Can I take my Synthroid at the same time (upon waking) as my metformin ?

Hello, Yes, it is perfectly appropriate to take your Synthroid in the morning at the same time as your Metformin. Taking Synthroid on an empty stomach (i.e. upon waking) improves the absorption of your medication. However, perhaps taking Metformin at breakfast (while eating) may improve your digestive tolerance vs. taking it on an empty stomach in the morning. If you are not bothered by this, continue as you are