PCA = postconceptional age (gestational age (weeks) + postnatal age (weeks))
Aminoglycoside antibiotics (amikacin, gentamicin, tobramycin) may be inactivated by ampicillin when infused through the same IV line right after ampicillin. For all first doses of ampicillin and tobramycin administer the antibiotics one right after another using the following procedure: