Effectiveness and safety of Xingbei Zhike granules in patients with postinfectious cough: A multicenter, randomized, double-blinded, placebo-controlled trial.

Background: Postinfectious cough (PIC) is a common symptom following a respiratory tract infection. Xingbei Zhike (XBZK) granules, a Chinese patent medicine, has been widely used for PIC in clinics. However, there is a lack of evidence on the effectiveness.