Exam 4 Drugs Flashcards
(127 cards)
heparin
- drug class: indirect thrombin inhibitor
- indications: prevent venous thrombosis
- MOA: target - anti-thrombin III
+binds an activates antithrombin (conformational change)
+enhances activity 1000x
+catalyzes rxns without being consumed - tox:
+bleeding, HIT - monitoring: aPTT
- reversal agent: protamine sulfate - highly positively charged and binds heparin and inactivates it
- contraindications: active bleeding, hemophilia, thrombocytopenia, severe hypertension, ICH, infective endocarditis, active TB, GI ulcers, advanced hepatic disease
lmw heparin
- more specific for factor Xa (less effect on thrombin)
- less effective on coagulation in general
- more predictable plasma levels for monitoring
- examples include: enoxaparin, dalteparin, tinzaparin (-parin drugs)
fondaparinux (arixtra)
- pentasaccharide molecule of heparin
- synthetic
- not as effective; selective for factor X
- less bleeding risks involved
- indications: anticoagulation for people with HIT
- indirect thrombin inhibitor
protamine sulfate
* reversal agent for heparin
* highly positively charged; binds heparin and inactivates
* excess protamine is also anticoagulant
* less effect on LMW heparins
* does not affect fondaparinux
leprudin (hirudin) or bivalirudin (angiomax)
- drug class: direct thrombin inhibitors
- MOA: bind to both active and subtrate recognition sites of thrombin; prevents fibrin clot from forming
- hirudin - leech therapy
argatroban, dabigatran (pradaxa)
- drug class: direct thrombin inhibtor
- MOA: binds only to thrombin active sites (from biological sources); prevents fibrin clot from forming
warfarin
- drug class: direct thrombin inhibitor
- MOA: blocks the gamma-carboxylation of several glutamate residues (vitamin k dependent)
- onset: 8-12 hour delay in onset (heparin weaned off to warfarin)
- tox:
+hemorrhagic disorder in the fetus
+birth defects
+cutaneous necrosis - measured with INR (normal 0.8-1.2; target 2-3)
- reversal:
+d/c drug
+vitamin K
+FFP
+factor IX concentrates
rivaroxaban (xarelto), apixaban (eliquis)
- drug class: factor Xa inhibitors
- MOA: targets factor Xa
- indication: clot prevention
- no reversal agent
- effects: less bleeding issue d/t Xa specificity
- indication: CVA, VTE
tissue plasminogen activator (tPA)
- drug class: fibrinolytic
- recombinant forms: alteplase
- MOA:
+plasminogen activates to plasmin
+t-PA activates plasminogen that is bound to fibrin
+confines fibrinolysis to the formed thrombus and avoids systemic activation - indication: MI, PE
streptokinase
- drug class: fibrinolytic
- synthesized by Streptococci
- MOA: binds to plasminogen to activate it to promote fibrinolysis
- indication: MI, PE
urokinase
- drug class: fibrinolytic
- synthesized by the kidney
- MOA: lyses the thrombus from within
ASA
- drug class: COX-1 selective antiplatelet drug (effects both COX-1 and COX-2, but more selective for COX-1)
- MOA:
+TXA2 normally causes: PLT shape change, granule release, and aggregation
+ASA inhibits TXA2 synthesis, which will cause antiplatelet activity
+irreversibly binds to COX-1; this means that it inhibits the enzyme activity for the lifetime of the enzyme (8-10 days). - indication: arterial thrombosus
- adverse effects:
+GI upset
+buffering may decrease (d/t irritation of gastric mucosa and inhibition of GI protective PGG)
+increase in GI ulcers
+salicylate poisoning
+reye syndrome: hepatic injury and encephalopathy in children treated with ASA after a viral infection - can be used for colon/breast/prostate CA for anti-inflammatory properties & prevention
ASA toxicity graph:
mild: N/V, dizziness
moderate: N/V, tinnitus, HA, confusion, hyperventilation, tachycardia, fever
severe: delerium, hallucinations, seizures, coma, respiratory arrest
clopidogrel (plavix), ticlopidine (ticlid)
- drug class: antiplatelet aggregation
- MOA: irreversibly inhibits ADP receptors on PLTs; no effects on PGG metabolism
- can be released from drug-eluting stents with polymer coating
abiciximab
- drug class: IIb/IIIa receptor blocker
- MOA: antiplatelet aggregation by targeting IIb/IIIa-R complex (this receptor normally gets activated in the final common pathway)
vitamin k
drug class: factor replenisher
target: oxidation/reduction
MOA: carboxylation & 2 reductions will activate vitamin k to active form (hydroquinone
+confers activity on prothrombin (II), VII, IX, and X
indications: warfarin OD, vit K deficiency
fresh frozen plasma (FFP)
drug class: factor replenishment
target: multiple
result: normal clotting cascade
indications: hemophilia
desmopressin
- increased factor VIII activity
- indications: mild hemophilia A, von-willebrand disease
aminocaproic acid
drug class: fibrinolytic inhibitor
MOA: competitively inhibits plasminogen activation
result: stablized clot
indication: post-op
tranexamic acid (TXA)
drug class: fibrinolytic inhibitor
MOA: inhibits plasminogen conversion to plasmin
indication: trauma, heavy menstrual bleeding, postpartum, epistaxis
decreased risk of death in major bleeding
lispro, aspart, glulisine
rapid acting insulins
bolus insulin
novolin, humulin
short acting (regular) insulin
acts fast; leaves fast (longer acting than RA)
NPH
neutral protamine Hagedorn
intermediate acting
glargine, detemir
long acting insulin
metformin
- drug class: biguanide (two guanine molecules)
- fist line therapy for NIDDM (type II)
- MOA: **reduces hepatic glucose production **
- 500 mg prandial
- GI toxicities