airways. It makes it easier to clear the mucus. The effervescent tablets are dissolved in the glass of water before consuming.

What Are the Other Uses of Acetylcysteine?

  • It is used as an antidote for Paracetamol overdose.

  • It preserves lung function and prevents exacerbation in COPD (chronic obstructive pulmonary disease).

  • It prevents contrast-induced nephropathy in patients undergoing radiologic procedures.

  • It reduces the effect of influenza infection.

  • It prevents deterioration of lung function in idiopathic pulmonary fibrosis.

  • It is used along with clomiphene in treating polycystic ovary syndrome and infertility.

  • It may prevent post-surgical pulmonary complications in patients undergoing esophagectomy for cancer.

  • It is used as an adjunct in the treatment of Helicobacter pylori infection.

  • It is used in treating psychiatric disorders as it regulates the levels of glutamate, an important neurotransmitter in the brain.

  • It stimulates the production of glutathione, an antioxidant that maintains cellular health.

What Are the Adverse Effects of Acetylcysteine?

Adverse effects are uncommon, but nausea, vomiting, diarrhea, transient skin rash, flushing, epigastric pain, and constipation may occur. When higher doses are given to treat Acetaminophen overdose, it may cause headache, tinnitus, urticaria, fever, chills, and anaphylaxis.

What Are the Precautions to Be Taken?

  • Acetylcysteine is contraindicated in patients with previous allergies.

  • It is used with caution in patients with a history of bronchospasm.

  • Nebulized Acetylcysteine should be used with caution in patients with inadequate cough reflexes.

  • Oral Acetylcysteine can induce vomiting and increase the risk of upper gastrointestinal bleeding in patients with esophageal varices or peptic ulcers.

  • Intravenous Acetylcysteine should be used with caution in patients with heart failure and renal diseases because intravenous administration increases the volume load and results in hyponatremia (low level of sodium in the blood), seizures, and death in severe cases.

  • It is also used with caution in pediatric patients requiring fluid restriction.

  • It has inadequate studies for determining the risks in pregnant and breastfeeding women.

Conclusion:

Acetylcysteine is a well-known drug used to treat respiratory disorders to break mucus plugs. It is a safe and non-toxic drug. It has remarkable antioxidant and anti-inflammatory properties. It is also used in managing the symptoms of COVID (coronavirus disease). Acetylcysteine is also a dietary supplement for liver protection and immune system function. It is important to consult the physician before consuming Acetylcysteine, and it is not safe to self-medicate

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Frequently Asked Questions

Acetylcysteine dissolves mucus by liquifying it so that it is coughed up. Sometimes the dissolved mucus might have to be removed by suction. The disulfide bonds of mucus proteins are hydrolyzed by Acetylcysteine to decrease mucus viscosity and help in its clearance.
Acetylcysteine (inhaled dose) is used for the treatment of lung disorders like bronchitis, emphysema (damage of the air sacs in the lungs causing shortness of breath), cystic fibrosis (a rare genetic life-threatening disorder that causes damage to the lungs and digestive system), and pneumonia (an infection that leads to inflammation of the air sacs of the lungs). Acetylcysteine (oral) is used in the case of Acetaminophen overdose to prevent liver damage.
Acetylcysteine is beneficial in certain lung disorders, causing breathing difficulty involving increased mucus. Acetylcysteine helps to remove the mucus by dissolving it and further eliminates the cough.
The side effects of Acetylcysteine include difficulty with breathing or swallowing, itching or hives, and rashes with or without fever. Other side effects that can be experienced are vomiting, swelling of the eyes and face, and reddening of the skin, particularly around the ears.
Acetylcysteine is not an antibiotic. N-Acetylcysteine (NAC) is a mucolytic agent with anti-inflammatory and antioxidant properties that works by thinning the mucus and helps to clear the airway passage.
The most suitable time for Acetylcysteine intake for oral use is after a meal. The capsule should be swallowed with water. Acetylcysteine, similar to other amino acid supplements, must be taken either thirty minutes before or two hours after eating for proper absorption.
The frequency of administration of Acetylcysteine in a day depends on the severity of the illness. The usual dose is 200 milligrams thrice daily. Six hundred milligrams is the maximum recommended daily dose. The patient is adviced to consume plenty of water as it promotes the mucolytic effect of Acetylcysteine.
Acetylcysteine must be avoided by people suffering from asthma, bleeding disorders, or who are taking blood thinning because it might hamper the process of blood clotting. The patients find it difficult to consume Acetylcysteine as an unpleasant odor.
Acetylcysteine 600 milligrams is usually administered once daily. However, in some patients with moderate-to-severe chronic pulmonary obstructive disease (COPD), Acetylcysteine 600 mg can be used twice daily for long-term usage as it helps prevent exacerbations.
Acetylcysteine is highly effective when taken on an empty stomach. Acetylcysteine, similar to other amino acid supplements, must be taken either thirty minutes before or two hours after eating for proper absorption.
Acetylcysteine is a classic mucolytic drug that acts by reducing the viscoelastic properties of mucus by decreasing the disulfide bonds. On the contrary, the expectorants alter the consistency of mucus and cause productive coughing.
The 600-milligram Acetylcysteine effervescent tablets in half a glass of water and the mixture must be consumed immediately. Elderly and weakened patients with a reduced cough reflex are advised to take this medication in the mornings.
Acetylcysteine acts by lowering the viscosity of mucus by splitting the disulfide bonds of mucoproteins that are vital for the stability of mucus.
 
In the case of Acetaminophen overdose, Acetylcysteine acts by increasing the synthesis of glutathione in the liver. Glutathione further acts as an antioxidant and helps in the conjugation of toxic metabolites, especially the toxic metabolites of Acetaminophen.
Intravenous Acetylcysteine is contraindicated in patients who have had an anaphylactoid reaction to Acetylcysteine in the past. Acetylcysteine solution for inhalation or oral use is contraindicated in patients who have previously experienced a hypersensitivity reaction to the drug.
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