Drug MOA/SE/Use Flashcards
(259 cards)
Zidovudine MOA
thymidine analogue (w/ 3’-azido) prevents phosphodiester linkage, inhibiting RT & viral replication
Zidovudine Resistance
common in newly infected pts & those previously Tx w/ this drug
Zidovudine S/E
Extreme ANEMIA & NEUTROPENIA in compromised bone marrow function pts;
GI (n/v, diarrhea, hepatitis)
HEMA (anemia, granulocytopenia, thrombocytopenia, bone marrow toxicity)
Zidovudine can be used w/ all other NRTIs except?
Stavudine
Which pt condition warrants extreme caution when using Zidovudine?
Bone marrow compromised pts
HIV+ pregnant females using which drug during wks 14-34 along + infants until 6 wks, can reduce transmission rates to 8%
Zidovudine
Didanosine MOA
ideoxyinosine, w/ a 3’-H instead of a 3’-OH; Activation to ddATP, competitive inhibition of RT enzyme
Didanosine S/E
Peripheral neuropathy, potentially fatal pancreatitis, GI disturbances
What limits Didanosine?
Lowered absorption d/t gastric pH or food
Lamivudine MOA
3’-Carbon replaced by 3’-Sulfur; Competitive inhibition of RT
Lamivudine S/E
Less cellular toxicity - but less potent than Zidovudine; Related to Didanosine, but NO risk for peripheral neuropathy
What limits Lamivudine?
Rapid RESISTANCE if on monotherapy!
Which NRTIs have action against HBV?
Lamivudine & Emtricitabine & Tenofovir
Emtricitabine MOA
5’-Fluorinated derivative of Lamivudine (3’-Sulfur); Competitive inhibition of RT
Emtricitabine S/E
BEST TOLERATED! Hyperpigmentation of palms & soles
Abacavir MOA
Nucleoside Analog - Competitive inhibition of RT
Abacavir S/E
3-9% Severe HSN rxn - rash, fever, malaise
Respiratory or GI Sx
Preferred Tx for Tx-naive patients
Epzicom & Truvada combination drugs
Epzicom
Abacavir/Lamivudine combination pill
Truvada
Emtricitabine/Tenofovir combination pill
Tenofovir MOA
NucleoTide analog - Competitive inhibition of RT
Tenofovir S/E
n/v, diarrhea, renal toxicity
Tenofovir Use
Active against HBV & NRTI-RESISTANT strains
Limitations of Efavirenz
contraindicated during pregnancy - neural tube defects