heme/GU/renal Flashcards
what helps increase the absorption of iron? what can decrease absorption?
gastric acid and ascorbic acid; milk and tea–take between meals
foods with high iron
Total cereal--most! Grape-nuts cereal --most! Instant Cream of Wheat Instant plain oatmeal Wheat germ Broccoli Baked potato Raw tofu Lentils Beef chuck
recommended iron per day
200 mg of elemental iron per day in 2-3 divided doses (better tolerated) on an empty stomach
what important factor do you have to look at to determine amount of iron in iron supplements?
the elemental iron %–the amount of iron patient gets is not equal to mg of dose
AE of iron supplementation
GI – discoloration of feces (dark), abdominal pain, heartburn, constipation, N/V
if iron supplementation intolerable how do you take it?
Take iron with meals
• Decrease total daily dose to 110-120 mg elemental Fe
modest reticulocytosis after Fe therapy should occur in how many days? how much should hgb increase?
7-10; hgb should increase about 1g/dL per week
how long should Fe therapy be continued after anemia resolves to replete iron stores? what are some exceptions?
3-6 months; exceptions if acute bleed, may only have to continue for 1 month after anemia resolves, or if chronic negative values (chronic heavy menstruation or malabsorption) requires low maintenance dose qd
indications for parenteral iron therapy
Evidence of malabsorption
Intolerance of oral iron
Long-term adherence is a problem
Chronic HD or CAPD
when giving parenteral iron, you should give what first b/c of the risk of anaphylaxis?
a test dose of 25 mg IM or IV with epi, diphenhydramine and corticosteroids on hand. watch for 1 hour before giving rest of dose
RFs for VB12 deficiency anemia
vegan diet, older age, women, decreased absorption (prolonged h2ra or PPI, metformin?), inadequate utilization
PO dose of B12
1-2 mg po qday
if someone has neuro sx, whats the best way to give their B12 for anemia? what’s the dose?
Parenteral Vitamin B12 Therapy (IM or deep subcutaneous)
Cyanocobalamin 1000 mcg qd for 1 week initially to saturate B12 stores and resolve clinical
manifestations, then to 1000 mcg q week until Hgb/Hct normalizes, then 1000 mcg q month until normalization of sx and hematologic indices;
can then convert to oral (first dose on due date for next injection)
how many days until reticulocystosis in new B12 therapy for anemia?
2-5 days
AE of B12 thearpy
Hyperuricemia (caution gout)
Fluid retention (more likely in pt with compromised CV status)
Hypokalemia (check K)
Anaphylaxis with parenteral administration
sources of folic acid in diet
fresh fruits and veggies, yeast, mushrooms, animal organs
rec’d amount of folic acid in non pregnant females, pregnant, lactatign
400 mcg/day in non-pregnant females, 600 mcg/day in pg females, 500 mcg/day lactating females
dose of folic acid
1 mg po qd x 4 months (if underlying cause is identified and corrected)
dose of folic acid in pregancy
400-1000 mcg qd prior to conception and during pregnancy
4 mg/day recommended for high risk pregnancies
when is a low maintenance dose of folic acid indicated?
Low-dose folate therapy (500 mcg po qd) can be used for anticonvulsant-induced anemia to avoid
discontinuation of the AED (may PHT levels)
tx of anemia of chronic disease
Treat the underlying disorder and correct reversible causes of anemia
Red cell transfusions
Erythropoietin stimulating agents (ESA)
If endogenous EPO is high (>150), may not respond to exogenous EPO
Check Hgb q 2 wks: > 0.5 g Hgb predicts + response; no change in Hgb, ↑ EPO dose
Watch serum iron levels carefully and give Fe supplements if needed
For chemotherapy-induced anemia, ESA use restricted to anemia without a curative intent due to
mortality
names of drugs for anemia of chronic renal failure
Epoetin alpha (Epogen, procrit) Darbepoetin alpha (Aranesp)
what is the black box warning for epo agents?
greater risks of death, serious adverse
cardiovascular reactions, and stroke when administered erythropoiesis-stimulating agents (ESAs) to target a hemoglobin level of greater than 11 g/dL.
aka use smallest dose for as little as possible
Current FDA Recommendations for Use in Patients with CKD (Pharmacist’s Letter, 8/11)
Start treatment only when Hgb is
tx for OI in HIV: candida
propylaxis
tx
primary prophylaxis not indicated
tx: fluconazole
tx for OI in HIV: PCP
propylaxis
tx
I° Prophylaxis with SMX/TMP initiated at CD4
tx for OI in HIV: toxoplasmosis
propylaxis
tx
I°: SMX/TMP- TOXO IgG seropositives with CD4+ 200 tx: Sulfadiazine 1000-1500 mg qid \+ Pyrimethamine* 200 mg x 1, then 50-75 mg qd
tx for OI in HIV:cryptococcal infection
propylaxis
tx
primary: not indicated
II°: fluconazole, d/c after ≥3, on ARVTx, and sustained CD4>100
tx: amphotericin B
tx for OI in HIV: CMV infection
propylaxis
tx
II° Prophylaxis continued until CD4 count >100 cells/mL sustained for greater than 3-6 months on ARVTx
tx: Ganciclovir or Valganciclovir
tx for OI in HIV: Mycobacterium Avium Intercellulare
propylaxis
tx
primary: I°: Azithromycin at CD4+ 3m on ARVTx, and sustained CD4>100
tx; Azithromycin
600 mg qd
+ Ethambutol
15-20 mg/kg/d
± Rifabutin 300 mg qd (different dosing with ARVT)
12m course
entry inhibitor MOAs and AEs: enfuvirtide and maraviroc
enfuvirtide blocks viral attachment to GP41; AE ISR, bacterial pneumonia
maraviroc binds to co receptor and prevents conformation change required for virus entry
AE: fever, rash, increased LFTs
both have poor tolerance and aren’t used much
NRTIs: combo pills available
Lamivudine-Abacavir (EPZICOM) and Emtricitabine-Tenofovir (TRUVADA)
HIV med with vivid dreams
Efavirenz
NNRTI that can prolong qt interval; what is CI with this drug?
rilpivirine; CI: proton pump inhibitors
Trade names of these drugs and what class are they in?
Efavirenz (sustiva) and rilpivirine (Edurant)
what drug class are these in?
Enfuvirtide
Maraviroc
entry inhibitors
what drug class are these in? Abacavir** not renal Lamavudine** Emtricitabine* Tenofovir* Zidovudine Didanosine Stavudine
NRTIs
what drug class are these in?
Raltegravir
Elvitegravir
Dolutegravir
integrase inhibitors
what drug class are these in? Atazanavir Darunavir Lopinavir/Ritonavir Fosamprenavir Ritonavir Saquinavir Nelfinavir Tipranavir Indinavir
protease inhibitors
what drug class are these in? Efavirenz Nevirapine Etravirine Rilpivirine Delavirdine
NNRTIs
Are there Major Drug Interactions with NON- Nucleoside Reverse Transcriptase Inhibitors (NNRTIs)?
yes
Are there Major Drug Interactions with Nucleoside Reverse Transcriptase Inhibitors (NRTIs)?
no not really, all renally cleared except abacavir
which AE go with which INSTI?
• AE: well tolerated, ↑lipids, eosinophilia, increased BGs and ALT, myopathy
• AE: well tolerated, N/D
• AEs: well tolerated, HA, hyperglycemia, elevated lipase and transaminases
- AE: well tolerated, ↑lipids, eosinophilia, increased BGs and ALT, myopathy: RALTEGRAVIR
- AE: well tolerated, N/D : elvitegravir
- AEs: well tolerated, HA, hyperglycemia, elevated lipase and transaminases: dolutegravir
what PK booster is commonly added to elvitegravir and why? what are its AE?
cobicistat: enhances by inhibiting enzyme pathway that metabolizes elvitegravir
• AE: nausea, loose stools, ↑Scr, cholesterol & triglyceride elevation
booster used with PIs that is limited d/t bad AE. what are the AE?
ritonavir
AE: HA, N/V/D, taste perversion, elevated CK, hyperglycemia, elevated LFTs, HLD
Are there Major Drug Interactions with Protease Inhibitors (PIs)?
yes: CYP450
preferred PI and PK booster given with it
darunavir and ritonavir
NRTI+NRTI+INSTI examples
- Emtricitabine-Tenofovir (Truvada) + Raltegravir (isentress)
- Emtricitabine-Tenofovir (Truvada) +Dolutegravir (Tidivicay)
- If HLAB5701 negative: Abacavir-Lamivudine (Epzicom) + Dolutegravir (Tivicay) OR TRIUMEQ=all 3 in 1!
2 NRTIs + INSTI + booster examples
- Stribild QUAD PILL: Emtricitabine + Tenofovir (disoproxil fumarate (TDF) + Elvitegravir + Cobicistat
- Genvoya QUAD PILL: Emtricitabine +Tenofovir Alafenamide (TAF) + Elvitegravir +Cobicistat
2 NRTIs + PI + PK booster examples
- Emtricitabine-Tenofovir (Truvada) + Darunavir (Prezista) + Ritonavir (Norvir)
- Emtricitabine-Tenofovir (Truvada) + Darunavir-Cobicistat (Prezcobix)
- Some alternative combos replace Darunavir with Atazanavir
why do we adjust for renal function?
many drugs are cleared renally, if can’t be cleared drug concentrations and toxicity increases
how does decreased GFR affect serum creatinine?
increases serum creatinine
normal Scr
0.5 to 1.5 mg/dl
creatinine is metabolic by product of what?
creatine breakdown in muscle
what is biggest reason for increased creatine?
muscle mass