Stomach flu or gastroenteritis infection signs and symptoms include nausea, vomiting, and diarrhea that lasts for about 7-14 days. The stomach flu is spread from person to person, usually via fecal to oral route from poor hand-washing or hygiene techniques.
Location: Egypt. Posts: 1,672. Re: How long for meds to take effect. It takes from 1 to 2 days in order for your high bp meds to work, but it reach its maximum effect in 1 week and some times it takes 2 weeks. They said that but I think it's only a week, not more than that.
usually u should start resonding to the treatment in 3-4 days but it takes 2-4 weeks to reach maximum effect. Hydrochlorothiazide belongs to a class of blood preesure lowering dugs called diuretics working to decrease blood volume so decrease blood pressure. Source(s): I am a Pharmacist. Shady N Â· 9 years ago.