How risky is trying fin?

I got a prescription of fin filled but it’s just sitting in my room. Been balding for a few years now but I still have a hairline that’s receded in the temples. I’m not scared so much as about the side effects but the stories I’ve heard/read about permanent side effects that last even after you stop using fin. You can always stop it but don’t talk yourself into side effect because it is 100%

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