Study participants will be randomly assigned to Test or Control group and the following schedule will be followed~Test group: metronidazole tablets + doxycycline hyclate tablets simulant are consecutively taken for 14 days, while Fuke Qianjin capsule is consecutively taken for 28 days.~Control group: metronidazole tablets + doxycycline hyclate tablets, are consecutively taken for 14 days, while Fuke Qianjin capsule simulation is consecutively taken for 28 days.~Fuke Qianjin Capsules and their simulants are taken as 2 capsules at a time, 3 times a day, orally after breakfast, lunch and dinner, respectively; Metronidazole Tablets are taken as 2 tablets (0.2 g/tablet) at a time, twice a day, at the same time as breakfast and dinner, respectively; Doxycycline Hyclate Tablet and their simulants are taken as 1 tablet (0.1 g/tablet, Doxycycline Hyclate Tablet calculated as C22H24N2O8) at a time, twice a day, at the same time as breakfast and dinner, respectively.~Scoring pain, symptoms, local signs, routine leucorrhea, cervical secretions, gynaecological B-ultrasound will be examined before the enrollment and after study completion.
Randomized, double blind and positive-controlled clinical trial to assess the efficacy and safety of Fuke Qianjin Capsule compared to Doxycycline Hyclate Tablet in patients with mild to medium PID and its sequalae.