If it wasn't an inside the job, I think the thieves were saying "What the F?, no narcotics?". Many times, theives aren't the brightest bunch.
I am thinking more like xanox(?) or those anti depression drugs kids take. I don't think there's a big street market for cialis as it is so easy to get prescriptions for ED drugs or you can get them online easily by just answering some questions (or so a friend tells me).