Yes, you are correct; Cosopt is a combination of timolol maleate 0.5% and dorzolamide HCL 2%. Using each drop individually may in fact be cheaper depending on where you get the medications and what insurance company you are currently using. In most cases, you can get timolol for 4 dollars at many of the national chain pharmacies. Recently, however, Cosopt has become available as a generic medication. This being the case, it may now be cheaper to buy the single bottle of generic Cosopt instead of a bottle each of timolol and dorzolamide. Check with your local pharmacist and they can assist you making that comparison.