Amdipharm Mercury do 10 and 20mg Hydrocortisone tablets.
Viropharma do 5 and 20 mg modified release tablets called Plenadren.
It is not possible to be sure - some makes are still not listed in eMC (I think it should be a legal requirement). So there could be some other makes. Certainly at one time Hydrocortone from Merck Sharp & Dohme and Hydrocortisone from Auden Mckenzie Ltd were available.
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