How long does it take for Ambroxol to start working to expel phlegm?

　　Ambroxol is commonly available in oral solution, injection, and dispersible tablet formulations. Under normal circumstances, expectoration effects may begin 1-4 hours after administration. If there is no significant improvement after using ambroxol or if the condition worsens, prompt medical attention should be sought. Detailed explanation is as follows:

　　Ambroxol is a mucolytic agent that increases secretion from the serous glands of the respiratory mucosa, reduces secretion from mucous glands, thereby lowering sputum viscosity, promoting secretion of pulmonary surfactant, enhancing ciliary movement in the bronchi, and facilitating easier expectoration. Generally, expectorant effects may begin about 1-2 hours after oral administration of ambroxol.

　　If the patient's sputum is abnormally viscous or if there is a severe respiratory infection, the onset time of ambroxol may be prolonged, potentially requiring 2-4 hours to take effect. Insufficient dosage or improper administration methods may affect drug absorption and efficacy, potentially leading to suboptimal results.

　　During ambroxol treatment, it is important to drink plenty of warm water to help dilute the sputum and facilitate its removal. Consumption of spicy, greasy, or irritating foods should be avoided to prevent exacerbation of sputum production.