Efficacy and safety of modified tetracycline dosing in a quadruple therapy for Helicobacter pylori: A retrospective single center study

Table 3 Penicillin allergy of the enrolled patients and its intention-to-treat eradication rates

Penicillin allergy	500 mg b.i.d.	750 mg b.i.d.	500 mg t.i.d.
Yes	91.7% (22/24)	95.5% (21/22)	90.0% (27/30)
No	92.5% (123/133)	92.7% (89/96)	93.3% (83/89)

500mg b.i.d.: Tetracycline twice daily; 750 mg b.i.d.: Tetracycline twice daily; 500 mg t.i.d.: Tetracycline three times daily.