Aug 16 • AFK study plan

AFK-pharmacology-high-yield-week-3-review

Master Your AFK Pharmacology: High-Yield Week 3 Review

As you prepare for the AFK exam, pharmacology often feels like an overwhelming mountain of data. However, success lies in understanding the "story" behind the medications rather than just rote memorization.
Today, we dive into three critical areas: Diabetes management, the complex world of enzyme induction/inhibition, and GIT therapeutics.

1. Diabetes Mellitus: Beyond Just Insulin

One common AFK exam trap is the misconception that insulin is used exclusively for Type 1 DM; in reality, it is frequently used to supplement insufficient secretion in Type 2 DM as well.
The High-Yield Classification of Antidiabetics:

Insulin: 

Categorized by onset and peak. Intermediate-acting NPH is commonly used due to its practical dosing schedule.

Sulfonylureas (e.g., Glyburide, Glipizide):

These are insulin secretagogues that block ATP-sensitive K+ channels to force insulin exocytosis.
Clinical Note: Glipizide and Glimepiride are safer for elderly patients or those with renal dysfunction.

Metformin (Biguanide): 

The ADA's initial drug of choice for Type 2 DM. It works primarily by reducing hepatic gluconeogenesis and increasing peripheral insulin sensitivity.
Unlike sulfonylureas, it does not stimulate insulin release and thus carries a lower risk of hypoglycemia when used as monotherapy

Thiazolidinediones (TZDs): 

These "sensitizers" (Pioglitazone, Rosiglitazone) act on PPAR-gamma receptors.
High-Yield Side Effects: Rosiglitazone is associated with increased cardiovascular risk, while Pioglitazone is linked to a risk of bladder cancer.

2. The "Transylvania Family": Drug-Drug Interactions

Understanding what the body does to the drug (pharmacokinetics) is essential for avoiding toxicities.
The liver’s Cytochrome P450 system is the "scary family" of enzymes that dentists must respect

Enzyme Inducers (The "Busy Street... CRAP GPS" Mnemonic):

These drugs (e.g., Carbamazepine, Rifampin, Alcohol [chronic], Phenytoin, Griseofulvin, Phenobarbital, Sulfonylureas) increase enzyme levels, thereby decreasing the plasma concentration and efficacy of other metabolized drugs

Enzyme Inhibitors (The "SICK FACES.COM" Mnemonic):

These drugs (e.g., Sodium Valproate, Isoniazid, Cimetidine, Ketoconazole, Fluconazole, Alcohol [acute], Chloramphenicol, Erythromycin, Sulfonamides, Ciprofloxacin, Omeprazole, Metronidazole) decrease enzyme levels, leading to potentially toxic concentrations of other drugs.

The Epinephrine AFK Exam Trap: 

For patients on non-selective beta-blockers, TCAs, or MAO inhibitors, you MUST limit epinephrine to a maximum of 36 mcg (roughly two cartridges of 1:100,000) to avoid a hypertensive crisis

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3. GIT Conditions: The Auxiliary Essentials

While often considered auxiliary, GIT pharmacology frequently appears in clinical scenarios
Peptic Ulcers:
Most are caused by H. pylori or chronic NSAID use. Triple therapy (PPI + two antibiotics like Amoxicillin and Clarithromycin) is the gold standard for eradication
PPIs vs. H2 Blockers: 
PPIs (Omeprazole) are superior, inhibiting acid secretion by over 90%. Cimetidine (H2 blocker) is a notorious enzyme inhibitor and must be used with caution alongside Warfarin or Diazepam
Chemotherapy-Induced Emesis:
This is mediated by both central (Vomiting Center) and peripheral (CTZ) receptors.
Ondansetron (5-HT3 antagonist) is a "go-to" medication for managing this distressing side effect

Stay Ahead of the AFK Exam!

Pharmacology is just the beginning of our journey. Follow us for the next few weeks as we dive deeper into high-yield topics like Local Anesthetics and Drug Interactions.

About the Author:

Dr. Mohamed is a licensed dentist in Canada who successfully passed both AFK and ACJ exams. After seeing too many talented international dentists fail due to poor study strategies, he created AFKStudyPlan to provide structured, evidence-based preparation. He's helped 342+ dentists pass their NDEB equivalency exams.
Have questions?
Email us at Info@afkstudyplan.com
or call 587-707-7068.

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