Pharmacology Flashcards
(246 cards)
Define pharmacokinetics
Study of drug movement in the body/ effect of body on the drug
Define side effects
Unwanted effects of the therapeutic doses
Define agonist vs antagonist
Agonist: have affinity and maximal efficacy
Antagonist: have affinity and no maximal efficacy
Define clearance
Measure of the body’s ability to excrete the drug
Optimal effect exerted over narrow range of plasma drug concentration is …..
Therapeutic window phenomenon
Define drug efficacy vs drug potency
Drug efficacy: maximal effect that a drug may elicit
Drug potency : amount of drug required to produce a certain response
Define bioavailability
Fraction of the drug that reaches the blood.
Microsomal enzyme inducers (3)
Phenytoin
Phenobarbitone
Rifampicin
Drugs showing high first pass metabolism are (3)
Lignocaine
Propranolol
Salbutamol
Define first pass elimination
Metabolism of drug in liver,intestine/portal blood. + Excretion of drug into bile
T1/2 can determine (4)
Elimination time
Steady state plasma conc
Dosing rate
Maintainance dose
Egs of prodrugs (4)
Enalapril
Sulindac
Ticlopidine
Clopidogrel
Difference between zero order and first order kinetics
Zero order First order
1. Constant amount Constant fraction
2. t1/2 variable t1/2 constant
3. Rate of elimination Rate of elimination
independent dependent
Phases of clinical trials and it’s determination
Phase 1: Human pharmacology & safety
Phase 2: Efficacy, dose ranging.
Phase 3: therapeutic confirming
Phase 4: post marketing surveillance
Drugs causing osteoporosis (2)
- Steroid
- Heparin
Drugs with low safety margin (3)
Lithium
Aminoglycosides
Digoxin
Drugs causing hirsuitism (2)
Minoxidil
Phenytoin
Drugs causing extra pyramidal side effects (2)
Haloperidol
Levodopa
Hemolysis in G6PD deficiency caused by …(4)
Dapsone
Primaquine
Sulfonamides
Nitrofurantoin
Drug deposited in retina
Drug deposited in muscle
Chloroquine
Digoxin
Drugs causing hepatitis (4)
Halothane
Rifampin
INH
Pyrazinamide
Drugs causing intrahepatic cholestasis (2)
Phenothiazines
TCA
Egs of hepatotoxins (2)
CCL4
Paracetamol
Drug metabolised in liver (4)
Phenytoin
Erythromycin
Cimetidine
Diazepam