Pharm Flashcards
(84 cards)
Km is
inversely related to the affinity
Vmax is
Directly proportional to enzyme concentration
Increase y-intercept on Lineweaver-Burk plot means
Decrease in Vmax
Competitive inhibiotrs do what on a Lineweaver-Burk plot
Bring Km closer to 0
No change to Vmax (y-intercept)
Bioavailability (F)=
AUCo / AUCIV
Volume of distribution (Vd) =
Dose / [P]
Drug with low Vd found in
Blood
Drug with medium Vd found in
ECF
Drug with High Vd found in
All tissues
t1/2=
[0.7 X Vd] / Cl
Cl=
Rate of elimination / [P]
Vd X K
Loading dose=
[Cp x Vd] / F
Maintenance dose=
[Cp x Cl x τ] / F
Zero PEAs for me
Drugs with zero order of elimination
- Phenytoin
- Ethanol
- Asprin
Phase 1 drug metabolism
- Reduction
- Oxidation
- Hydrolysis with P-450
Phase 2 drug metabolism
- Glucuronidation
- Acetylation
- Sulfation
Efficacy is
Maximal effect a drug can produce
Potency is
Amount of drug needed for a given effect
α1 major functions
- Gq
- Increase vascular smooth muscle contraction
- Increase pupillary dilator muslce contraction (Mydriasis)
- Increase intestinal and bladder sphincter muscle contraction
α2 major function
- Gi
- Decrease symathetic outflow
- Decrease insulin release
- Decrease lipolysis
- Increase Platelet aggregation
Hemicholinium action
Inhibits Choline uptake
Vesamicol action
Inhibits ACh storage
Botulinum action
Inhibit ACh release
Metyrosine action
Inhibit formation of DOPA from Tyrosine