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It should be fine. Fish medicine is not as well researched as in most other animals, but things can work on more than one ailment.
The only problem you might have is if the particular fungus your fish has happens to be resistant to that med. If the fish doesn't improve within a day or two, you might have to try another brand.
Do a big water change and run some carbon for 24 ours between treatments, if you have to do that.
Just follow what it says on the bottle.