Hetacillin is a beta-lactam antibiotic that is part of the aminopenicillin family. Hetacillin is a prodrug that is converted to ampicillin via esterases. Ampicillin binds to inactivated penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. PBPs, including transpeptidases, carboxypeptidases, and endopeptidases, participate in the terminal stages of assembling the bacterial cell wall and in reshaping the cell wall during growth and division. It is a prodrug and it has no antibacterial activity itself but quickly splits of acetone in the human body to form ampicillin, which is active against a variety of bacteria.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.