Insulin Pens

nsulin pens are common in the United Kingdom, and are generally characterised by a different shape and the fact that they use an insulin cartridge as opposed to a vial.

Some insulin pens use replaceable cartridges, and others use non-replaceable cartridges and must be disposed of after being used.

Most insulin pens use replaceable insulin pen needles, which have become extremely short and thin.

The replaceable cartridges for insulin pens come in 3 and 1 ½ ml sizes, although 3 is more common and has become dominant. Prefilled insulin pens are disposed of when the insulin within the cartridge is used up. Prefilled pens are often marketed for type 2 diabetics who need to use insulin.