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Pharmacology – Final Exam Review – Drug Classifications, Mechanisms, and Nursing Considerations

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This document offers a complete review for the final exam in Pharmacology, covering major drug classes, mechanisms of action, side effects, contraindications, and nursing responsibilities. It is ideal for nursing and healthcare students preparing for cumulative exams or licensure tests. The content is organized for quick reference and effective memorization to enhance clinical readiness and exam performance.

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Oral Hypoglycemics

Sulfonylureas:

 Glipizine (Glucotrol)

Action: Promotes the release of insulin from the pancreas

Risk: Risk of hypoglycemia in clients with renal, hepatic or adrenal disorders. Usually caused by
taking too much medication or not eating enough food.
 Give 30 mins before morning meal

Meglitinides:

 Repaglinide (Prandin)

Action: Stimulates beta cells to release insulin

Risk: Short acting (2-4 hours); administer before each meal; risk of hypoglycemia

Biguanides:

 Metformin (Gulcophage)

Action: Reduces gluconeogenesis; makes muscle tissue more sensitive to insulin
 Does not promote insulin release from pancreas
Risk: Withhold 48 hours and 48 after a test with contrast media. Contraindicated for clients with
severe infections.
Monitor for Lactic Acidosis

Thiazolidinediones:

 Rosiglitazone (Avandia)

Action: Decreases cellular insulin resistance; Make take 3-4 months of therapy

Risk: Exacerbation of heart Failure (Fluid retention, headache, weight gain) DO NOT USE
WITH PT WITH HEART FAILURE, DUE TO FLUID RETENTION

,Alpha- Glucosidase Inhibitors:

 Acarbose (Precose)

Action: Slows carbohydrate absorption and digestion

Risk: Contraindicated in clients with intestinal disease due to increase gas formation
 Take with the first bite of each meal 3x a day

Gliptins:

 Sitagliptin (Januvia)

Actions: Promotes release of insulin, lowers glucagon secretion and slows gastric emptying

Risk: Caution with impair renal function- dose will be reduced

Injectable Hypoglycemics

Insulin:

 Rapid: Lispro (HumaLOG): Onset (15-30 mins) Peak (0.5- 2.5 hours) Duration (3-6 hrs)
 Short: Regular (HumuLIN): Onset (0.5-1 hrs) Peak (1-5hrs) Duration (6-10hrs)
 Intermediate: NPH (Humulin N): Onset (1-2 hrs) Peak (6-14 hrs) Duration (16-24 hrs)
 Long: Glargine(Lantus): Onset(70mins) Peak (None) Duration (24hrs)

***Mixing regular and NPH= Regular 1st & then Nph
*** Administer Long acting ad bedtime
*** Only regular insulin can be given IV with normal saline

Side effects: Hypoglycemia/Hyperglycemia

Nursing interventions: Roll vial; do not shake

, Thyroid Replacement


 Levothyroxine T4 (Synthroid)

Action: Stimulates metabolism of all body systems by accelerating the rate of cellular
oxygenation

Therapeutic use: HYPOthyroidism
Precautions: Overmedication can result in Hyperthyroidism
Side effects: Tachycardia
Weight loss
Diarrhea
Weight loss
Decreased bone density
Heat intolerance
Insomnia
Nursing Interventions: Monitor cardiac system
Monitor T4 and TSH levels
Take early in the morning

 Monitor for fatigue, slow speech, hoarseness or slow pulse; May indicate under medication


Anti-Thyroid Drugs


Propylthiouracil:

 Propylthiouracil (PTU)

Actions: Interferes with synthesis of T3 used for rapid improvement
Use: Hyperthyroidism
Adverse effects: Rash and Leucopenia (Most common) Significant Bradycardia

*** Administer at the same time everyday preferably in the morning to decrease the potential of
insomnia

, Radioactive Iodine:

 Iodine-131 (131l, Iodotope)

Action: At high dose: Hyperthyroidism
Thyroid cancer
Clients who have not responded to anti-thyroid treatment

At low dose: Thyroid function studies

Complications: Monitor for radiation sickness, monitor for Anemia

Nursing Considerations: -Maintain distance of 6ft from others do not prepare food for other or
share utensils
-Instruct the client to increase fluid intake
-Give with fruit juice to dilute the unpleasant taste
-Ask about iodine salt and shell fish intake
-Assess for irregular bleeding

Drug therapy for peptic ulcers


Histamine2-receptor antagonists:

 Ranitidine hydrochloride (Zantac)

Action: Blocks H2-receptors in stomach to decrease acid production/secretion of acids

Side effects: Headache is the most common severe reduction of WBC, RBC, Platelets is
possible. In high doses may cause impotence or loss of libido in men.

Nursing Considerations: Administer after meals and monitor liver and renal function. Tell the
patient that smoking decreases the effectiveness of the medication.


Proton pump inhibitors:

 Omeprazole (Prilosec)

Action: Reduces acid secretion in stomach
Side Effects: Headache, nausea, diarrhea, rash, abdominal pain

Nursing Interventions: Give at breakfast on empty stomach, Gingko and St. Johns
contraindicated Zollinger- Ellison drug of choice

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