Hi, I Am Taking The Eye Drops Of Dorzolomide HCI

Hi, I am taking the eye drops of Dorzolomide HCI (with orange cap) for glaucoma in both eyes 3 times a day. I seam to be short of these drops before my appointment with my doctor in a month. I suspect that my doctor will change my subscriptions, so I don't want to get 3 more Dorzolomides by just ordering a refill.
But I have Dorzolomide that I got before (with blue cap). I kept it in the fridge and it is not expired yet. I want to take it if I don't get enough of orange cap Dorzolomide before my doctors appointment. I saw that blue cap Dorzolomide is advertised now in an animals pharmacy. Do you think it is OK for me to take that blue cap Dorzolomide ? Thanks