Exam 4 Drugs Flashcards
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
sulfonylurea
ex) glipizide (2nd gen)
- drug class: insulin secretagogue
- MOA: binds to K+ channel, K+ channel closes causing depolarization
- 1st gen vs 2nd gen
+2nd gen requires a lower dose for same efficacy - increased CV mortality
thiazolidinediones (TZDs)
- MOA: decrease insulin resistance (PPAR mediated)
+drug binds to receptors and increases likelihood of cellular responsiveness to insulin
+increases insulin signal transduction - risk of MI, increased with insulin and nitrates
- Avandia-Rosiglitazone Medicine Access Program - only certain physicians had access to Rx it
*PPAR: peroxisome proliferator-activated receptor
acarbose
- drug class: alpha-glucosidase inhibitor
- MOA: blocks digestion of complex carbs
- beneficial in pre-diabetics
- SE: GI upset
+flatulence
+diarrhea
+bd pain
bile acid binding resin
- large cation exchange resins - not absorbed
- also good for dyslipidemia
-
binds bile acids - prevents reabsorption
+must be taken with food - GI upset
amylin
- amylin is released by beta cells
+suppresses glucagon release - decreases circulating glucose
- concomitant with insulin
semaglutide (ozempic)
- drug class: GLP-1 agonist//incretin-based therapuetic agent
- GLP-1 agonism:
+stimulates insulin release
+inhibits glucagon release
+both leads to effect of lowering blood glucose
pancreatic CA risk
GLP: gluagon-like peptide
sitagliptin (januvia)
- drug class: DPP-4 antagonist
- MOA: blocks DPP-4, which increases GLP-1 agonism and incretin hormones leading to decreased glucose
DPP-4: dipeptidyl peptidase-4
gliflozins
AKA SGLT-2 inhibitors
- MOA: prevents glucose reaborption in PCT
- SE: glucosuria
+osmotic diuretic - BP reduction
+wt. loss
+dehydration - ex) Jardiance, Invokana
statins
- MOA: HMG-CoA reductase inhibitors
- decreases overall cellular cholesterol synthesis
- increases LDL receptors
+scavenge LDL from blood
+major effect on liver (raises liver enzymes) - modest decrease in triglycerides
- small increase in HDL
- SE/tox: muscle pain/increased CK
niacin
vitamin B3
- decreases VLDL and LDL (reduces VLDL secretion from liver)
- increases HDL
- incorporated into NAD - ETC glycolysis/energy producing pathway
- dosing 2-6g daily
- main tox: flushing
- other tox: pruritic, dry skin, nausea, abd pain, elevation of liver enzymes
gemfibrozil
- drug class: fibrate
- MOA: decreases VLDL, moderate decrease in LDL
- tox: GI upset (rare)
- increaes lipolysis in the liver (PPAR mediated)
BABR
bile acid binding resins
- MOA: cationic bile acid binding (positively charged drug binds to negatively charged bile)
- prevents reuptake from the bile
- SE: constipation, bloating, steatorrhea, oral drug absorption impairment
ezetimibe
- drug class: absorption inhibitors
- MOA: inhibits cholesterol absorption; NPCL-1 antagonist
- tox: possible hepatic, ENHANCE trial (reduced LDL, promoted arterial wall thickening?)
evolocumab
- drug class: PCSK9 inhibitor
- MOA:
+inhibits protein PCSK9 (this protein normally binds to LDL + LDL receptors on the liver and promotes their degradation)
+by PCSK9 binding to PCSK9, LDL can bind to LDL-Rs & the number of LDL receptors are increased and available to clear cholesterol from the blood, therefore, lowering LDL levels - these drugs are not usually given by themselves - they’re usually given with statins
- statins upregulate serum PCSK9 levels
celecoxib
- drug class: COX-2 selective inhibitor
- less effects on “housekeeping” COX-1
+**fewer GI effects, **no impact on PLT aggregation, absorption increased by food - indication: arthritis
- effects: analgesia, antipyretic, anti-inflammatory
- adverse effects: CV BB warning (inhibition of PGI2 production - pro clot!)
- is a sulfonamide - allergy warning
(COX-2»_space;»»> COX-1)
meloxicam
- drug class: COX-2 inhibitor»_space; COX-1
- not as selective as other COXIBs
- fewer GI effects
- tox effects similar to other NSAIDs
diclofenac (voltaren)
- drug class: non-selective COX inhibitor
- anti-inflammatory, analgesic, antipyretic
- 20% of pts have adverse GI effects (decreased with misoprostol AKA cytotec)
- also comes as a topical gel
ibuprofen
- drug class: NSAID (non-selective COX inhibitor)
- less GI upset than ASA (equal in efficacy as an anti-inflammatory/analgesic drug)
- OTC
- PO, cream, gel, IV
- adverse effects: like all other NSAIDs
+agranulocytosis and aplastic anemia is rare
indomethacin
- potent COX inhibitor (inhibits COX and LOX synthesis)
- MOA: may also inhibit PLA/PLC
- reduces PMN migration
- decrease T&B cell proliferation
- indications: rheumatism, gout, patent ductus arteriosus - open duct that allows arterial/venous blood to mix between the aorta/PA
ketorolac (toradol)
- drug class: NSAID (COX1=COX2 inhibition)
- indication: post-op pain, ER/sports medicine (IV/PO/IM/IN)
- short-term use
- NSAID but primarily used for pain
- can be used in conjunction with opioids
- typically use 25-50% lower dose of opioids
acetaminophen
- drug class: NOT AN NSAID//selective COX-2 inhibitor in the CNS
- weak PG inhibitor in peripheral tissues
- PO or PR (newer IV formulation)
- metabolized by hepatic enzymes (toxic to both kidneys/liver)
- it does not affect inflammation
- while it is an analgesic and an antipyretic, it doesn’t inhibit the COX enzymes in peripheral tissues to the same extent as NSAIDs, which limits its anti-inflammatory effects
- adverse effects:
+mild increase in hepatic enzymes
+larger doses: dizziness, excitement, disorientation
+FATAL: 15 grams, hepatotoxicity, acute renal tubular necrosis
glucocorticoids
- bind to glucocorticoid response elements (which increase gene expression that decreases inflammation)
- annexin-1 (lipocortin-1) is increased
+this suppresses PLA-2; also inhibits leukocyte response - SLPI is increased (secretory luekoprotease inhibitor)
- IL-10 is increased (decreases WBCs rushing to area)
- INh-NFK B is decreased (this is pro-inflammatory, so inhibiting this makes it anti-inflammatory)
morphine
- phenanthrene structure
- strong opioid
dilaudid
- phenanthrene structure
- 5x more potent than morphine
- strong opioid
codeine
- phenanthrene structure
- 1/10th as potent as morphine
- moderate agonist
oxycodone
- phenanthrene structure
- more effective as a combination med
- 2x more potent than morphine
- moderate agonist