Endocrine System Channel
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Regular Insulin

Drug Interactions

Regular insulin can potentially interact with a number of other medicines (see Drug Interactions With Regular Insulin).

What If I Take an Overdose of Regular Insulin?

People who take too much of any type of 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 regular insulin, seek immediate medical attention.
(Click Humulin R Overdose or Novolin R Overdose for more information.)

Storage Methods

The recommended storage for each of the regular insulin brands and products may vary. In general, unopened vials should be stored in the refrigerator. Vials can be kept at room temperature or in the refrigerator once opened.
Regular insulin can be used only for a specific time after it is opened (this varies depending on the particular product). Check the patient information that comes with your insulin (or ask your healthcare provider) for more specific information.
Keep all forms of this insulin away from direct light or heat. Make sure to keep it out of reach of children.

Generic Availability

At this time, regular insulin is not available in generic form (see Generic Humulin R or Generic Novolin R).
Healthy Eating for People With Diabetes

Regular Insulin Information

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