It seems that certain Asthma Meds may be Potassium depleters. This is bad and a big deal.
For example only, the Patient Information Leaflet for Fostair contains a related caution - though I gather Fostair is far from the only Med involved.
So why is this a big deal?
Arguably the two most important nutrients we need are Magnesium and Potassium.
UK and USA daily recommended intake for Potassium averages out at around 3.5 Grams (Yes Grams NOT Milligrams) a Day.
Chances are, 90% of People reading this are getting nothing like their recommended Potassium quota from their Daily Diets - note you can only 'safely' Suppliment up to around 100mg Potassium (get GP approval as Potassium via Supplementation can be risky).
Potassium is the primary reason we're constantly advised to consume 5 to 10 Portions of Fruit and Veg a Day, though - with the exception of Potassium Rich Bananas and Avocados - most fruit lags well behind Veg for its Potassium Content.
As well as helping to keep blood pressure and heart rhythm in check, Potassium has numerous other benefits and may assist in reducing some of the dangers related to atherosclerosis plaques that can clog arteries. As you know, Asthma is an Imflammatory Disease - making fruit and veg (rich in Potassium) one of your major allies.
You therefore don't want already inadequate levels of Potassium lowered by your Meds.
Although older folk may retain more Potassium than youngsters, if you are on long term Asthma Meds it may well be worth seeking a Test to see if your Potassium Levels are low (especially as you are almost certainly not getting sufficient Potassium from your daily diet). If you do nothing else, check your Patient Information Leaflets for all your Meds for any reference to Potassium.
I looked an numerous reliable websites for articles on Potassium Rich Foods and noted how much Potassium each food-type contained, with a view to correcting any Potassium shortfall in my diet (and to try to combat any Potassium Depletion due to Meds).
I could not believe how much fruit and veg you've got to eat to acquire the recommended daily amount. For example, a medium banana seems to provide around 100mg of Potassium per decent sized bite, so if you get six bites, that's 600mg of Potassium - around one sixth of your daily requirement. (6 Bananas a day anyone?) The calorie load alone would be massive, and I can't imagine eating all those bananas would do your digestive system and other bodily processes much good.
Do you have lots of fruit and veg for breakfast? Thought not. What about at lunch time (is your nose growing yet?).
So, for most of us, aside from the occasional apple (sorry, not much Potassium in apples) that leaves dinner. This means (minus your 'once daily' banana) you've got to find around 3 Grams of Potassium (five bananas worth) from the Veg you have with that meal. I have at least three veg with dinner and get nowhere near the 3 Grams shortfall from doing this.
At present I reckon I'm getting around 70% of my Daily Requirement though I'm trying to increase this. As well as Bananas, Avocado, lots of Green Leaf Veg, Lentils and Sweet plus Regular Spuds (skin left on each for the Potassium) I'm snacking on cherry tomatoes (at least 4 a day), raisins and drinking fresh orange juice. The Carbs and Sugar from some of this stuff (Bananas, Orange Juice, Avocado, Spuds, Lentils, Raisins etc) means I need to cut down on calories from some other foods.
Is it all worth it, most definitely - you really don't want low Potassium with the health issues that leaves you open to.
PS If you can't drop Salt, then Low Salt rather than regular salt can help (as it includes Potassium) but don't forget it still contains Sodium too, so don't increase your salt intake just because you're using Low Salt.