Hello Doctor, please advise, my 5 year old son has been prescribed Pancef for a chest infection and has been diagnosed asthmatic , just yesterday. We were told to administer Pancef first thing in morning before breakfast. How long must stomach remain empty for after dose? Also, I look online for information on this drug and find it must be taken with or after food which conflicts with how it was prescribed. Please advise,, Thank you for your help.