How Many Times Can I Redose?

[-FighterFishh]

I've been treating my betta for finrot recently, and although the medicine is helping I need to keep redosing, but I'm unsure for how long I can keep doing so.
The packaging doesn't say anything about a limit to redoses. The actual bottle does have a plus sign with an 8 on it, though I have no idea if that has anything to do with redoses.
Any help would be much appreciated!
Thank you!

 

[-FighterFishh]

..anyone?

 

[Smells a bit fishy]

I would dose for recommended days, then leave, so that the fish can heal itself. Most fish are able to do this when the water quality is good.

What is your water change routine, how big the tank is, and who else is in the tank. Also what are your water readings? Ammonia nitrite and nitrate