1. When insulin is not injected, it is better not to disassemble the pen holder, in case the screw is restored, and then load the used insulin, and normal dose exhaust cannot normally discharge insulin;
2. Improper preservation of insulin. Due to heat storage and cold shrinkage, air will enter the pen core, resulting in normal dose exhaust cannot normally discharge insulin.
3. regardless of injection insulin or exhaust, is to press the injection key, rather than rotating the injection key.
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