Many older adults get too much levothyroxine (Synthroid, etc)

July 2011

Many older adults get too much levothyroxine (Synthroid, etc)...increasing their risk of atrial fibrillation and fractures.

Levothyroxine requirements decrease as people age...but doses are often not reduced accordingly.

Younger adults need about 1.7 mcg/kg/day of levothyroxine...but some seniors need only 0.5 mcg/kg/day.

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