can my 5 yr old take benedryl and child robitussin while taking orapred for coughing asthma?

Posted by Hayley

just coming off flu virus which irritates his asthma.  he has post nasal drip and alot of sneezing and would like to give him an antihistamine and cough suppressant to help him sleep and get thru the night w/o coughing.  He just started taking 20mg of orapred today twice a day.  Are the above two over the counter meds OK with his orapred?