Injection Site Rotation and Lipohypertrophy: A Practical Guide
Repeated injections in the same spot can cause lipohypertrophy — a lump of thickened tissue that can affect drug absorption. Rotation is the standard prevention.
By the GLP Semaglutide editorial team · Last updated August 15, 2025
Lipohypertrophy is a buildup of fatty tissue that can develop at repeated injection sites, a well-documented issue in long-term insulin therapy that also applies to weekly GLP-1 injections over time.
Why rotation matters
Injecting into lipohypertrophic tissue can lead to inconsistent drug absorption, which may affect how predictably a dose works. Product labels generally recommend rotating between the abdomen, thigh, and upper arm, and varying the exact spot within each area.
Checking your own injection sites
Periodically looking at and feeling injection areas for lumps or thickened skin, and mentioning any findings to a prescriber or pharmacist, is a reasonable habit — this guide isn't a substitute for that in-person check.
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