Does the medication contain methylene blue? If yes, you must increase aeration or the fish will suffer from lack of oxygen. I use Sera Costapur to deal with white spots, but it contains malachite green, which can be deadly in the long term since it can cause some side effects in the fish. Another alternative is Sera Protazol, but this medication is quite concentrated so not advisable for use in small tanks.
To fix the issue you must catch and isolate any affected fish. It would be best that you try and catch all the fish into a separate hospital tank for the time being, say about 2 weeks or so. Without a host the parasite cannot complete the life cycle in the tank. In planted tanks that use chillers, their life cycle is lengthened by a few days, so if you do this isolation treatment, the fish must be kept away from the affected tank and treated in the hospital tank for about a month or so. After that you can re-introduce the fish into the old tank.
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