Cysteine Hydrochloride
Cysteine Hydrochloride is an amino acid supplement and mucolytic agent used primarily to help break down and thin respiratory mucus, making it easier to clear from the airways. It is also administered as a component of parenteral nutrition to provide essential amino acid support in patients unable to meet their nutritional needs through oral intake. Additionally, it serves as a precursor to glutathione, an important antioxidant in the body.
Cysteine Hydrochloride is used as a mucolytic agent for respiratory conditions and as an amino acid supplement in nutritional therapy.
Key facts at a glance
- RxNorm
- 221086
- Generic
- Cysteine Hydrochloride
- Class
- pin-variant
- Brands
- Elcys, Nouress
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treatment of respiratory conditions with thick, tenacious mucus such as chronic bronchitis, cystic fibrosis, and other pulmonary disorders; component of parenteral and enteral nutrition for patients requiring amino acid supplementation; supportive care in acetaminophen toxicity management.
Acts as a mucolytic by breaking disulfide bonds in mucoproteins, reducing mucus viscosity. As an amino acid, it contributes to protein synthesis and serves as a precursor for glutathione production. The precise mechanism may vary by specific formulation and clinical application.
Should be used with caution in patients with compromised liver or kidney function. May interact with certain medications and should only be administered under medical supervision. Dosage and administration route depend on the specific clinical indication. Not a standard pharmaceutical classification; verify local regulatory status for intended use.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy