I think the lasix and kidney thing comes from bodybuilders taking lasix and dehydrating themselves.
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That’s generally what I’ve figured since people on bodybuilding forums treat diuretics like they are seriously dangerous drugs which isn’t the case if you’re at a normal state of food and fluid intake. Just expect most guys to educate themselves more I guess.
Personally I’d use HCTZ just because of the half life but either will work fine.