From a quick search the diproprionate seems to be in a steroid cream or nasal spray. The sodium phosphate in steroid tablets. But in the UK steroid tablets are usually prednisolone, particularly in most asthma treatment. Sometimes hydrocortisone. I suspect betamethasone is not used very often in UK asthma treatment.
there is a betamethasone dipropionate injection it super potent just 2mg im injection treated my severe asthma several times in my country, I took betamethasone from uk 2 mg injection but it did nothing with my asthma, after I read leaflet I found it contain betamethasone sodium phosphate only, I don't know why my asthma response very quickly to betamethasone dipropionate and don't response to other corticosteroids, I start asthma 10 months ago but it still persist
In the UK though, injected steroids are usually only used in acute asthma (such as needing emergency hospital treatment). Even in properly severe asthma people don't really have injected steroids at home.
However many people do have oral versions, like prednisolone. Mostly as required for flare ups. Severe asthmatics might have them every day but the idea is to be controlled on inhalers and other medication because long term steroids have big negative side effects.
If you are not controlled you need to ask your GP to refer you to a consultant. They will investigate if anything else is going on (a lot of people have things as well as their asthma which feel like asthma but are not asthma and don't get better with asthma medications). They will also find the right medication for you.
Are you taking Fostair? That's beclomethasone dipropionate. It's similar to, but not quite the same as, betamethasone which appears to be generally used for skin conditions in the UK. Beclomethasone is what is generally used for asthma here not betamethasone (and of course other inhaled steroids may also be used).
Twinkly has already answered re the other parts, but just wanted to clarify that beclomethasone and betamethasone are not quite the same. As she says, steroid injections are not used for day to day asthma treatment in the UK. In hospital, you may get a steroid injection for an attack but that would usually be hydrocortisone (or sometimes methylprednisone).
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