MedChem Pro
Mechanisms of Action
Detailed study guide for Medicinal Chemistry. Explore molecular pathways, receptor interactions, and drug classifications.
Antihistamines & Anti-neoplastics
Antihistaminic Agents
Respiratory / GIH1-Antagonists
Act as inverse agonists. Stabilize the inactive $H_1$ receptor conformation, preventing histamine-induced vasodilation and itching.
H2-Antagonists & PPIs
H2 blockers competitively inhibit binding on parietal cells. PPIs (Omeprazole) are prodrugs that form covalent bonds with $H^+/K^+$-ATPase.
Anti-neoplastic Agents
OncologyFocuses on DNA integrity and cell division inhibition.
Attaches alkyl groups to $N_7$ Guanine, causing cross-linking and apoptosis.
Bind to tubulin, inhibiting polymerization into microtubules (M-phase arrest).
CVD & Renal Agents
Anti-anginal Agents
CCBs: Block inward $Ca^{2+}$ flux through L-type channels, reducing afterload and contractility.
Diuretics Classification
Heart & Lipid Management
Cardiac Glycosides
Digoxin: Inhibits $Na^+/K^+$-ATPase → $\uparrow$ intracellular $Na^+$ → $\downarrow$ $Na/Ca$ exchange → $\uparrow$ $Ca^{2+}$ → Positive Inotropy.
Lipid Lowering
Statins: Competitive inhibition of HMG-CoA Reductase (the rate-limiting step in cholesterol synthesis).
Endocrine System
Key: Most steroids work via intracellular receptors to modulate gene transcription.
PDE-5 Inhibitors
Block cGMP breakdown in corpus cavernosum → Persistent smooth muscle relaxation.
Antithyroid
Propylthiouracil inhibits thyroid peroxidase, blocking iodine organification.
Diabetes & Local Anesthetics
Antidiabetic Pathways
- Sulfonylureas: Close ATP-sensitive $K^+$ channels → Depolarization → Insulin release.
- Metformin: Activates AMPK → $\downarrow$ Gluconeogenesis.
Local Anesthetics (LA)
LAs bind to the internal surface of voltage-gated $Na^+$ channels. They stabilize the channel in an inactivated state, preventing $Na^+$ influx and effectively blocking the generation and conduction of nerve impulses.
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