HI,
I have a pacemaker and have been on 450mg of Rythmol for six years. My new cardiologist started me on the slow release form.

I took one 225mg Slow release yesterday morning. I took the second one last night. Twice I woke up breathing faster and then brought up about a table spoon of white foam. I went back to my 150mg/3 time a day this morning.

Does anyone know whether changing from the Rythmol to the Rythmol SR give any new side effects? - sam061