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Evidence-based GLP-1 & peptide discussion since 2023
ForumsSide Effects & ManagementSkin rash at injection site — July 2024 Page 2

Skin rash at injection site — July 2024

Dr.SleepRoch Tue, Dec 2, 2025 at 10:32 AM 9 replies 1,114 viewsPage 2 of 2
labquiet_amy
Senior Member
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6,789
Mar 2024
Cambridge, MA
Dec 2, 2025 at 12:27 PM#6
amsterdam_pete said:
I see both sides of injection-site reactions in my clinical practice.

Has anyone on injection-site reactions tried splitting their dose across two injection sites? My provider mentioned some patients do this at higher doses (2.4mg sema or 15mg tirz) to reduce injection site reactions.

I'm about to move to 15mg and want to minimize the lump that forms at the injection site.

10 5TrialNerd_Beth, HPLC_Greg, LibrarianMeg and 7 others
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Dr.PulmRoch
Member
456
2,345
Jun 2024
Rochester, MN
Dec 2, 2025 at 1:11 PM#7
Dr.SleepRoch said:
I have been getting a raised welt at the site that takes two or three days to settle, and it started long after I had supposedly got the technique…

Peptide degradation indicators for injection-site reactions — how to know if your medication has gone bad:

  • Visual: cloudiness, particles, color change (should be clear and colorless)
  • Tactile: unusual resistance when drawing up (viscosity change)
  • Efficacy: sudden loss of appetite suppression with same dose
  • Side effects: unexpected injection site reactions

If any of these occur, stop using the vial and open a fresh one. Document the issue and report to your pharmacy. Degraded peptides are at best ineffective, at worst potentially harmful due to degradation products.

9 4traveltech_sara, AttorneyGrant, DebRD_ATL and 6 others
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GenomicsKate
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Oct 2024
Cambridge, MA
Dec 2, 2025 at 1:55 PM#8
labquiet_amy said:
Has anyone on injection-site reactions tried splitting their dose across two injection sites?

Helpful tip for injection-site reactions needle anxiety: ice the injection site for 30 seconds before injecting. You'll barely feel the 30g needle go in. I went from dreading injection day to not even flinching.

Also, don't watch the needle enter your skin. Look away, take a deep breath, and it's over in seconds.

8 3MarkLI_maint, Dr.PeteFamMed, claudia_zurich and 5 others
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adam_van
Member
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890
Nov 2024
Vancouver, CA
Dec 2, 2025 at 2:39 PM#9

Following on from CarlaRPh_TPA — and this may be the naive question:

What did you change at the same time, and can you separate the two now?

7 2tommy_boulder, hyun_seoul, jim_asheville and 4 others
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Dr.SleepRoch
Senior Member
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Apr 2024
Rochester, MN
Dec 2, 2025 at 6:10 PM#10
GenomicsKate said:
Helpful tip for injection-site reactions needle anxiety: ice the injection site for 30 seconds before injecting.

For those on injection-site reactions — a practical guide to injection site rotation. I use a 4-site system:

  • Week 1: Right abdomen (2 inches from navel)
  • Week 2: Left abdomen
  • Week 3: Right thigh (outer, middle third)
  • Week 4: Left thigh

Then repeat. This gives each site 4 weeks to recover. I mark it in my phone calendar so I never inject the same area two weeks in a row.

9 7roxy_nash, tony_orlando, Dr.NephBHM_UK and 6 others
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