The best replacement for clavulanate is amoxicillin.

The best alternatives to clavulanate are rated as following:
★★★★★  amoxicillin
★★★  sulbactam
★★  ampicillin sulbactam
★  amoxicillin trihydrate

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Speaking about clavulanate, one probably shouldn't forget about amoxicillin.

Other search terms related to clavulanate and their ratings are:

★★★★★ amoxicillin
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Google Trends

Scale is based on the average worldwide traffic of clavulanate in all years. Click on graph for more.