Philippa,

Those are definitely symptoms associated with Flecainide. If your dose is still the same, then there may be something else affecting you like heat. Since Flecainide can lower potassium levels (which causes weakness) you may be losing more than normal through sweat or some other factor.

You might want to try drinking some juice or eating fruit when you feel that way and see if it helps. Getting a little extra salt might be beneficial, too. One of the best electrolyte fixes is watermelon with a little salt sprinkled on it :-)

Jan

Type of Myotonia: Thomsen's

Country: US