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Take Synthroid with water only on an empty stomach. Take Synthroid 4 hours before or after. taking iron or calcium supplements, or antacids. Soy, cottonseed meal, walnuts, fiber, and. grapefuit juice can affect the absorption of Synthroid.
From 1 week to 18 months depending on the substance. It all depends on your body, dosage and for how long you may have ran the anabolic steroid.