"Drain enzymes" (like Rid-X) don't help the drains, they help the septic tank. If you don't have a septic tank - ie, you connect to city sewer, then these don't help you.
A well-functioning septic tank has bacteria which break down the sewage into sludge (which must be pumped out occasionally) and effluent, which is mostly water and is distributed through the leach field. If you were to kill all the bacteria in your tank, you could clog up the leach field. One way to do this is to dump many tens of gallons of bleach or chlorine in it.
But, it takes a lot! For perspective, a typical sewage tank for a SFH is 1250 gallons; to kill the bacteria, you need a 1:5 bleach:water solution, so roughly 250 gallons of bleach. Pouring even a half dozen gallon containers of bleach down the drain is unlikely to affect your septic system.
In the unlikely event that you need to replenish the septic enzymes (bacteria), the best way to do that is to poop in it. All the enzymes your septic system needs are contained in a resource to which you have plentiful access.