Diabetes Pharmacology: Insulin, Metformin, and the Glucose Supply Chain
Glucose is the primary fuel for the cell factory. Insulin is the key that unlocks the cell membrane gate to let glucose in. When the key is missing (Type 1) or the lock is broken (Type 2), glucose piles up in the bloodstream while the factory starves. That one mechanism explains every diabetic cue and every medication action.
| Drug / Class | Mechanism at the Factory | Key LPN Cues to Monitor |
|---|---|---|
| Insulin (rapid, regular, NPH, long-acting) | Directly provides the key to open glucose gates | Hypoglycemia (BG <70): diaphoresis, shakiness, confusion, tachycardia |
| Metformin (biguanide) | Decreases glucose production by the liver factory; increases peripheral glucose uptake | Lactic acidosis risk: hold before contrast dye procedures; N/V, muscle pain |
| Glipizide, Glyburide (sulfonylureas) | Stimulates pancreatic beta cells to release more insulin | Hypoglycemia risk — especially with skipped meals; report BG <70 |
| Sitagliptin (DPP-4 inhibitor) | Increases incretin hormones → more insulin released after meals | Upper respiratory infections; pancreatitis (severe abdominal pain = report) |
| Empagliflozin (SGLT-2 inhibitor) | Blocks glucose reabsorption in kidneys → glucose excreted in urine | UTI risk, genital yeast infections, DKA risk even with normal glucose |
Insulin is always on the high-alert medication list. Two-nurse verification is required before administration in most facilities. Never shake insulin — roll NPH gently. Mix insulin by drawing clear (regular) before cloudy (NPH). Know the onset/peak for each type — that is when hypoglycemia risk is highest.
Rapid-acting (lispro, aspart): onset 15 min — give immediately before or with meals. Regular: onset 30–60 min — give 30 min before meals. NPH: peak 4–12 hours. Glargine/Detemir: no peak — basal only, do not mix.
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NursingAcademics is built around the Cell Factory Method from Phase 1 through Phase 3. Every system, every medication, every cue is explained through the same equation.
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