is penicillin an acid or base
/amÂ·piÂ·cilÂ·lin/ (amâ³pÄ­-silÂ´in) a semisynthetic, acid-resistant, penicillinase-sensitive penicillin used as an antibacterial against many gram-negative and gram-positive bacteria; also used as the sodium salt.mpicillin. [amâ²pÉsilâ²in]. a semisynthetic aminopenicillin. indication It is prescribed in the treatment of infections caused by a broad spectrum of sensitive gram-negative and gram-positive organisms. contraindication Known hypersensitivity to any penicillin prohibits its use.