Representative Drugs/Supplements That Interfere With Radioiodine (in Alphabetical Order)
| Name | Withdrawal time |
| Amiodarone | 3–6 mo |
| Antitussives | 2–4 wk |
| Bromides | 1 wk |
| Iodinates ointments | 2–4 wk |
| Levothyroxine (T4) | 4–6 wk |
| Lugol’s solution | 2–3 wk |
| Mineral/vitamin supplements | 2–4 wk |
| Nitrates | 1 wk |
| Perchlorate | 1 wk |
| Potassium iodide | 2–3 wk |
| Salicylates (large doses) | 1 wk |
| Steroids | Variable |
| Sulfonamides | 1 wk |
| Triiodothyronine (T3) | 2–3 wk |