Megatuss P
Megatuss P Uses, Dosage, Side Effects, Food Interaction and all others data.
Bromhexine is an oral mucolytic agent with a low level of associated toxicity. It acts on the mucus at the formative stages in the glands, within the mucus-secreting cells. Bromhexine disrupts the structure of acid mucopolysaccharide fibres in mucoid sputum and produces less viscous mucus, which is easier to expectorate
Bromhexine thins airway secretions, improving breathing and discomfort associated with thick mucus in airways associated with a variety of respiratory conditions.
Guaifenesin possesses a storied history, having been originally formally approved by the US FDA in 1952 and continues to be one of very few - if not perhaps the only drug that is readily available and used as an expectorant . Since that time the agent has been a combination component of various prescription and non-prescription over-the-counter cough and cold products and is currently a widely available over-the-counter generic medication . Although it is principally believed that guaifenesin elicits an action to facilitate productive cough to manage chest congestion , it is not known whether the agent can reliably mitigate coughing.
Regardless, on March 1, 2007, the FDA received a petition asking the FDA to notify the public that some antitussives, expectorants, decongestants, antihistamines, and cough/cold combinations are not known to be safe and effective in children under the age of 6 years . After the negotiation between FDA and major manufacturers, a voluntary transition of labels for not using guaifenesin in children under the age of 4 years was endorsed by FDA in 2008 .
Furthermore, there has also been contemporary research to suggest that guaifenesin possesses and is capable of demonstrating anticonvulsant and muscle relaxant effects to some degree possibly by acting as an NMDA receptor antagonist .
| Trade Name | Megatuss P |
| Generic | Bromhexine + Guaifenesin |
| Type | Liquid |
| Therapeutic Class | |
| Manufacturer | Glaxosmithkline |
| Available Country | India |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Bromhexineis used for the treatment of respiratory disorders associated with productive cough. These include; tracheobronchitis, bronchitis with emphysema, bronchiectasis, bronchitis with bronchospasm, chronic inflammatory pulmonary conditions and pneumoconiosis.
Guaifenesin is an expectorant commonly found in OTC products for the symptomatic relief from congested chests and coughs associated with cold, bronchitis, and/or other breathing illnesses.
Guaifenesin is an expectorant that is indicated for providing temporary symptomatic relief from congested chests and coughs which may be due to a cold, bronchitis, and/or other breathing illnesses .
Megatuss P is also used to associated treatment for these conditions: Bronchiectasis, Common Cold, Cough, Cough caused by Common Cold, Nasal Congestion, Whooping Cough, Airway secretion clearance therapyAllergic Reaction, Asthma, Asthma, Allergic, Bronchial Asthma, Bronchitis, Bronchospasm, Chronic Bronchitis, Chronic Obstructive Respiratory Diseases, Common Cold, Cough, Cough caused by Common Cold, Coughing caused by Allergies, Coughing caused by Flu caused by Influenza, Drug Allergy, Emphysema, Fever, Flu caused by Influenza, Food Allergy, Headache, House dust allergy, Irritative cough, Laryngitis, Nasal Congestion, Nasal Congestion caused by Common Cold, Phlegm, Pollen Allergy, Productive cough, Rash, Rhinorrhoea, Sneezing, Sore Throat, Tracheitis, Urticaria, Whooping Cough, Acute Rhinitis, Chest congestion, Chills occurring with fever, Dry cough, Excess mucus or phlegm, Mild to moderate pain, Minor aches and pains, Airway secretion clearance therapy, Expectorant
How Megatuss P works
Inflammation of the airways, increased mucus secretion, and altered mucociliary clearance are the hallmarks of various diseases of the respiratory tract. Mucus clearance is necessary for lung health; bromhexine aids in mucus clearance by reducing the viscosity of mucus and activating the ciliary epithelium, allowing secretions to be expelled from the respiratory tract.
Recent have studies have demonstrated that bromhexine inhibits the transmembrane serine protease 2 receptor (TMPRSS2) in humans. Activation of TMPRSS2 plays an important role in viral respiratory diseases such as influenza A and Middle East Respiratory Syndrome (MERS). Inhibition of receptor activation and viral entry by bromhexine may be effective in preventing or treating various respiratory illnesses, including COVID-19. In vitro studies have suggested the action of ambroxol (a metabolite of bromhexine) on the angiogensin-converting enzyme receptor 2 (ACE2), prevents entry of the viral envelope-anchored spike glycoprotein of SARS-Cov-2 into alveolar cells or increases the secretion of surfactant, preventing viral entry.
Although the exact mechanism of action of guaifenesin may not yet be formally or totally elucidated, it is believed that expectorants like guaifenesin function by increasing mucus secretion . Moreover, it is also further proposed that such expectorants may also act as an irritant to gastric vagal receptors, and recruit efferent parasympathetic reflexes that can elicit glandular exocytosis that is comprised of a less viscous mucus mixture . Subsequently, these actions may provoke coughing that can ultimately flush difficult to access, congealed mucopurulent material from obstructed small airways to facilitate a temporary improvement for the individual .
Consequently, while it is generally proposed that guaifenesin functions as an expectorant by helping to loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive, there has also been research to suggest that guaifenesin possesses and is capable of demonstrating anticonvulsant and muscle relaxant effects to some degree possibly by acting as an NMDA receptor antagonist .
Dosage
Megatuss P dosage
BromhexineTablet:
Adults and children over 10 years: 8-16 mg 3 times daily. Children 5-10 years: 4 mg 3 times daily.
BromhexineSyrup:
Adults: The recommended daily dose is 2 to 4 teaspoonful 3 times. Initially 4 teaspoonful 3 times daily and then as required.
Children: Suggested dosage for children under 2 years is 1/4 teaspoonful 3 times daily, for 2-5 years 1/2 teaspoonful 3 times daily and for children aged 5-10 years 1 teaspoonful 3 times daily.
Side Effects
Gastrointestinal side-effects may occur occasionally with Bromhexine and a transient rise in serum aminotransferase values has been reported. Other reported adverse effects include headache, dizziness, sweating and skin rash.
Toxicity
The oral LD50 of bromhexine in rats is 6 g/kg. The observed symptoms of accidental overdose with bromhexine are consistent with the known adverse effects of bromhexine, including headache, nausea, and vomiting, among other symptoms. Provide symptomatic treatment and contact poison control services if an overdose is confirmed or suspected.
The most prevalent signs and symptoms associated with an overdose of guaifenesin have been nausea and vomiting .
Although adequate and well-controlled studies in pregnant women have not been performed, the Collaborative Perinatal Project monitored 197 mother-child pairs exposed to guaifenesin during the first trimester . An increased occurrence of inguinal hernias was found in the neonates . However, congenital defects were not strongly associated with guaifenesin use during pregnancy in 2 large groups of mother-child pairs .
Moreover, guaifenesin is excreted in breast milk in small quantities . Subsequently, caution should be exercised by balancing the potential benefit of treatment against any possible risks .
Additionally, an LD50 value of 1510 mg/kg (rat, oral) has been reported for guaifenesin .
Precaution
Since mucolytics may disrupt the gastric mucosa so Bromhexine should be used with care in patients with a history of peptic ulceration.
Volume of Distribution
After intravenous administration in a pharmacokinetic study, bromhexine was found to be widely distributed. Bromhexine is known to cross the blood-brain barrier; small concentrations may cross the placenta. The average volume of distribution of bromhexine was 1209 ± 206 L (19 L/kg). Lung tissue concentrations of bromhexine two hours after a dose were 1.5 to 3.2 times higher in bronchial tissues than plasma concentrations. Pulmonary parynchema concentrations were 3.4 to 5.9 times higher when compared to plasma concentrations.
The geometric mean apparent volume of distribution of guaifenesin determined in healthy adult subjects is 116L (CV=45.7%) .
Elimination Route
After oral administration, bromhexine demonstrates linear pharmacokinetics when given in doses of 8-32 mg. Bromhexine is readily absorbed in the gastrointestinal tract at a rapid rate. This drug undergoes extensive first-pass effect in the range of 75-80%. The bioavailability is therefore reduced to approximately 22-27%.
Studies have shown that guaifenesin is well absorbed from and along the gastrointestinal tract after oral administration .
Half Life
Following single oral doses ranging from 8 and 32 mg, the terminal half-life of bromhexine has been measured between 6.6 and 31.4 hours.
The half-life in plasma observed for guaifenesin is approximately one hour .
Clearance
The clearance of bromhexine ranges from 843-1073 mL/min, within the range of the hepatic circulation.
The mean clearance recorded for guaifenesin is about 94.8 L/hr (CV=51.4%) .
Elimination Route
After a dose of bromhexine was administered during a pharmacokinetic study, approximately 97% of the radiolabeled dose was detected in the urine; under 1% was detected as the parent drug.
After administration, guaifenesin is metabolized and then largely excreted in the urine .
Pregnancy & Breastfeeding use
Pregnancy Category B. Bromhexine has been taken by a large number of pregnant women and women of child bearing age without any proven increase in the frequency of malformations or other direct or indirect harmful effects on the fetus having been observed.
It is not known whether bromhexine is excreted in breast milk or whether it has a harmful effect on the breastfeeding infant. Therefore it is not recommended for breast feeding mothers unless the potential benefits to the patient are weighed against the possible risk to the infant.
Contraindication
Contraindicated to those who are hypersensitive to Bromhexine Hydrochloride.
Storage Condition
Store below 25° C. Protect from light. Keep the container tightly closed.
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