Penamecillin
Encyclopedia
Penamecillin, a acetoxymethyl ester of benzylpenicillin, is a pro-drug
Prodrug
A prodrug is a pharmacological substance administered in an inactive form. Once administered, the prodrug is metabolised in vivo into an active metabolite, a process termed bioactivation. The rationale behind the use of a prodrug is generally for absorption, distribution, metabolism, and...

that is processed to benzylpenicillin by esterases.
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