AUGMENTIN XR Rx. Share by Email. Print. Generic Name and Formulations: Amoxicillin 1000mg, clavulanic acid (as potassium) 62.5mg; scored ext-rel tabs.Two Augmentin 500mg tabs are not equivalent to one XR tab. ≥16yrs: 2 tabs every 12 hrs. Sinusitis: treat for 10 days. canadian-pharmacyv.com ...