Synthroid Dose Calculator Based on Weight
Based on the search results, I’ve compiled a comprehensive table summarizing Synthroid (levothyroxine) dosages based on age groups and weight. This table provides a quick reference guide for Synthroid dosing:
| Age Group | Synthroid Dose (mcg/kg/day) |
|---|---|
| 0-3 months | 10-15 |
| 3-6 months | 8-10 |
| 6-12 months | 6-8 |
| 1-5 years | 4-6 |
| 6-12 years | 2-5 |
| 12-18 years (growth and puberty incomplete) | 2-3 |
| Adults and children >12 years (growth and puberty complete) | 1.6-1.7 |
It’s important to note the following key points about Synthroid dosing:
- Dosages are typically given in micrograms (mcg) per kilogram (kg) of body weight per day23.
- The dosage for adults and children with completed growth and puberty is usually around 1.6-1.7 mcg/kg/day, but may be lower in older adults12.
- Doctors usually start with a lower dose and adjust it over time based on the patient’s response and lab results23.
- For patients with certain conditions, such as those at risk for atrial fibrillation or with underlying cardiac disease, a lower starting dose may be used3.
- Dosages greater than 200 mcg/day are seldom required, and an inadequate response to daily dosages greater than 300 mcg/day is rare3.
- For treating thyroid cancer in adults, the dose is usually more than 2 mcg/kg/day, but this should be determined by a doctor1.
- Dosage adjustments are typically made every 4-6 weeks for adults, or every 6-8 weeks for those at risk of cardiac issues3.
Remember that this table serves as a general guide. The actual dosage prescribed may vary based on individual factors, including the severity of hypothyroidism, age, weight, and other medical conditions. Always follow the specific dosage instructions provided by your healthcare provider.