Pharmacology: Major Drug Classes
Study the essential drug classes every nursing and pharmacy student needs to know — from beta-blockers to SSRIs, with mechanisms, uses, and key side effects.
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What is the primary mechanism of action for ACE inhibitors like lisinopril?
ACE inhibitors block the conversion of Angiotensin I to the potent vasoconstrictor Angiotensin II, leading to vasodilation and reduced blood pressure.
How do beta-blockers such as metoprolol affect the heart's workload?
They block beta-1 adrenergic receptors, decreasing heart rate and myocardial contractility, which reduces the heart's oxygen demand.
What is the primary mechanism of action for Selective Serotonin Reuptake Inhibitors (SSRIs)?
SSRIs inhibit the reuptake of serotonin into the presynaptic neuron, increasing the concentration of serotonin available in the synaptic cleft.
Which medication is used as a specific reversal agent for benzodiazepine overdose?
Flumazenil is a competitive benzodiazepine receptor antagonist used to reverse sedation and respiratory depression.
What is the primary mechanism by which penicillins exert their antibacterial effect?
Penicillins inhibit bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), preventing peptidoglycan cross-linking.
How do Calcium Channel Blockers (CCBs) like amlodipine lower blood pressure?
They prevent calcium ions from entering vascular smooth muscle cells, causing vasodilation and decreased peripheral vascular resistance.
What is the mechanism of action for HMG-CoA reductase inhibitors (statins)?
Statins inhibit the rate-limiting enzyme HMG-CoA reductase, which is responsible for the endogenous synthesis of cholesterol in the liver.
Why do ACE inhibitors often cause a dry, persistent cough in patients?
The inhibition of ACE prevents the breakdown of bradykinin and substance P, which accumulate in the lungs and trigger the cough reflex.
What is the cellular mechanism of action for benzodiazepines?
Benzodiazepines enhance the effect of the inhibitory neurotransmitter GABA by increasing the frequency of chloride channel opening.
How do opioid analgesics like morphine produce pain relief?
They bind to mu-opioid receptors in the CNS, inhibiting ascending pain pathways and altering the perception of pain.
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