Amoxicillin：7-[2-amino-2-(4-hydroxyphenyl) -acetyl]amino-3,3-dimethyl-6-oxo -2-thia-5-azabicyclo[3.2.0]heptane -4-carboxylic acid

Clavulanic acid：(2R,5R,Z)-3-(2-hydroxyethylidene)-7-oxo-4-oxa-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid

Allopurinol
May increase incidence of rash.

Contraceptives, oral
May reduce effectiveness of oral contraceptives.

Probenecid
May increase and prolong blood levels of amoxicillin.

Tetracyclines
May reduce antibacterial effectiveness of amoxicillin.