If hypoglycaemia (low blood sugar) or hyperglycaemia (high blood sugar) is not treated they can be very serious and cause headaches, nausea, vomiting, dehydration, unconsciousness, coma or even death (see A and B in section 4 “Possible Side Effects”). • Always keep spare syringes and a spare vial of Humalog Mix50, or a spare pen and cartridges, in case you lose your pen or cartridges or they get damaged. • Always carry something to show you are diabetic. • Always carry sugar with you.