thats how side effects work, if you mean that you only shed the first few months of using it youre wrong. shedding can also randomly start 7 months into it and then later again etc
like the guy said, It could be a switching brands thing since some brands can cause more side effects than others, or maybe they started using lower a dosage without noticing
also, minoxidil doesnt stop alopecia progression and genetic hair loss, which could be the reason why some people experienced hair shedding