Potentially Crappy Situation

I have taken this medication before, at least 10 times over the past 15 years. I never received this warning before. They stuck it on the top where it can't be ignored -- hmmm, must be important.  But -- and this is a big BUT -- "weeks to months" later?!?!  How on earth can I possibly correlate October diarrhea with June meds?  Also, note the lack of specificity if the late effect diarrhea is as severe as the initial ...