What would happen if a female with a normal thyroid level took 200mcg Synthroid for weight loss?

What would happen if a female with a normal thyroid level took 200mcg Synthroid for weight loss? Would it make them go hyperthyroid if your thyroid is in the normal range? ALSO if you took it for a prolong period of time (say 3 months) would it permanently destroy your thyroid? What would happen to them?

Age:21
Female
Medications: None

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