According to the FDA there is a shortage (unavailability, really) of verapamil ER in the U.S. The manufacturer stopped making it recently, I think in February 2019. It looks like it is not available in any strength.
This has been a miracle drug for me for cluster and I've run out and am now having a bad time. I'm going to have to try replacing it with regular verapamil. Does anyone know if there is a way to ask FDA to get verapamil ER made by another company, maybe as an orphan drug?