Aspirin. A couple of aspirin can help fool a urine test. One study found that swallowing four aspirin about four to six hours before a drug test can change the results. Taking four aspirin may leave a person somewhat light-headed but unharmed. There is no solid evidence that commercial products that claim to disguise tainted urine work. It isn’t worth it to waste money on these products. Many are also very expensive and simply contain diuretics, a product that can be bought on its own for much cheaper. Stay away from these types of products if possible.
