<human>: I've had acne for a long time and, a couple years ago, I decided to try something a bit out of the box to treat it.  I had some doxycycline left over from a prescription (I know I should have finished it, let's ignore that bad behavior) and I decided to open up the capsule, mix the contents in water and apply it like a mask before I went to bed.  And, for some reason, this really seemed to help my breakouts.  I don't know if it has anything to do with the antibiotic properties or it's something as simple as the fact it's a bit drying.  Anyhow, my dermatologist was okay with writing me a prescription and, for a couple years, the capsules I was getting were labelled "DAN 5440".  These capsules were nearly full with really fine powder, which were great for mixing with water.  The last time I picked up, the capsules said "2985 2985" and they were less than half full and the contents were really grainy--not great for mixing.  I've started to break out again, so my question:  is there any way to request that I get a certain manufacturer when I request a prescription?  I know you can request name brand versus generic, but can you get super specific and request "DAN 5440"?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Used to get doxycycline "DAN 5440" and now getting "2985 2985" which doesn't seem to work as well.  How do I ensure I get "DAN 5440"?