Inhaled insulin vs injections: What’s the difference and who is it for?

Taking insulin injections is a common method for managing diabetes, but a newer approach involves inhaling insulin through a specialized device. This method, known as inhaled insulin, delivers insulin powder directly to the lungs, allowing for rapid entry into the bloodstream and quick action on post-meal blood sugar spikes.

Dr S Satish Kumar, HOD & Lead Consultant – Endocrinology, Diabetology & Bariatric Medicine at Aster RV Hospital explains that inhaled insulin differs from traditional injections in several key ways. When inhaled, insulin bypasses the fat under the skin and is absorbed more rapidly into the bloodstream, reaching its peak effect within 10-15 minutes compared to the 30-minute delay of injectable rapid-acting insulin.

However, this quick-acting property comes at the cost of a shorter duration of action, making it unsuitable as a replacement for long-acting insulin injections.

Inhaled insulin is primarily used prior to meals to control post-meal blood sugar levels but should not replace basal insulin needs, which are typically met through injectable long-acting insulin. While it offers a needle-free alternative for some adults with type 1 or type 2 diabetes, it is not recommended for everyone. Individuals with lung diseases such as asthma, COPD, or chronic bronchitis, smokers, and those with unstable lung conditions should avoid inhaled insulin, as it could exacerbate their breathing problems.

The treatment also has limitations, including potential side effects like cough and throat irritation during the initiation of therapy, and challenges with precise dosing adjustments. Additionally, long-term lung safety remains uncertain, necessitating regular lung function assessments before and during treatment. Despite these considerations, inhaled insulin does provide a beneficial option for certain individuals, but it is crucial for patients to consult their healthcare provider before beginning any insulin regimen.