Stop using celecoxib and call your doctor at once if you have a serious side effect such as: 1  chest pain, weakness, shortness of breath, slurred speech, problems with vision or balance; 2  black, bloody, or tarry stools;  coughing up blood or vomit that looks like coffee grounds;
To convert milligrams (mg) to milliliters (ml), the number of milligrams must be multiplied by the density of the liquid, which equals the volume in liters,and then divided by 1,000 to convert liters to milliliters. The density of each liquid is unique.
1 Adultsâ2000 milligrams (mg) every 12 hours. 2  ChildrenâUse and dose must be determined by your doctor. 3  For oral dosage form (tablets): 4  Adults, teenagers, and children weighing 40 kilograms (kg) or moreâ250 to 500 milligrams (mg) every 8 hours, or 500 to 875 mg every 12 hours.