Also, if you ever have any pill you cannot identify (though this one is easily & repeatedly found at Google simply by search for “DAN 5440”) then it is fast & accurate to phone your nearest Poison Control Center. Given the Letter + Number code I believe they can ID any medication for you (with or without the color mentioned), in my experience. I have done this in the past when a lone or out of place pill was found.
It is good to know their phone number in advance in case any children might visit & manage to find their way into anything from medication to cleaners or insecticides, etc. So I found it reassuring to post it inside of cabinet doors where anyone present would see it if somehow something dangerous got left in an accessible cabinet by mistake.
That’s right
This pill is DOXYCYCLINE HYCLATE 100 MG
Imprint Code DAN 5440 / DAN 5440
Description blue, oblong capsule
Info at http://www.drugs.com/MTM/doxycycline.html