Synthroid is thyroid hormone T4....RX only. It is to raise your levels to a more normal reading.
You should start slowly....what dose did he give you? Typically people start at 25mcg or 50mcg and then get retested and raised a bit if needed then. If he has you start at 100mcg cold...I'd be concerned.
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Weezie looking at petunias 8.25.2017
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