I think it was 3 years ago that i got 2 months straight, every day, with no interruptions with topical cetirizine + dermarolling that I got a complement from my mother, asking what had I done to my hair, cause it looked thicker. The more my hair gets better, the more I forget that I have to take care of it and then I start to become lazy with any treatment, but then, I think after you get some volume back, you don't actually have to apply it every day, so if u skip 2 days in a week, it's not bad. Long story short, I dint have any side effects with cet, and was always comfortable to take it since people take it in a daily basis (orally). Compared to finasteride side effects, cet has none what so ever. I never noticed any shedding what so ever so that's a plus (maybe because it's not in a alcohol vehicle).
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Most people don't even relate any of these symptomes, and you can get them from anywhere really
Worst case scenario, you get a bad headache and you stop taking cet (no long or short term side effects)