About a week ago I was prescribed a lower dose of levothyroxine by my physician and given a different brand by the pharmacy. At my appointment, I didn't even think to mention that I have been sensitive to brands or generic versions of levothyroixine that haven't been Synthroid in the past until I picked up my medication at the pharmacy. They gave me the brand Sanofi. I took the medication because I was out of Synthroid and unable to get hold of my doctor. Within a half hour to an hour of taking this medication so far, I have had mild slurring of my speech, difficulty swallowing, my heart feels like it is beating hard (this is a lower dose of medication not a higher one), confusion, forgetting what I am doing, my face is puffy, my rings feel tight on my fingers, I don't think I have a rash but my skin is itchy and a thirst I cannot seem to quench. By the end of the day, things get somewhat better and the next morning when I wake up I feel more like myself. I have been drinking around 10 liters of water every day for a week.
I thought maybe I was going through some severe withdraw reaction so I wanted to try and wait it out a little but this feels really different from lowered dose or when I have gotten a brand I am sensitive to. Emailed my doctor and his office for a callback on Friday, expecting one they will get in contact with me tomorrow.
Could this be a brand issue, withdraw or maybe an allergy? I have never had something happen so immediately before.
Any suggestions would be much appreciated.