I take a compounded form of Levothyroxin since I am unable to take it as mass produced due to it causing heart arrhythmia. However, even with the compounded form I do get terrible heat flashes especially for a couple of hours after taking them in the morning and by afternoon and evening I’m fine. I know it has to be this since it is the only thing new or different that I do in the mornings. I live with it though because of the other benefits. I wish it didn’t cause this. Fortunately, I don’t get sweaty, just intense feelings of over heating multiple times each morning. I have tried different mcg levels and the higher I go the more I get them so I have to keep my mcgs low like between 13-19 mcg. Any higher and I also have tummy trouble.