Again, on my experience and reading, I believe many may get sufficient medication taking Atenolol once a day, in general this is not the case with Metoprolol
Tartrate (normal
release). There is a higher cost slow
release version of Metoprolol. My interest in Atenolol was more than the half-life of the medication. As you may have read my experience so far confirms the Atenolol is longer lasting in my body... only one sample, others may get different results.