Pharm

Comprehensive Pharmacology Exam Study Guide

This study guide synthesizes essential pharmacological principles, focusing on renal and endocrine drug therapies, laboratory monitoring, and safety protocols.

Core Pharmacology Foundations: Safety and Monitoring

Success in pharmacology requires a "safety first" mindset, prioritizing the identification of organ dysfunction through laboratory data and recognizing common drug themes.

Organ-Specific Laboratory Monitoring

Clinicians must monitor specific lab values to detect potential drug-induced dysfunction or to evaluate therapeutic effectiveness.

Organ/Condition

Relevant Laboratory Tests

Kidney

Blood Urea Nitrogen (BUN), Creatinine

Liver

Bilirubin, Aspartate Aminotransferase (AST), Alanine Aminotransferase (ALT)

Infection

White Blood Cell (WBC) count

Anemia

Red Blood Cell (RBC) count, Hemoglobin (Hgb), Hematocrit (Hct)

Bleeding

Platelet count

Pharmacological Suffixes for Drug Classification

Recognizing suffixes helps identify the drug class and its primary function.

  • -amil / -pine: Calcium channel blockers

  • -caine: Local anesthetics

  • -dine: Anti-ulcer (H2 histamine blockers)

  • -done: Opioid analgesics

  • -ide: Oral hypoglycemics

  • -lam / -pam: Anti-anxiety agents

  • -oxacin: Broad-spectrum antibiotics

  • -micin / -zide: Diuretics

  • -mycin: Antibiotics

  • -nuim: Neuromuscular blockers

  • -olol: Beta blockers

  • -pril: ACE inhibitors

  • -sone: Steroids

  • -statin: Antihyperlipidemics

  • -vir: Anti-virals

General Safety and Drug Interactions

  • Side Effects (SE): Minor, expected effects on body cells that are not the intended action. They vary in intensity by patient.

  • Adverse Effects (AE): Harmful, severe effects with the potential for tissue damage or serious health problems; often occur with high doses or long-term use.

  • Safety Rules:

    • Always check for sulfonamide allergiesand photosensitivity.

    • Monitor for Stevens-Johnson Syndrome and bone marrow suppression.

    • Common Interactions: Avoid St. John's Wort, Grapefruit Juice, and Warfarin (Coumadin) unless specifically managed.

    • Urine Discoloration: Anticipate this as a non-harmful side effect for certain medications.

Chapter 12: Diuretics and Overactive Bladder

Diuretics increase urine output to reduce blood volume and lower blood pressure. They function by slowing or turning off sodium pumps in the nephron.

Diuretic Classifications

Class

Primary Mechanism & Site

Common Medications

Key Considerations

Thiazide Diuretics

Slows sodium pumps in the distal convoluted tubule.

Chlorothiazide (Diuril), Hydrochlorothiazide, Metolazone (Zaroxolyn).

Check K+ levels (notify if < 3.5); monitor for hypercalcemia and hyperuremia.

Loop Diuretics

"High ceiling" diuretics; stops sodium pumps in the ascending loop of Henle.

Furosemide (Lasix), Bumetanide (Bumex), Torsemide (Demadex).

Ototoxic(hearing loss); highly potent; causes calcium loss.

Potassium-Sparing Diuretics

Prevents potassium loss by returning it to the blood; works in the collecting duct.

Spironolactone (Aldactone), Triamterene, Amiloride.

Risk of hyperkalemia; avoid salt substitutes; check for hirsutism (women) or breast enlargement (men).

Diuretic Nursing Priorities

  • Before Administration: Check serum potassium (notify if < 3.5) and sodium (notify if < 135). For thiazides, listen to the apical pulse for a full 60 seconds to detect irregularities.

  • Ototoxicity: Loop diuretics (especially Furosemide) must be given slowly (no more than 20 mg/min IV) to prevent hearing loss, particularly if the patient is also taking aminoglycoside antibiotics.

  • Patient Education:

    • Change positions slowly due to orthostatic hypotension.

    • Report new muscle weakness, irregular heartbeats, or ringing in the ears (tinnitus).

    • For Loop/Thiazide: Eat K-rich foods (bananas, citrus, avocados).

    • For Potassium-Sparing: Avoid excessive K-rich foods and salt substitutes.

Overactive Bladder (OAB) Therapy

OAB is caused by the detrusor muscle contracting spastically before the bladder is full.

  • Urinary Antispasmodics: Oxybutynin (Ditropan), Tolterodine (Ditrol), Solifenacin, Trospium Chloride.

  • Intended Response: Decrease urinary frequency, urgency, and incontinence.

  • Safety/Teaching:

    • Heat Stroke Risk: These drugs decrease perspiration; avoid overheating.

    • Administration: Best on an empty stomach with water.

    • Oxybutynin Patch: Apply twice weekly (every 3-4 days) to the abdomen, hip, or buttock; rotate sites.

Chapter 21: Antidiabetic Drug Therapy

Diabetes management focuses on maintaining blood glucose levels within the normal range to prevent long-term complications.

Core Drug Classes

  • Insulin: Essential for Type 1; used for Type 2 when oral meds are insufficient.

  • Insulin Stimulators: Trigger the pancreas to release more insulin.

  • Biguanides (Metformin): Reduces glucose production by the liver and improves insulin sensitivity.

  • Insulin Sensitizers (Thiazolidinediones):Improve the body's response to insulin.

  • Other Classes: Alpha-Glucosidase Inhibitors, Incretin Mimetics (GLP-1 Agonists), DPP-4 Inhibitors, and SGLT2 Inhibitors.

Symptom Recognition

Hyperglycemia (High Sugar)

Hypoglycemia (Low Sugar)

Hunger, frequent urination, blurry vision, thirsty, tingling limbs.

Shaky, fast heartbeat, sweaty, anxious, hungry, headache, weak/tired.

Chapter 22: Thyroid and Adrenal Gland Disorders

Hormones from these glands are essential for life and regulate metabolism and stress responses.

Thyroid Disorders1. Hypothyroidism (Underactive Thyroid)

  • Symptoms: Slow metabolism, cold intolerance, weight gain, constipation, thick tongue, lethargy, "waxy" skin. Myxedema is the severe, emergency form.

  • Drug Therapy: Thyroid Hormone Agonists (Levothyroxine/Synthroid, Liothyronine).

  • Nursing Education:

    • Empty Stomach: Take 2–3 hours before or 3 hours after a meal (usually early morning).

    • Cardiac Warning: Meds increase heart activity; report chest pain or a pulse rate 20 bpm higher than normal.

    • Lifelong Therapy: Do not stop suddenly.

    • Interactions: Increases the effects of Warfarin (Coumadin), leading to bleeding risks.

2. Hyperthyroidism (Overactive Thyroid)

  • Symptoms: Rapid metabolism, heat intolerance, tremors, diarrhea, weight loss, bulging eyes (exophthalmos). Thyroid Stormis the life-threatening extreme.

  • Drug Therapy: Anti-thyroid drugs (Methimazole, Propylthiouracil/PTU).

  • Nursing Education:

    • Liver/Bone Marrow Safety:Methimazole and PTU are hepatotoxic (check for yellow eyes/skin) and cause bone marrow suppression (avoid crowds; report infection).

    • Delayed Action: May take 3–4 weeks for symptoms to improve as existing hormones are used up.

Adrenal Gland Disorders1. Adrenal Insufficiency (Addison's Disease)

  • Symptoms: Hypoglycemia, salt craving, hypotension, high potassium (hyperkalemia), and low sodium (hyponatremia).

  • Drug Therapy: Corticosteroids and Fludrocortisone (replaces aldosterone).

  • Safety: Fludrocortisone reverses electrolyte imbalances, potentially causing low potassium and high sodium. Monitor for Congestive Heart Failure (CHF).

2. Adrenal Hyperfunction (Cushing's/Hyperaldosteronism)

  • Treatment: Surgery is primary. Drugs like Spironolactone (aldosterone antagonist) or Mitotane (cortisol inhibitor) are used if surgery is not an option.

  • Critical Safety Point: Drugs can over-suppress the glands, leading to acute adrenal insufficiency (hypoglycemia, weakness, salt craving). Notify the prescriber immediately if these symptoms appear.