Sally: unasyn is ampicillin sodium/silbactam sodium... an injecta ble antibacterial comsisting of semisynthetic ampicillin sodiam and the beta lactamease inhibitor sulbacam sodium.... from pdr: low concentration of amicillin and slbactam are extcreted into milk, therefore castion shoule be exercised... to me, a layman, this is no different than other antibiotics or the caution.... hopefully one of our pharacists will assit... nitroprusside is a antihypertensive it relaxes smooth muscles and dialtes paeriferal ateries and veins. its metabloite is thiocyanate and is eliminated in the urine. the cyanide does bind to plasma..... patricia