I went to the doctor and concluded that I had a stomach ulcer, HP, and gave me a prescription: Amoxicillin 500mg; Clarithromycin 500mg; Tinidazole 500mg; Esomeprazole 20mg. Take 1 pill in the morning, 1 pill in the afternoon. So the doctor told me to ask people with HP gastritis should take the medicine before or after eating