I have been taking "metoprolol succ er 25mg tasan" for about a year. I just picked up a refill and it is a much larger tablet, and the label reads "metoprolol succ er 25mg taeth." I would like to know the difference between the "tasan" and the "taeth." I am having trouble finding either of those on the internet.

Thanks

I just called my local CVS pharmacy with this same question. The pharmacist told me the "TA" means "tablet" and the "SAN" is the beginning 3 letters of the manufacturer. The "ETH" is another manufacturer. She described the letters on the old and new tablets, the TAETH being larger and football-shaped with a 369 on one side and the scoring mark on the other side. She assured me it is the same tablet but a different manufacturer and it was a company in the United States.

GeekyFlyGirl is correct. The suffixes and abbreviations scored on the tablets refer to the manufacturer and sometimes a serial number used to distinguish and identify the compound. SAN could be Sanofi, ETH may be Ethicon. The active ingredient and its excipient should be clearly stated on the label. "Succ" is short for succinate. Metoprolol succinate in a water solution at body temperature is going to dissociate in a way that offers you maximum bioavailability. Some actives are better combined with sulphates or other substrates to form a salt - (would any pharmacologists out there please check me on this?) Good luck with the nausea or vertigo or both...

My husband gets dizzy when taking metoprolol succinate but is fine when he takes metoprolol tartrate. He has to cut the succinate pill in half, but can take tartrate same mg fine. My guess is that this is due to the sudden release of succinate and slow release of tartrate. Does this seem reasonable? Any pharmacist?