The combination of Terbutaline 1.25mg, Bromhexine 2mg, Guaifenesin 50mg, and Menthol 0.5mg is used to treat respiratory conditions like asthma, bronchitis, and other chronic obstructive pulmonary diseases (COPD), especially when accompanied by coughing and mucus production.

Terbutaline is a bronchodilator that helps relax the muscles of the airways, making it easier to breathe and relieving symptoms of wheezing and shortness of breath.
Bromhexine is a mucolytic agent that helps to break down and thin mucus in the airways, making it easier to clear the mucus through coughing.
Guaifenesin is an expectorant that works to loosen and thin mucus in the chest, helping to clear the airways and reduce congestion.
Menthol provides a soothing effect by acting as a mild local anesthetic and decongestant, helping to relieve symptoms like chest congestion and throat irritation.