tests are done to look for drug
dependence and abuse and usually test for morphine, nicotine, alcohol, LSD, marijuana, cocaine etc. If you took an antacid, then this will not show up in a drug test. Also this is nothing to be worried about. You an even inform the person who is testing that you took an antacid. An antacid is not a substance abuse material. However, if you took it to overcome acidity due to alcohol or smoking then yes those things will sow up. Take care!