Tens of thousands of allergy sufferers are in danger due to a UK shortage of the life-saving Adrenalin jab EpiPen. The Daily Telegraph has learnt the US manufacturer Mylan has begun warning pharmacists and patients in Britain that the country is the latest to be hit by global supply problems the devices. Epipen is the best known and most widely used of three adrenaline injectors available to allergy sufferers in the UK. Rival devices Jext and Emerade, produced… EpiPens work by reversing the life-threatening symptoms of severe anaphylaxis, which include a drop in blood pressure and constricted airways. Anaphylaxis left untreated can progress rapidly and be fatal if a person’s heart or breathing stops.