Exam 4 Drugs Flashcards

(127 cards)

1
Q

heparin

A
  • 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
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2
Q

lmw heparin

A
  • 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)
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3
Q

fondaparinux (arixtra)

A
  • 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
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4
Q

protamine sulfate

A

* 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

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5
Q

leprudin (hirudin) or bivalirudin (angiomax)

A
  • drug class: direct thrombin inhibitors
  • MOA: bind to both active and subtrate recognition sites of thrombin; prevents fibrin clot from forming
  • hirudin - leech therapy
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6
Q

argatroban, dabigatran (pradaxa)

A
  • drug class: direct thrombin inhibtor
  • MOA: binds only to thrombin active sites (from biological sources); prevents fibrin clot from forming
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7
Q

warfarin

A
  • 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
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8
Q

rivaroxaban (xarelto), apixaban (eliquis)

A
  • 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
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9
Q

tissue plasminogen activator (tPA)

A
  • 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
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10
Q

streptokinase

A
  • drug class: fibrinolytic
  • synthesized by Streptococci
  • MOA: binds to plasminogen to activate it to promote fibrinolysis
  • indication: MI, PE
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11
Q

urokinase

A
  • drug class: fibrinolytic
  • synthesized by the kidney
  • MOA: lyses the thrombus from within
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12
Q

ASA

A
  • 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

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13
Q

clopidogrel (plavix), ticlopidine (ticlid)

A
  • 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
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14
Q

abiciximab

A
  • 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)
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15
Q

vitamin k

A

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

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16
Q

fresh frozen plasma (FFP)

A

drug class: factor replenishment
target: multiple
result: normal clotting cascade
indications: hemophilia

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17
Q

desmopressin

A
  • increased factor VIII activity
  • indications: mild hemophilia A, von-willebrand disease
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18
Q

aminocaproic acid

A

drug class: fibrinolytic inhibitor
MOA: competitively inhibits plasminogen activation
result: stablized clot
indication: post-op

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19
Q

tranexamic acid (TXA)

A

drug class: fibrinolytic inhibitor
MOA: inhibits plasminogen conversion to plasmin
indication: trauma, heavy menstrual bleeding, postpartum, epistaxis
decreased risk of death in major bleeding

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20
Q

lispro, aspart, glulisine

A

rapid acting insulins

bolus insulin

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21
Q

novolin, humulin

A

short acting (regular) insulin

acts fast; leaves fast (longer acting than RA)

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22
Q

NPH

neutral protamine Hagedorn

A

intermediate acting

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23
Q

glargine, detemir

A

long acting insulin

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24
Q

metformin

A
  • drug class: biguanide (two guanine molecules)
  • fist line therapy for NIDDM (type II)
  • MOA: **reduces hepatic glucose production **
  • 500 mg prandial
  • GI toxicities
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25
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
26
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
27
acarbose
* drug class: alpha-glucosidase inhibitor * MOA: blocks digestion of complex carbs * beneficial in pre-diabetics * SE: GI upset +**flatulence** +diarrhea +bd pain
28
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
29
amylin
* amylin is **released by beta cells** +**suppresses glucagon release** * decreases circulating glucose * concomitant with insulin
30
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
31
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
32
gliflozins | AKA SGLT-2 inhibitors
* MOA: **prevents glucose reaborption** in PCT * SE: **glucosuria** +osmotic diuretic - BP reduction +wt. loss +dehydration * ex) Jardiance, Invokana
33
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
34
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
35
gemfibrozil
* drug class: fibrate * MOA: decreases VLDL, moderate decrease in LDL * tox: GI upset (rare) * increaes lipolysis in the liver (PPAR mediated)
36
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
37
ezetimibe
* drug class: absorption inhibitors * MOA: **inhibits cholesterol absorption; NPCL-1 antagonist** * tox: possible hepatic, ENHANCE trial (reduced LDL, promoted arterial wall thickening?)
38
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
39
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 >>>>>>> COX-1)
40
meloxicam
* drug class: COX-2 inhibitor >> COX-1 * not as selective as other COXIBs * fewer GI effects * tox effects similar to other NSAIDs
41
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
42
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
43
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
44
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
45
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
46
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)
47
morphine
* phenanthrene structure * **strong opioid**
48
dilaudid
* phenanthrene structure * **5x more potent than morphine** * strong opioid
49
codeine
* phenanthrene structure * 1/10th as potent as morphine * moderate agonist
50
oxycodone
* phenanthrene structure * more effective as a combination med * 2x more potent than morphine * moderate agonist
51
percadan/percocet
* oxy + tylenol = percocet * oxy + ASA = percodan * moderate agonists
52
methadone
* phenylheptylamine structure * 10x more potent than morphine * strong opioid agonist * indications: chronic pain (with morphine tolerance) * "less problematic drug" - typically used for people with drug abuse * duration of analgesia: 4-6 hours * long half-life (25-50 hrs) * CYP3A4 metabolism
53
fentanyl
* phenylpiperidine structure * strong opioid agonist * **100x more potent than morphine** * *carfentanil: 10,000x more potent* (drugs laced with this can be fatal)
54
meperidine (demerol)
* phenylpiperidine structure * strong opioid agonist * **antimuscarinic effects: tachycardia** * negative inotrope * can potentiate seizures to someone who is already predisposed * indications: **post-op shivering** +**increased kappa opioid receptor agonism; some serotinergic effects**
55
tramadol
* phenylpiperidine structure * moderate agonist * also has SNRI activity * racemic mixture * *safer alternative
56
buprenorphine (buprenex)
* indication: **opioid abuse/dependency** * partial agonist
57
butorphanol (stadol)
* partial agonist * indication: post-op shivering
58
dextromethorphan
* indication: cough * effect: antisussive
59
naloxone
* derivative of morphine * opioid reversal agent (1-3 mins) * short duration; effects may return * **little effect in absence of agonist**
60
naltrexone
* derivative of morphine * indication: opioid & ETOH abuse
61
naloxegol
* derivative of morphine * **indication: treatment of opioid induced constipation** * **only goes into enteric nervous system** * suppresses enteric response
62
PCN, ampicillin, amoxicillin
* beta-lactam abx * MOA: **inhibition of cell wall synthesis** +beta lactam ring attaches to enzymes that cross link peptidoglycans and prevent cell wall synthesis +these abx **inhibit cell wall synthesis** of bacterial cell walls by binding to and inactivating PCN binding proteins (PBPs) +this prevents the cross-linking of petidoglycan chains, **leading to cell lysis and death** * **PCN is a 5 ring structure** * effective against **gram (+)** bacteria and *some gram (-) cocci* * indications: strep throat, syphillis, meningitis * **adverse effects**: allergic reactions (rash to anaphylaxis), GI upset, neurotoxicity (rare) | prototype: PCN G
63
cephalosporin
* beta-lactam abx * **inhibits cell wall synthesis** by binding to and inactivating PCBs * prevents cross-linking of peptidoglycan chains * cell lysis/death * **more resistant to beta-lactamase** * **broader spectrum than PCNs** and is used for respiratory tract infections, skin infections, & UTIs * **first generation: better gram (+) activity** * **adverse effects**: allergic rxns (cross-reactivity with PCNs), GI upset, and potential nephrotoxicity | prototype: cephalexin
64
vancomycin
* **MOA: inhibits cell wall synthesis** * * glycopeptide * useful for **gram (+) bacteria** * **resistant to beta-lactamase** * alternative to PCN resistant bacteria (MRSA) * *drug of last resort* * adverse reactions: 10% +irritant to tissues +ototoxicity +nephrotoxicity +chills/fever +"red neck" syndrome
65
polymyxin
* polypeptide antibiotic * MOA: disruption of cell membrane function +binds to phospholipids to cause cell death +**effective against gram-negative bacteria, which have an outer membrane**
66
daptomycin
* MOA: disruption of cell membrane function +binds to phospholipids to cause cell death * **better against gram (+) bacteria** * indications: skin infections, bacteremia
67
tetracyclines
* **MOA: inhibits protein synthesis** * bacteriostatic * pharmacoK: readily absorbed, widely distributed * **have the widest spectrum of activity on any abx** * *destroys normal intestinal microbiota, and often produce severe GI disorders (bone deposition disorder)* * can lead to c. diff * adverse reactions: +GI (N/V/D), bone, neurotoxicity, allergies, neprho/ototox
68
erythromycin
* drug class: macrolide * spectrum: gram + and - * this is the **prototype drug** * **MOA: inhibits protein synthesis**
69
azithromycin (zithromax)
* drug class: macrolide * **MOA: inhibits protein synthesis** * semi-synthetic derivative
70
neomycin
* MOA: inhibition of protein synthesis * can be topical
71
rifamycin
* **MOA: DNA/RNA synthesis** * binds to a bacterial **RNA polymerase**
72
ciprofloxacin (cipro)
* drug class: floroquinolone * MOA: **targets DNA/RNA synthesis** +inhibits DNA gyrase (bacterial) +this is an enzyme crucial for DNA synthesis * **excellent gram (-) activity** * **also good for gram (+)** * routes: PO, IV, opthalmic injections, * indications: respiratory, inhaled anthrax, tuberculosis, GI/abd infections, prostatitis, UTIs, STDs (chlamydia), bone/soft tissue/joint infections
73
sulfonamide
* MOA: inhibition of **folic acid synthesis** **structurally similar to PABA (precursor to folic acid production)** +competitively binds to block synthesis of folic acid * indications: pneumocystis, taxoplasmosis * often combined with trimethoprim to enhance effectiveness * combo: bactrim, septra * tox: +allergenic +may precipitate in urine +hematopoietic distrubances
74
trimethoprim
* MOA: inhibition of **folic acid synthesis** +inhibits the enzyme **dihydrofolate reductase** +blocks bacterial growth * often combined with trimethoprim to enhance effectiveness * combo: bactrim, septra
75
ketoconazole
antifungal
76
lamisil
antifungal
77
hydroxychloroquine
antiprotozoal agent indication: malaria
78
metronidazole
antiprotozoal adverse effect: black, hairy tongue
79
niclosamide
indication: parasitic worms
80
ivermectin
indication: parasitic worms
81
permethrin
indication: parasitic worms
82
acyclovir
* MOA: * inhibits viral DNA synthesis * converted into acyclovir triphosphate inside infected cells, then competes with **deoxyguanosine triphosphate** for incorporation into viral DNA * once incorporated, acyclovir triphosphate acts as a **chain terminator** - it lacks a 3'-OH group, preventing further elongation of the DNA chain * indications: HSV1, HSV2, VZV infections * safe in pregnant women, can reduce shedding in c-section rate when given in last trimester of pregnancy
83
azidothymidine (AZT)
* drug class: antiretroviral nucleoside/nucleotide analog * MOA: +combined with other antivirals in HAART (highly active antiretroviral therapy) +**inhibitor of reverse transcriptase**
84
lamivudine
* MOA: inhibits HBV DNA polymerase and HIV reverse transcriptase
85
cabotegrovir | AKA PrEP
* Pre-exposure preventative * blocks integration
86
interferon
* naturally occuring in human cells * used with some success in preventing and treating viral infections
87
oseltamivir phosphate (tamiflu)
* influenza antiviral * early treatment of flu (FDA approved)
88
zanamivir (relenza)
* must be taken BEFORE sx occur * not rec for ppl with **asthma or COPD**
89
baloxivir marboxil (xofluza)
* polymerase inhibitor * not rec for pregnant women, breastfeeding mothers, outpatients with progressive or complicated illness or hospitalized pts * may reduce duration of flu by 1 day * **one-time pill dose**
90
paxlovid
* COVID tx * 2 antivirals, emergency use authorization (PO)
91
remdesivir
* FDA approved COVID tx * chain terminator * IV
92
COVID MABs
* COVID tx * (3) * block covid entry into cells * IV
93
dexamethasone
* COVID tx * cytokines
94
levodopa/carbidopa
* L-isomer of dopamine * crosses the BBB (dopamine does not) * improved uptake with carbidopa and COMT inhibitors (tolcapone) * decreased toxicity (hallucinations) with pimavanserin (nuplazid) * **MOA: restores dopa levels**
95
pimavanserin (nuplazid)
* drug class: a-typical antipsychotic * inverse agonist ast 5-HT2A (visual cortex) * interacts with the thalamus, which interacts with the substantia nigra * combats hallucinations associated with parkinson's
96
pramipexole
* drug class: dopamine receptor agonist * less effective than L-Dopa * decreased SE
97
selegeline
* drug class: MAO-B antagonist * minor effects alone * increases dopamine levels
98
tolcapone
* drug class: COMT inhibitor * catecholamines are inactivated by oral admin * catecholamines are inactivated by catechol-O-methyltransferase (COMT) * by inhibiting COMT, tolcapone **increases circulating dopamine**
99
apomorphine
* drug class: dopamine agonist * useful to treat "off" periods of parkinson's * decreases akinesia symptoms
100
baclofen
* drug class: muscle relaxant * indication: cerebral palsy * MOA: relaxes muscle movements associated with CP (hyper/hypotonia)
101
tetrabenazine
* drug class: VMAT2-inhibitor * MOA: depletes dopamine (dopamine stimulates ACh receptors, leading to **Chorea associated with Huntington's Disease)**
102
haloperidol (haldol)
* drug class: antipsychotic * MOA: dopamine receptor blocker * treats Chorea symptoms associated with Huntington's Disease
103
riluzole
* drug class: sodium channel blocker * MOA: blocks sodium channel binding * extends quality of life in **ALS** patients
104
tacrine
* drug class: AChE-inhibitor * MOA: inhibits the breakdown of AChE in the synapse to help with **Alzheimer's Disease** sx
105
ASA OD treatment
* activated charcoal * IV fluids * hemodialysis
106
memantine
* drug class: NMDA-R antagonist * useful in the treatment of **Alzheimer's Disease**
107
echinacea
* sitmulation of immune system, anti-inflammatory
108
garlic
* HMG CoA reductase inhibitor * "inhibits cholesterol synthesis"
109
ginko
* improved blood flow * free radical scavenger * "dementia: memory"
110
st. john's wort
* antidepressant * **CYP450** * not to be used with **MAO-i's and SSRI's**
111
ginseng
* memory * immune system * analgesia
112
milk thistle
* reduction in hepatotoxicity
113
saw palmetto
* BPH
114
kava kava
* anxiety, muscle relaxant, sedative
115
kombucha
* BP * CA * GI health
116
aloe
* laxative * burn ointment
117
black cohosh
* menstrual discomfort
118
cyclophosphamide
drug class: alkylating agent - **nitrogen mustard** * most common alkylating agent * MOA: 1. forms highly reactive carbonium ion 2. transfers alkyl groups to nucleophilic sites on DNA bases 3. results in: +cross linkage +abnormal base pairing (cell cycle arrests) +DNA strand breakage **+decreased cell proliferation** *also damages RNA and proteins*
119
chlorambucil
* least toxic nitrogen mustard alkylating agent
120
nitrosoureas
* alkylating agent that crosses BBB (useful in brain tumors)
121
cisplatin
* highly bound to plasma proteins * concentrates in kidney, intestine, and testes * poorly penetrates BBB * slowly excreted in urine * indications: +testicular CA (85-95%) +ovarian CA +other solid tumors: lung, esophagus, gastric * MOA: 1. cisplatin enters cell 2. Cl- ions released 3. forms highly reactive platinum (Pt) complexes 4. instra strand/interstrand x-linkage 5. DNA damage 6. inhibits cell proliferation * adverse effects: emesis, nephrotox, peripheral neuropathy, ototox
122
methotrexate
* anti-metabolite drug * inhibits dihydrofolate reductase (DHFR) and interferes with **DNA/RNA synthesis** by inhibiting **folate synthesis** * cytotoxic actions: +predominant on bone marrow +ulceration of intestinal mucosa +crosses placenta intereferes with embryogenesis (**fetal malformations and death**) * immunosuppresive actions: +prevents clonal expansion of B & T lymphocytes * anti-inflammatory action +interferes with release of inflammatory cytokines
123
antimetabolites
* 6-mercaptopurine (6-MP) * 5-fluorouracil (5-FU)
124
vincristine, paclitaxel (taxol)
antineoplastic: **plant based**
125
dactinomycin, doxorubicin, bleomycin
antineoplastic: **anti-tumor abx**
126
corticosteroids, tamoxifen, fulvestrant
antineoplastics: **hormonal agents**
127
Imatinib, Trastuzuman, Rituximab
antineoplastics: **miscellanous -MABs & -ibs (growth factor inhibitors)**