Sirup Batuk Rejan digunakan untuk mengobati batuk rejan dengan cara meredakan batuk, menenangkan asma dan mengatasi dahak. Sirup Batuk Rejan terdiri dari Teh Shortland, Honeysuckle, Daun Loquat, Platycodonis, Almond, dll. Sirup ini berkhasiat untuk meredakan batuk dan asma (menghentikan batuk dan menenangkan mengi), melembabkan paru-paru dan mengatasi dahak. In the formula, Honeysuckle can clear away heat and detoxify the toxin (to remove heat and toxicity in the body), and disperse wind-heat; Short Earth Tea can suppress cough and expectorate, calm asthma and inhibit bacteria; Loquat Leaf can clear the lung and relieve cough, lower the rebelliousness of the stomach; Chen Pi can regulate qi and the middle of the body (to regulate the qi in the spleen and stomach, so as to make the function of the spleen and stomach smooth), and remove dampness and resolve phlegm (to use dampness medication to dispel phlegm in the body); Almonds can relieve cough and calm asthma, and moisten and laxate the intestines; Platycodon grandiflorus can promote lung to relieve cough and dispel phlegm to drain the abscesses. Reaksi yang merugikan dan kontraindikasi Sirup Batuk Rejan tidak jelas, disarankan agar pasien menggunakan obat di bawah bimbingan dokter, jangan minum obat sendiri, agar tidak menunda kondisinya.