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.
26 Followers. A. One milligram (mg) is equal to 1,000 micrograms (mcg). Therefore, if you were taking 300 micrograms of melatonin then you would need to find a product that is 0.3 milligrams of melatonin. The highest amount of melatonin found over-the-counter is 3 milligrams or 3,000 micrograms.6 Followers. A. One milligram (mg) is equal to 1,000 micrograms (mcg). Therefore, if you were taking 300 micrograms of melatonin then you would need to find a product that is 0.3 milligrams of melatonin. The highest amount of melatonin found over-the-counter is 3 milligrams or 3,000 micrograms.