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Avoiding difficulties during injection

ProblemPossible causeRecommended action
Painful injection Multiple use of pen needles Change the pen needle after each injection
Insulin flows back from injection channel Pen needle removed too fast (incomplete insulin delivery) Inject slowly and do not remove the pen needle immediately (leave needle in subcutaneous fatty tissue for 10 seconds)
Injection too fast, insulin was unable to distribute
Lacking efficacy of insulin Unsuitable injection site: tissue hardening (lipohypertrophy), scar tissue, hardening of skin Avoid unsuitable sites
Pen needle removed too fast after injection Inject slowly and do not remove the pen needle immediately (leave needle in subcutaneous fatty tissue for 10 seconds)
Poor mixing of insulin in cartridge (only in case of cloudy insulins) Gently shake the pen several times before every injection
Pen needle is clogged Use a new pen needle and use every pen needle only once
The dosage button of the pen cannot be pressed Rubber membrane of the cartridge was not pierced Use a new pen needle. Change the pen needle after each injection
Pen needle too loose Ensure that the pen needle is securely fixed
Pen needle is clogged Use a new pen needle and use every pen needle only once