Injection Site Rotation Planner
Rotating injection sites is easy to agree with and hard to do from memory. Choose the sites you use and how often you inject, and this planner lays out your next injections so each one moves to a different region and side, with every spot resting as long as possible before it comes round again.
Sites you use
Spots in rotation
6
Shortest rest for any spot
42 days
Regions
3
- 1Abdomen, leftDay 1
- 2Thigh, rightDay 8
- 3Back of upper arm, leftDay 15
- 4Abdomen, rightDay 22
- 5Thigh, leftDay 29
- 6Back of upper arm, rightDay 36
- 7Abdomen, leftDay 43
- 8Thigh, rightDay 50
- 9Back of upper arm, leftDay 57
- 10Abdomen, rightDay 64
- 11Thigh, leftDay 71
- 12Back of upper arm, rightDay 78
Within each spot, move at least an inch (about two fingers' width) from the last injection, and skip skin that is bruised, tender, scarred or hard. Use only the sites your medication's instructions list.
Use only the sites your medication's instructions list. Buttocks are off by default for that reason.
How the rotation is built
The planner follows the two rules behind most rotation advice: change region from one shot to the next, and give any single spot the longest possible gap before you use it again.
1. Regions take turns
Consecutive injections never land in the same region. With abdomen, thighs and arms selected, each region is used every third shot.
2. Sides alternate
Within each region the planner switches left and right, and offsets the regions so you are not injecting on the same side three times running.
3. More spots, longer rest
Splitting the abdomen into quadrants, or adding a region, lengthens the rest every spot gets. The planner shows the shortest rest any spot receives at your frequency.
Why rotation matters
Repeated injections into the same small patch of skin can cause lipohypertrophy: a thickened, rubbery lump of fat under the skin. It is usually painless, which is the trap, because the numb spot starts to feel like the comfortable spot. Medication injected into that tissue can absorb less predictably.
The fix is simple and the planner handles most of it. Change regions, alternate sides, and within a region move at least an inch from the last injection. Avoid skin that is bruised, tender, scarred, red or hard. Check your usual areas by touch every few weeks, comparing one side against the other.
For the reasoning in more depth, see the guides to injection site rotation and GLP-1 injection sites. If an injection site becomes hot, swollen, increasingly painful or starts to drain, that is a reason to contact your healthcare provider rather than a rotation question.
Frequently asked questions
More free calculators
Track this automatically with Pep AI.
Pep AI logs the site with every dose and suggests the next one from where you actually injected, so the rotation keeps up even when a shot moves days.
This calculator is provided for informational and educational purposes only and is not medical advice. Always confirm dosing with a qualified healthcare professional and double-check your own measurements before administering anything.
Built by the Pep AI team.