How to use Iversun Take this drug orally with a full glass of water (8 ounces or 240 milliliters) at least an hour before a meal, preferably on an empty stomach. Iversun is typically administered as a single dose, a course of doses, or as prescribed by a physician. Your weight, health, and treatment response all factor into the dosage. If your issue persists or worsens, let your doctor know....