PTCE · Medications · 7 min read
Endocrine Drugs: Diabetes, Thyroid and Hormones
- Differentiate major classes of non-insulin and insulin medications for diabetes by mechanism of action, formulation, and safe storage requirements.
- Identify key indications, administration rules, and safety warnings for thyroid agents and systemic corticosteroids.
- Explain the indications, formulations, controlled substance status, and boxed warnings associated with reproductive hormones while defining the technician's role under pharmacist supervision.
Non-Insulin Oral and Injectable Diabetes Medications
Metformin belongs to the biguanide class and is considered a first-line oral medication for type 2 diabetes. It works primarily by decreasing hepatic glucose production and increasing peripheral insulin sensitivity. Metformin carries a boxed warning for lactic acidosis and should be taken with meals to minimize gastrointestinal adverse effects. Additionally, metformin may need to be withheld at or before an iodinated contrast procedure for patients with specified risk factors, such as impaired kidney function or intra-arterial contrast exposure, because reduced kidney function can increase the risk of metformin-associated lactic acidosis; the pharmacist follows product labeling and facility policy to ensure patient safety.
Other oral classes address blood glucose through distinct pathways. Sulfonylureas, including glipizide, glimepiride, and glyburide, stimulate the release of insulin from pancreatic beta cells, with hypoglycemia and weight gain being their most common adverse effects. Thiazolidinediones, such as pioglitazone, improve insulin sensitivity but carry a boxed warning for causing or worsening congestive heart failure. Dipeptidyl peptidase-4 (DPP-4) inhibitors, such as sitagliptin, saxagliptin, and linagliptin, end with the suffix '-gliptin' and help regulate glucose levels.
Sodium-glucose co-transporter 2 (SGLT-2) inhibitors, including empagliflozin and dapagliflozin, lower blood glucose by promoting urinary glucose excretion. Because these agents direct glucose into the urine, they carry an increased risk of mycotic genital infections, urinary tract infections, and volume depletion. Glucagon-like peptide-1 (GLP-1) receptor agonists, such as liraglutide and semaglutide, stimulate glucose-dependent insulin secretion and delay gastric emptying. Glucagon itself is an emergency agent available as an injection or nasal powder to treat severe hypoglycemia when an individual needs assistance, including when unconscious.
| Drug Class | Example Medications | Primary Mechanism or Feature | Key Safety Considerations |
|---|---|---|---|
| Biguanide | Metformin | Decreases hepatic glucose production; increases peripheral insulin sensitivity | Boxed warning for lactic acidosis; withhold before contrast procedures in high-risk patients; take with meals |
| Sulfonylureas | Glipizide, glimepiride, glyburide | Stimulate insulin release from pancreatic beta cells | Hypoglycemia and weight gain |
| Thiazolidinediones | Pioglitazone | Improves insulin sensitivity | Boxed warning for causing or worsening congestive heart failure |
| SGLT-2 Inhibitors | Empagliflozin, dapagliflozin | Promote urinary glucose excretion | Risk of mycotic genital infections, urinary tract infections, and volume depletion |
| GLP-1 Receptor Agonists | Liraglutide, semaglutide | Stimulate glucose-dependent insulin secretion; delay gastric emptying | Injectable or oral options requiring careful administration review |
Common mistakes
- Dispensing standard U-100 insulin syringes for concentrated U-500 regular insulin vials, which creates an extreme risk of a five-fold dosing overdose.
- Failing to separate levothyroxine administration from multivalent cations like calcium, iron, or antacids by at least 4 hours, resulting in poor drug absorption.
- Confusing look-alike and sound-alike insulin products, such as Humalog and Humulin; check the complete product name because these brand families also include premixed formulations, and Humulin R is available in different concentrations.
- Offering advice to patients regarding missed birth control doses or steroid tapering schedules instead of referring them immediately to the pharmacist for clinical counseling.
Key points
- Metformin is a first-line oral biguanide that lowers hepatic glucose production, carries a boxed warning for lactic acidosis, and may require temporary withholding prior to iodinated contrast procedures in high-risk patients.
- Other oral diabetes agents include sulfonylureas (which cause hypoglycemia and weight gain), pioglitazone (boxed warning for heart failure), DPP-4 inhibitors (suffix '-gliptin'), and SGLT-2 inhibitors (risk of urinary infections and volume depletion).
- Insulins range from rapid-acting (lispro, aspart, glulisine) to intermediate (cloudy NPH, rolled gently) and long-acting basal forms (glargine, degludec); unopened inventory requires refrigeration at 36°F to 46°F (2°C to 8°C).
- Levothyroxine (synthetic T4) is a narrow therapeutic index drug dosed in micrograms that must be taken on an empty stomach and separated from calcium, iron, and antacids by at least 4 hours.
- Systemic corticosteroids provide potent anti-inflammatory effects but can increase blood glucose and cause adrenal insufficiency if prolonged therapy is stopped without a clinician-directed taper.
- Combined hormonal contraceptives carry boxed warnings for smokers over 35, traditional norethindrone pills have a 3-hour late window, and testosterone is a Schedule III controlled substance with boxed warnings for secondary exposure virilization.
- Pharmacy technicians assist with technical order entry, stock maintenance, and standard auxiliary labeling, but must refer all clinical counseling, interaction checks, and final verifications to the pharmacist.
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