Minoxidil side affects oral vs topical. Which is more likely?

Hello Hairloss experts. Are the chances of side affects from minoxidil more from the topical or a low dose oral version? Let's say 1mg to 1.25mg oral vs 5% topical once a day. If one were to apply topical minoxidil is there a chance of higher side affects due to the fact that more of the foam will be used topically on the scalp and more can get absorbed vs a 1mg to 1-25 mg oral version.