Because of the recent shortage of metoprolol succinate
, my general practitioner refilled my prescription as metoprolol tartrate, but without informing me of the change. I was previously taking 25 mg in the am and 12.5 mg in the evening of the generic Toprol XL. Now I am taking 25 mg in the morning of generic Lopressor, and another 25 in the evening, but less than a full 12 hours apart. For example I will take the 25mg at 7 am, another 12.5 at 2pm and another 12.5 at around 6 or so.