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USMLE Pharma 1
USMLE Pharma 1
27
Medical
Graduate
05/14/2011

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Term
finasteride
Definition

5-α-reductase inhibitor

blocks testosterone from becoming dihydrotestosterone

Tx. BPH, male pattern baldness

Term
Terbinafine
Definition

oral anti-fungal 

squalene epoxidase inhibitor

Tx. tinea capitis (topical antifungal doesn't penitrate

Term
Colchicine
Definition

inhibits microtubular polymerization

prevents aggregation of MT subunits

disrupts membrane-dependent functions like chemotaxis and phagocytosis of PMNs.

Also used for karyotyping

Used to treat gout

Term
Trimethoprim
Definition

block bacterial dihydrofolate reductase

blocks folic acid synthesis - needed for pyrimidine synthesis

is an antibiotic

may interact w/ human enzymes

Term
Methotrexate
Definition

Blocks human dihydrofolate reductase

inhibits tetrahydrofolate production from dihydrofolate

THF needed in pyrimidine synthesis

is a cancer chemotherapy drug

Term
Pyrimethamine
Definition

blocks parasitic dihydrofolate reductase, inhibiting tetrahydrofolate from dihydrofolate - prevents pyrimidine synthesis.

Treats malaria

Term
Metronidazole
Definition
binds to DNA causing an unraveling of the helix, breaks the strands, thereby inhibiting protein synthesis and the cell dies.
Term

Imipenem

-also what drug is commonly given with this and why?

Definition

blocks Peptidoglycan synthesis last step in bacteria by binding to the penicillin binding proteins

Cilastatin prevents renal metabolism of this drug by inhibiting dehydropeptidase on renal tube brush border

Term
Bacitracin
Definition
Blocks mucopeptide transfer into cell wall, blocking bacterial wall synthesis.
Term
Metronidazole
Definition
Treats giardia, H. pylori, amebiasis, and trichomoniasis
Term
Mebendazole
Definition
treats helmenths such as Ascaris, Ancylostoma, and Enterobius by acting on microtubules
Term
Albendazole
Definition
treats cestode tapeworm Echinococcus granulosis
Term
Mesna, or "2-mercaptoethanesulfonate"
Definition
What can you give with cyclophosphamide or ifosfamide to prevent hemorrhagic cystitis?
Term
Ondansetron
Definition

inhibits serotonin (5-HT) receptors 

Tx nausea and vomiting

Term
Pyridoxine (B6) in the setting of renal stones - why?
Definition
it decreases endogenous oxalate production decreasing the rate of calcium stone formation in urinary tract
Term
Acetazolamide
Definition
Diuretic via blocking carbonic anhydrase, preventing HCO3 resorption - acidifies urine and alkalinizes the blood.
Term
Epleronone or spironolactone
Definition

aldosterone inhibitors which reduce sodium and water reabsorption in kidneys.  

**ONLY DIURETIC TYPE TO INCREASE SURVIVAL IN CONGESTIVE HEART FAIL

Term
SHIPP - Sulfalazine, Hydralazine, Isoniazide, Phenytoin, and Procainamide - unique side effect and metabolism of these drugs
Definition

Can cause drug induced lupus (anti-histone antibodies)

the two most high risk (second and last listed) Metabolized by acetylation in Liver

Term
Griseofulvin
Definition
anti fungal via microtubule action
Term
Vincristine / Vinblastine
Definition
Cancer chemo - acts on microtubules
Term
Paclitaxel
Definition

Cancer chemo, breast cancer

acts on microtubules

Term
Phenoxybenzamine
Definition
non-competitive irreversable alpha 1 and alpha 2 antagonist
Term
Tricyclic overdose typically develops what type of symptoms?
Definition
Anticholinergic symptoms, cardiac conduction issues.
Term
Para-aminobenzoic acid (PABA) sunscreen blocks which type(s) of UV rays?
Definition

blocks UVB only - the major cause of sun skin damage

does not block UVA I or II light

Term
Phentolamine
Definition

non-specific alpha adrenergic block.  Vasodilates via alpha 1 block (may cause reflex tachycardia due to drop in BP)

but the alpha 2 inhibition may increase sympathetic tone (also causes tachycardia)

Term
Neostigmine
Definition
acetylcholinesterase inhibitor - competitive
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