An insulin pen is a convenient and discreet method for diabetes patients to take prescribed insulin medication. These devices resemble a fountain pen and are disposable or have replaceable insulin cartridges.

A short, thin needle at the end of the pen is used to inject the insulin. A small dial allows the individual to select the exact dosage needed. Pens carry 150 or 300 units of insulin.

Insulin pens may be a good option for diabetes patients who are traveling, and can be used and stored easily at work or school. Their convenience and ease of use also may make them good options for certain populations, such as children and elders.