Homepharmacology Impenem (carbepenem) - Valtrex publisher :NIL NAM -May 25, 2017 - Impenem (carbepenem) is: First thienamycin ß-lactam antibiotic. - Valtrex is: Acyclovir. Labels pharmacology Facebook Twitter Share:Impenem (carbepenem) - Valtrex Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email