Introduction to Pharmacology

Overview

• Instructor: Medicosis Perfectionis
• Focus on making pharmacology & medicine easily understandable.
• Topics covered include general pharmacology, systemic pharmacology, and more.

General Pharmacology

Pharmacokinetics (ADME)

• Absorption: How a drug passes through membranes to enter the bloodstream.
  • Common sites: Gut, lungs, mouth, vaginal, rectal.
• Distribution: Movement from blood to tissues.
  • Only free, unbound drugs are active.
• Metabolism: Conversion from active to inactive or vice versa.
  • Primarily occurs in the liver.
  • Prodrugs are initially inactive.
• Elimination: Removal from the body via urine, stool, bile, sweat, or breath.

Pharmacodynamics

• What the drug does to the body.
• Drug-receptor interactions, agonists vs. antagonists.
• Receptor affinity and drug effectiveness.

Systemic Pharmacology

Autonomic Pharmacology

• Autonomic Nervous System: Sympathetic (fight or flight) and Parasympathetic (rest and digest).
• Sympathetic effects: Increased heart rate, pupil dilation, bronchodilation.
• Parasympathetic effects: Decreased heart rate, pupil constriction, increased digestion.

Neuropharmacology

• Focus on central nervous system drugs.
• Neurotransmitters: Excitatory (Glutamate, Aspartate) vs. Inhibitory (GABA, Glycine).

Cardiovascular Pharmacology

• Antiarrhythmics: Treat heart rhythm disorders.
• Antihypertensives: Lower blood pressure.
• Diuretics: Increase urine output to decrease blood pressure.
• Positive Inotropes: Increase heart contraction strength.

Endocrine Pharmacology

• Hormone Replacement Therapy (e.g., estrogen after menopause).
• Hormones and their regulatory mechanisms (e.g., Growth hormone, ACTH, TSH).

Chemotherapy

• Cell Cycle Specific Drugs: Target specific phases of cell division.
• Cell Cycle Non-Specific Drugs: Broad action across cell cycle phases.
• Common side effects: Hair loss, bone marrow suppression.

Toxicology

• Study of toxins and their effects.
• Importance of therapeutic index and potential for drug overdose.
• Acute management strategies (ABCs, specific antidotes).

Autocoids and Eicosanoids

• Involves paracrine and autocrine signaling.
• Prostanoids, leukotrienes from arachidonic acid metabolism.

Antibiotics/Antimicrobials

• Antibacterials: Target bacteria specifically.
• Antifungals, Antivirals, Antiparasitics: Broader term "antimicrobials".
• Importance of understanding drug interactions and resistance.

Learning Resources

• 250+ videos available in Medicosis’s Pharmacology Playlist.
• Additional detailed courses available on Medicosis's website.

Additional Tips

• Understand the symbols and abbreviations used in pharmacology.
• Importance of knowing drug solubility, routes of administration, and effects on different body systems.