This combination is typically found in a liquid formulation such as a cough syrup, and is used to treat respiratory conditions characterized by coughing and mucus production. Here are the uses of each component in this specific formulation:

Terbutaline Sulphate (12.5mg per 5ml): A bronchodilator that helps relax and open the air passages in the lungs, making it easier to breathe. It is commonly used to treat asthma, bronchitis, and other breathing disorders.

Bromhexine Hydrochloride (2mg per 5ml): A mucolytic agent that thins and loosens mucus in the airways, making it easier to cough up and clear from the respiratory tract. It is used to treat respiratory conditions with excessive mucus, such as chronic bronchitis.

Guaiphenesin (50mg per 5ml): An expectorant that helps loosen and thin mucus in the lungs, making it easier to cough up and expel. It is used to relieve chest congestion and improve mucus clearance.

Menthol (0.5mg per 5ml): A mild analgesic and cooling agent that provides a soothing sensation to the throat and helps relieve minor throat irritation.

Uses of the Combination:

Asthma and Bronchitis: Terbutaline helps relieve bronchospasm, making it easier to breathe in conditions like asthma and bronchitis.

Mucus Clearance: Bromhexine and guaiphenesin work together to thin and loosen mucus, making it easier to cough up and clear from the airways. This is particularly useful in conditions like chronic bronchitis and other respiratory infections.

Relief from Cough and Congestion: The combination of expectorant and mucolytic effects helps relieve chest congestion and reduce coughing.

Throat Soothing: Menthol provides a cooling and soothing effect on the throat, helping to relieve minor throat irritation and improve comfort during coughing.

How It Works:

Terbutaline Sulphate: Relaxes the muscles in the airways and increases airflow to the lungs, helping to alleviate breathing difficulties.

Bromhexine Hydrochloride: Breaks down mucus, reducing its viscosity and making it easier to expel from the respiratory tract.

Guaiphenesin: Increases the volume and reduces the viscosity of secretions in the trachea and bronchi, aiding in mucus clearance.

Menthol: Provides a cooling sensation and mild anesthetic effect, helping to soothe the throat.

This combination is effective for treating respiratory conditions characterized by bronchospasm, excessive mucus production, and cough, providing comprehensive relief by improving airflow, reducing mucus, and soothing the throat.