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Yes, you can take your medicine. If you need to be fasting, you must be having your cholesterol or blood sugar tested. You can take your medicines and have normal amounts of water to drink, even up until right before you have your blood drawn.
You can take tea in a thermos to drink after the blood test. Photo Credit Jupiterimages/Pixland/Getty Images. When your physician orders certain tests, you may need to fast for several hours prior to the test assure accuracy. Nutrients in the foods you eat and beverages you drink can influence test results. For some tests, even the stimulation of digestion enzymes interferes with test results. The amount of time you need to fast can vary between eight and 12 hours. Glucose and cholesterol tests are examples of blood tests that require fasting. A fasting blood test requires that you avoid eating or drinking anything except water for a certain period of time before your blood test.