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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.
Top 10 Doctor insights on: Can You Have Water Before A Thyroid Blood Test. 1 Will drinking water with added electrolytes(smart water) effect a blood test that's being done to check thyroid levels. Told to fast before test. No: Water with electrolytes will not affect thyroid blood tests. However, you are wasting your money on such water. Tap water is just as good if not better.