Diabetes Home > Humalog

What If I Take an Overdose?

People who take too much Humalog (or any other insulin) may experience symptoms such as:
  • Low blood sugar levels (hypoglycemia)
  • Fainting
  • Shakiness
  • A fast heartbeat (tachycardia)
  • Confusion
  • Sweating
  • Seizures
  • Coma
  • Loss of life.
If you happen to take too much, seek immediate medical attention.
(Click Humalog Overdose for more information.)

How Should Humalog Be Stored?

Unopened Humalog vials, KwikPens, and cartridges should be stored in the refrigerator. It is best to keep the vials refrigerated once they are opened, although they may be kept at room temperature (less than 77 degrees Fahrenheit). Once you start using a cartridge or KwikPen, you must not keep it in the refrigerator; it must be kept at room temperature. All forms of Humalog are good for up to 28 days once opened, after which you must discard any unused portion.
If you use the medication in an insulin pump, you must change the Humalog in the reservoir at least every seven days and change the infusion set (the reservoir, tubing, and catheter) and the insertion site at least every three days.

Available Strengths

Humalog is available in the following forms:
  • Humalog vials -- 10 mL, with 100 units of insulin per mL
  • Humalog cartridge (for use with a pen device) -- 3 mL per cartridge, with 100 units of insulin per mL
  • Humalog KwikPen prefilled pens -- 3 mL per pen, with 100 units of insulin per mL. 


Original Humalog prefilled pens will no longer be made as of January 2011. These older pen devices are being replaced by the KwikPen prefilled pen devices.


Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
List of references (click here):
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