Nov 6, 2017 Most diarrhea will resolve within 24 to 48 hours—if it;s caused by viral (hyperthyroid) with too high of a dose leading to diarrhea. NSAIDs like ibuprofen (Advil, Motrin) and naproxen (Aleve) may cause both constipation and diarrhea. Keep an eye out for emails from GoodRx and see...