Some muscle pains and fatigue are certain side effects. If you do not get it on time... missing it by an hour is unlikely to matter. Missing it by a day...

I suspect you should take normal doses and hope for the best. Second-stage Hinamizawa Syndrome for a day is much more bearable and lucid then Stage Five for any length of time.

(In other words, it's going to suck. But it's not going to suck as hard as continuing to miss doses.)