Not sure if anyone could fill in the gaps here but I remember reading about this somewhere, just not sure what it said. I have been using Salbutamol and Atrovent nebs for a few days. Last night and today I have experienced the most painful cramps in my muscles (mostly legs and feet). The cramps are not easy to get rid off either. I am on all the usual meds I always take. Does this mean my potassium levels are rubbish again and is it just the low potassium causing the cramps or a combination of this and lower oxygen levels? My asthma is not particularly stable at the moment as I am still battling with very low morning peak flows and regular attacks during the day and night. This is just the transition into Autumn which causes havoc with my lungs.