| Features | |
| Acne | No |
| Active substance | Levothyroxine Sodium |
| Also known as | Levothyroxine sodium |
| Aromatization | No |
| Blood pressure | Can increase |
| Chemical name | Sodium (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate |
| Classification | Thyroid hormones |
| Dosage | 25-150 mcg/day |
| Dosage (medical) | 25-300 mcg/day |
| Dosage (sports) | Not typically used for athletic enhancement |
| Effects | Increases metabolic rate, stimulates protein synthesis |
| FORM | 100 tabs x 100 mcg |
| Formula | C15H10I4NNaO4 |
| Half-life | 6-7 days |
| HBR | Perhaps |
| Hepatotoxicity | No |
| Lab Test | Thyroid function tests (TSH, T4, T3) |
| Main action | Hormone replacement |
| Side effects | Heart palpitations, anxiety, sleep disturbances, weight loss |
| Storage conditions | Store at room temperature away from light and moisture |
| Substance class | Thyroid hormone |
| Trade name | Synthroid, Levoxyl, others |
| Use in sports | Rare, primarily for weight loss in some cases |
| Water Retention | No |
| Manufacturer | MERCK |