What it's for (Indications)
- This fixed-dose combination medication, containing carbocisteine and promethazine, is indicated for the symptomatic relief of various respiratory conditions characterized by productive cough and associated allergic manifestations.
- Carbocisteine acts as a mucolytic, facilitating the thinning and expulsion of viscous mucus from the respiratory tract, thereby aiding in cough expectoration.
- Promethazine, a first-generation antihistamine, addresses symptoms such as sneezing, rhinorrhea, pruritus, and may also provide sedative effects beneficial for nighttime symptom relief, particularly when sleep is disturbed by cough or allergic discomfort.
- It is primarily used for conditions like bronchitis, tracheitis, and other inflammatory respiratory diseases where thick mucus is problematic and allergic components are present.
Dosage Information
| Type | Guideline |
|---|---|
| Standard | Dosage of the carbocisteine and promethazine combination must be carefully individualized based on patient age, weight, severity of symptoms, and renal/hepatic function. Due to the significant risk of respiratory depression, this medication is strictly contraindicated in children under 2 years of age. For pediatric patients 2 years and older, the lowest effective dose should be used, and duration of therapy should be limited. Adult dosing typically involves a specific volume or number of tablets/capsules administered every 4-6 hours, not exceeding a maximum daily dose. It is crucial to adhere strictly to prescribed dosages and not to exceed the recommended frequency or total daily intake to mitigate the risk of adverse effects, particularly those related to promethazine's sedative and respiratory depressant properties. Elderly patients may require reduced dosages due to increased susceptibility to anticholinergic side effects and CNS depression. Always consult a healthcare professional for precise dosing instructions before initiation of therapy. |
Safety & Warnings
Common Side Effects
- The carbocisteine and promethazine combination may elicit a range of side effects, primarily attributable to the promethazine component.
- Common adverse effects include significant central nervous system (CNS) depression, manifesting as drowsiness, sedation, dizziness, and impaired coordination, which can affect the ability to drive or operate machinery.
- Anticholinergic effects are also prevalent, encompassing dry mouth, blurred vision, urinary retention, and constipation.
- Gastrointestinal disturbances such as nausea, vomiting, and epigastric discomfort may occur, particularly with carbocisteine.
- More serious but less common side effects include respiratory depression (especially in young children), paradoxical excitation (particularly in children and the elderly), seizures, neuroleptic malignant syndrome-like reactions (rarely), and blood dyscrasias like leukopenia or agranulocytosis.
- Cardiovascular effects such as hypotension and tachycardia have also been reported.
- Patients should be advised to report any persistent or severe adverse reactions to their healthcare provider promptly.
Serious Warnings
- Black Box Warning: **BLACK BOX WARNING: RESPIRATORY DEPRESSION IN PEDIATRIC PATIENTS** This medication, containing promethazine, is strictly contraindicated in pediatric patients less than 2 years of age due to the potential for fatal respiratory depression. Postmarketing cases of respiratory depression, including fatalities, have been reported with the use of promethazine in pediatric patients less than 2 years of age. Caution should be exercised when administering promethazine to pediatric patients 2 years of age and older because of the potential for fatal respiratory depression. Concomitant administration with other respiratory depressants should be avoided in all pediatric populations. The lowest effective dose should be used, and the patient's respiratory status should be monitored closely. Furthermore, promethazine injection should not be administered via the intra-arterial or subcutaneous route due to the risk of severe tissue injury, including gangrene. Deep intramuscular injection is the preferred route for parenteral administration of promethazine formulations.
- This medication requires careful consideration and carries significant warnings due to its active components.
- The prominent sedative effects of promethazine necessitate extreme caution when performing tasks requiring mental alertness, such as driving or operating heavy machinery.
- Concomitant use with other central nervous system depressants, including alcohol, opioids, benzodiazepines, and other sedatives, can potentiate CNS and respiratory depression, leading to severe and potentially life-threatening outcomes.
- Promethazine can cause paradoxical excitation, irritability, or nightmares in pediatric patients and occasionally in adults.
- Patients with compromised respiratory function, such as those with chronic obstructive pulmonary disease (COPD) or asthma, should use this medication with extreme caution, as it may exacerbate respiratory depression.
- Anticholinergic effects can worsen conditions like glaucoma, prostatic hypertrophy, and bladder neck obstruction.
- Elderly patients are particularly susceptible to anticholinergic side effects, sedation, and hypotension.
- The use of carbocisteine should be monitored in patients with a history of peptic ulcers.
- This drug can interfere with immunological pregnancy tests, producing false-negative or false-positive results.
How it Works (Mechanism of Action)
The therapeutic efficacy of this combination product stems from the distinct pharmacological actions of its two active ingredients: carbocisteine and promethazine. Carbocisteine functions as a mucolytic agent. It works by altering the synthesis of mucin glycoproteins, specifically by regulating the goblet cells and seromucous glands in the respiratory epithelium. By disrupting the disulfide bonds within the mucoproteins of bronchial secretions, it reduces the viscosity and elasticity of mucus. This action makes the sputum less tenacious and easier to expectorate, thereby facilitating the clearance of the respiratory tract. Promethazine, on the other hand, is a first-generation phenothiazine derivative antihistamine. Its primary mechanism involves competitively blocking histamine H1 receptors in the central nervous system and periphery. This blockade alleviates allergic symptoms such as sneezing, rhinorrhea, and pruritus. Additionally, promethazine exerts significant anticholinergic, antiemetic, and sedative effects due to its action on muscarinic, dopaminergic, and alpha-adrenergic receptors, contributing to its utility in managing cough-related sleep disturbances and associated allergic reactions.
Commercial Brands (Alternatives)
No other brands found for this formula.